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Œ´‘èG Residence near high voltage facilities and risk of  cancer in Children.
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Œ‹‰Ê‚ÆŒ‹˜_F‚P‚X‚V‚O[‚P‚X‚W‚X”N‚É‚P‚XËˆÈ‰º‚ÅŠà‚Ɛf’f‚³‚ꂽƒP[ƒX‚Í‚P‚S‚OB@Šú‘Ò’l‚Í‚P‚S‚T‚ŁA‚n^‚d”ä‚Í‚OE‚X‚VB
@”’ŒŒ•aEƒŠƒ“ƒpŽîᇁA‘SŠà‚ł́A@—LˆÓ‚È’l‚Í‚È‚­A‘—“dü‚©‚ç‚Ì’ö“x‚Ì“dŽ¥”g‚Í–â‘è‚Í‚È‚¢B
i‚±‚ê‚æ‚è‹­‚¢Ž¥ê‚Ł@‚à–â‘è‚È‚¢‚Æ‚Í‚±‚ÌŒ¤‹†Œ‹‰Ê‚©‚ç‚ÍŒ¾‚¦‚È‚¢Bj

@’A‚µ@‚Q‚‚fˆÈã‚Ì–\˜I‚ðŽó‚¯‚Ä‚¢‚é’jŽ™‚Ì”]Žîᇂ¾‚¯‚́A‚n^‚d”䂪‚SE‚Qi95“M—Š‹æŠÔ‚Í‚PE‚S[‚XE‚Xj‚Å—LˆÓ‚ɍ‚‚¢‚ª@‚±‚ê‚Í‹ô‘R(chance finding)‚Å‚ ‚낤‚ÆŒ‹˜_B

Œ‹‰Ê@Œ´•¶‚Ì•\‚Q@ƒKƒ“‚ÆŽ¥ŠE‚Ì‚n^‚d”ä@@Š‡ŒÊ“à‚Í‚X‚T“M—Š‹æŠÔ

ƒKƒ“

Ž¥ŠE

’jŽ™

—Ž™

’j—Œv

”]Žîá‡

0.1-1.9mG

0.99 (0.62-1.5)

0.69 (0.36-1.2)

0.85 (0.59-1.2)

2mGˆÈã

4.2 (1.4 -9.9)

0.0 (0-3.8)

2.3 (0.75-5.4)

”’ŒŒ•a

0.1-1.9mG

0.77 (0.43-1.3)

1.0 (0.59-1.6)

0.89 (0.61-1.3)

2mGˆÈã

0.99 (0.02-5.5)

2.2 (0.26-7.0)

1.6 (0.32-4.5)

ƒŠƒ“ƒpŽî

0.1-1.9mG

0.48 (0.16-1.1)

1.62 (0.78-3.0)

0.91 (0.51-1.5)

2mGˆÈã

0 (0-6.8)

0 (0-11.0)

0 (0-4.2)

‚»‚Ì‘¼‚ÌŠà

0.1-1.9mG

0.89 (0.55-1.4)

1.3 (0.84-1.8)

1.1 (0.79-1.4)

2mGˆÈã

1.7 (0.21-6.2)

0.80 (0.02-4.5)

1.2 (0.26-3.6)

‘SƒKƒ“

0.1-1.9mG

0.83 (0.64-1.1)

1.07 (0.83-1.4)

0.94 (0.79-1.1)

2mGˆÈã

2.0 (0.88-4.0)

0.86 (0.18-2.5)

1.5 (0.74-2.7)

 

Še‰Æ’ë‚É‚¨‚¯‚鎥ŠE‹­“x‚̐„’è’l‚Æ‚ÌŠÖŒW‚͏ã‚ÉŽ¦‚µ‚½B@—ݐϖ\˜I‚Æ‚ÌŠÖŒW‚à•ñ‚³‚ê‚Ä‚¢‚éA@ŒXŒü‚Í‘S‚­“¯‚¶B

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---

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@@C³F ‚X‚X[‚R[‚P‚S@
¬Ž™Šà‚ÌŒ¤‹†¬‰Ê‚É‘±‚¢‚ā@‘ål‚ÌŠà‚Ì•ñ‘‚Ì“à—e‚ð•ñ‚µ‚Ü‚·B

Œ‹˜_‚Æ‚µ‚āAg‚±‚ÌŒ¤‹†‚¾‚¯‚Å‚Í“dŽ¥”g‚̉e‹¿‚ðŒ‹˜_‚¯‚邱‚Æ‚Í•s‰Â”\g‚Å‚Í‚È‚¢‚Å‚µ‚傤‚©B
i’GAAAA@j‚ÍŽ„‚̃Rƒƒ“ƒg‚Å‚ ‚Á‚ÄŒ´’˜‚É‚Í‚È‚¢•”•ªB

Œ´‘èG magnetic fields, Leukemia, and Central Nervous System tumors in Swedish adults residing near high-voltage power@lines.
@@@Œ¤‹†ŽÒ Maria Feychting and Anders Ahlbom
    Epidemiology
Ž@‚P‚X‚X‚S”N‚XŒŽ†‚É”­•\

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@‚r‚—‚…‚„‚…‚Ž‚ōs‚í‚ê‚Ä‚¢‚éƒKƒ““o˜^‚©‚ç@‘Ώێ҂R‚W–œl‚Ì’†‚ɃKƒ“‚É‚È‚Á‚½l‚ðƒsƒbƒNƒAƒbƒvB@‘Ώۂ̑—“dü‚Ì‹æˆæ‚ɍŒá‚P”N‚·‚ñ‚Å‚¢‚½l‚ð‘ΏہB
‚P‚X‚U‚O”N‚©‚ç‚P‚X‚W‚T”N‚É‚©‚¯‚ẴKƒ““o˜^‚Ì’†‚©‚çAƒŠƒXƒgƒAƒbƒv‚³‚ꂽ”]ŽîᇂƔ’ŒŒ•a‚̏Ǘá‚́A‡Œv‚T‚S‚W—áB@‚±‚ê‚ðÇ—á‚Æ‚µ‚½B@‚¢‚í‚ä‚éÇ—á‘Ώƌ¤‹†‚Å‚ ‚éB

‚Q‚T”NŠÔ‚Å‚T‚S‚W—á‚Æ‚¢‚¤‚±‚Ƃ́A‚P‚O–œl‚ ‚½‚è–ˆ”N‚Tl’ö“x‚Ì”]ŽîᇂƔ’ŒŒ•aÇ—Ⴊo‚Ä‚¢‚éB
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@“d—͉ïŽÐ‚̉ߋŽ‚Ì‹L˜^‚©‚çAƒKƒ“‚É”­•a‚µ‚½ ‚Ì‘—“dü‚Ì“d—¬’l“™‚©‚玥ŠE‚𐄒èiŽ¥ŠE‚̐„’è’lj‚µ‚½B@‚Ü‚½–ñ‚R•ª‚Ì‚Q‚̉Ƃ̎¥ŠE‚ÍŽÀÛ‚ɃXƒ|ƒbƒg‘ª’è‚ðŽÀŽ{iƒXƒ|ƒbƒg‘ª’èj‚µ‚½B@Še‰Æ’ë‚Ì“dŽ¥”g‚ÍŠe‰Æ’ë‚ÌŽå“dŒ¹‚ð‚«‚Á‚āA‰Æ’ë“à‚Ì“d‹C‹@Ší‚©‚ç‰e‹¿‚ðœ‹Ž‚·‚éŒ`‚ōs‚È‚Á‚½B@‚ ‚­‚Ü‚Å‚à‰Æ’ë“à‚ÌŽ¥ŠE‚ÌŽå‚È”­¶Œ¹‚ð‹ß‚­‚Ì‘—“dü‚É‚ ‚é‚ÆŒÀ’肵‚½B
‚±‚ê‚ç‚ÌŽ¥ŠE’l‚©‚ç@Ž€–S–˜‚̉ߋŽ‚P‚T”NŠÔ‚̗ݐϖ\˜I—ʂ𐄒肵‚½B
Ç—á‘ΏƋ¤‚É•½‹Ï‚P‚U”NŠÔ@‚»‚Ì‘—“dü‚Ì‹ß‚­‚ɏZ‚ñ‚Å‚¢‚½B

Œ‹‰Ê@Œ´•¶‚Ì•\‚R@Ç—ᐔ

 

”’ŒŒ•a

”]Žîá‡

‘SÇ—á

‚R‚Q‚T

‚Q‚Q‚R

«•Ê@’j

‚P‚X‚X

‚P‚R‚W

—

‚P‚Q‚U

‚W‚T

Ž€–SŽž‚Ì”N—î

‚P‚U[‚R‚X

‚R‚W

‚T‚R

‚S‚O[‚T‚X

‚W‚O

‚W‚O

‚U‚OˆÈã

‚Q‚O‚V

‚X‚O

 

@i’j—‚ŏǗᐔ‚É‘å‚«‚ȍ·ˆÙ‚ª‚ ‚éA–ñ‚PE‚T”{B@‚µ‚©‚µA“ú–{‚̏ꍇ‚à”’ŒŒ•a‚ÌŽ€–S—¦‚ª‚P‚O–œl‚ ‚½‚è’j‚TlA—‚Rl’ö“x‚Æ’j—ŠÔ‚ɍ·‚ª‚ ‚é‚̂ŁA‚±‚Ì’ö“x‚ÍŽ©‘R‚Æ”»’fBj

Œ‹‰Ê@Œ´•¶‚Ì•\‚S@‘—“dü‚©‚ç‚ÌŒvŽZŽ¥ŠE’l‚ÆŠà‚̃ŠƒXƒN

Ž¥ŠE‹­“x

0.9mGˆÈ‰º

1-1.9mG

 

2mGˆÈã

Šà

n

N

RR

n

RR

”’ŒŒ•a

all

278

20

0.9 (0.5-1.5)

26

1.0 (0.7-1.7)

 

AML

58

5

1.0 (0.4-2.5)

9

1.7 (0.8-3.5)

 

CML

45

2

1.4 (0.5-3.3)

7

1.7 (0.7-3.8)

 

CLL

116

8

0.8 (0.4-1.7)

7

0.7 (0.3-1.4)

”]Žîá‡

all

192

18

1.1 (0.7-2.0)

12

0.7 (0.4-1.3)

 

AstocytomaI-2

60

3

0.6 (0.1-1.8)

2

0.4 (0.1-1.3)

 

“¯ã 3-4

132

15

1.4 (0.8-2.5)

10

0.8 (0.4-1.7)

 


‚±‚ÌŒ‹‰Ê‚Å‚Í‚P‚‚fˆÈ‰º‚̏ꏊ‚ɏZ‚ސl‚É”ä‚ׂāA‚q‚q‚Í‚P‚ð‰z‚¦‚Ä‚¢‚éŠà‚ÌŽí—Þ‚ª‚ ‚邪A‚X‚T“M—Š‹æŠÔ‚̃{ƒgƒ€‚̐”Žš‚ª‚P‚ð‰z‚¦‚Ä‚¢‚éƒf[ƒ^‚Í‚È‚¢‚̂ŁAŠà‚ÆŒvŽZ’l‚ÌŽ¥ŠE‹­“x‚Æ‚ÍŠÖŒW‚Í—§Ø‚³‚ê‚Ä‚¢‚È‚¢B

@ ‚±‚ÌŒ¤‹†‚͏Ǘá‘Ώƌ¤‹†‚ƌĂ΂ê‚é‰uŠw’²¸‚ÌŽè–@‚Å‚·B@‚q‚q‚ÌŒvŽZ•û–@“™‚ÍŠ„ˆ¤‚µ‚Ü‚·B@Œµ–§‚É‚Í‚q‚q‚̓Iƒbƒd”ä‚Å‚·B

Œ‹‰Ê@Œ´•¶‚Ì•\‚T@‰ß‹Ž‚P‚T”NŠÔ‚ÌŽ¥ŠE‚̗ݐϒl‚Æ‚ÌŠÖŒW

Ž¥ŠE–\˜I

9mG¥”NˆÈ‰º

10-19mG¥”N

20mG¥”NˆÈã

30mG¥”NˆÈã

Šà

n

RR

RR

RR

”’ŒŒ•a

all

279

1.0 (0.6-1.8)

1.5 (1.0-2.4)

1.5 (0.9-2.6)

AML

58

1.5 (0.5-3.7)

2.3 (1.0-4.6)

1.9 (0.6-4.7)

CML

48

0.7 (0.1-2.6)

2.1 (0.9-4.7)

2.7 (1.0-6.4)

CLL

114

1.1 (0.4-2.3)

1.3 (0.6-2.6)

1.2 (0.4-2.6)

”]Žîá‡

all

200

1.1 (0.6-2.1)

0.7 (0.3-1.3)

0.7 (0.3-1.5)

AstocytomaI-2

61

0.9 (0.2-2.5)

0.4 (0.0-1.3)

0.4 (0.0-1.9)

“¯ã 3-4

139

1.3 (0.6-2.5)

0.8 (0.4-1.7)

0.8 (0.3-1.9)

 

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‚U. “dŽ¥”g‚ÆŠà‚̏¼ˆä˜_•¶1995”N

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Œ ˆÐ‚Ì‚ ‚éLancet‚ÌŒfÚ˜_•¶‚Å‚·.

˜_•¶FExposure to Power-frequency magnetic fielss and the risk of children cancer
Œ¤‹†ŽÒFUK Childhood Cancer Study Investigators 
ŒfÚŽGŽFTHE LANCET  Vol. 354 December 4, 1999 P1925-1931 

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‚P‚X‚X‚P”N‚©‚ç‚P‚X‚X‚U”N‚̏Ǘá‚ðŽûW‚µAÇ—á‘Ώƌ¤‹†‚ðs‚Á‚½B
‚P‚SÎ–¢–ž‚Ì”’ŒŒ•a‚Æ”]Žîᇓ™‚𒲍¸B
Ž©‘î‚Å‚ÌŽ¥ŠE”˜˜I‚¾‚¯‚Å‚Í‚È‚­AŠwZ‚Å‚ÌŽ¥ŠE”˜˜I‚à’²¸B@ŠwZ‚Å‚ÌŽ¥ŠE”˜˜I‚ÌŠ„‡‚Í‚X%’ö“x‚ðè‚ß‚é‚Ì‚Ý‚Å‚ ‚Á‚½B

”’ŒŒ•a‚̏Ǘᐔ‚Í‚X‚X‚TA”]Žîᇂ̏Ǘᐔ‚Í‚R‚T‚X‚Æ‘å‚«‚¢.@
Ž¥ŠEi•½‹Ï’lj”˜˜I‚Æ”­ŠàƒŠƒXƒN‚ÌŠÖŒW‚ÍŒ©‚‚©‚ç‚È‚©‚Á‚½B@

Ž¥ŠE0.1ƒÊTˆÈ‰º‚Ì”˜˜I‚ðŠî€‚Æ‚µ‚ā@ƒIƒbƒY”ä‚́@
”’ŒŒ•a@@0.2‚©‚ç0.4ƒÊT‚ÌŽ¥ŠE”˜˜I‚Ł@ƒIƒbƒY”ä@0.84@
@@@@0.4ƒÊTˆÈã‚ÌŽ¥ŠE”˜˜I‚Ł@ƒIƒbƒY”ä@1.40@i@CI@0.23@-@8.40AÇ—ᐔ3‚Ə¬‚³‚¢j@
i1.4”{‚Å‚ ‚邪A‚X‚T“M—Š‹æŠÔ‚̉ºŒÀ’l‚ª0.23‚Æ1ˆÈ‰º‚Ȃ̂ŁA“Œv“I‚É—LˆÓ‚Æ‚ÍŒ¾‚¦‚È‚¢.@1.4”{‚͐M—Š‚³‚ê‚È‚¢”Žš‚Æ‚È‚é.j@

”]Žîᇁ@0.2‚©‚ç0.4ƒÊT‚ÌŽ¥ŠE”˜˜I‚Ł@ƒIƒbƒY”ä‚Í0.75@
@@@@0.4ƒÊTˆÈã‚ÌŽ¥ŠE”˜˜I‚ł́@Ç—á‚Í‚È‚¢@ƒIƒbƒY”ä@ƒ[ƒB@

Ú‚µ‚­‚ÍŒ´’˜‚ð“Ç‚ñ‚Å‚­‚¾‚³‚¢.

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‚WD‰p‘‚̏¬Ž™Šà‚ÆŽ¥ŠE‚ÌŒ¤‹†\‚»‚Ì‚Q@

@7€‚ŏЉ‚½“¯‚¶Œ¤‹†‚ªA•Ê‚ÌŠwpŽGŽ‚É‚à•ñ‚³‚ê‚Ä‚¢‚Ü‚·B
ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽèB@‰¼–ó‚ð‚‚¯‚½B@ì¬F@2003-4-7

ŒfÚŽFBritish Journal of Cancer, December 2000, Volume 83, Number 11, Pages 1573-1580
˜_•¶–¼FChildhood cancer and residential proximity to power lines
@@@@@‘—“dü‹ß–T‚̏ZŠÂ‹«‰º‚É‚¨‚¯‚鎥ŠE–\˜I‚Ə¬Ž™‚ªƒ“@
Œ¤‹†ŽÒFU.K. Childhood Cancer Study Investigators
 Writing Committee J Skinner East Anglia region; MP Maslanyj; TJ Mee and SG Allen National Radiological Protection Board; J Simpson Leukemia Research Fund Data Management Processing Group; E Roman South Midlands region; NE Day East Anglia region
@

Abstract
@ŠT—v
In the United Kingdom Childhood Cancer Study, a population-based case-control study covering the whole of England, Scotland and Wales, measured power-frequency magnetic fields were not found to be associated with risk for any malignancy
iˆ««‚́j.
‰p‘¬Ž™‚ªƒ“Œ¤‹†‚̈êŠÂ‚Æ‚µ‚čs‚Á‚½Œ¤‹†‚ŁA‘SƒCƒ“ƒOƒ‰ƒ“ƒhAƒXƒRƒbƒgƒ‰ƒ“ƒhAƒEƒG[ƒ‹ƒY‚ðƒJƒo[‚µ‚½Ç—á‘Ώƌ¤‹†‚ðs‚Á‚½BŽÀ‘ª‚µ‚½Ž¥ŠE‹­“x‚͈««Žîᇂ̃ŠƒXƒN‘‰Á‚ðŒ©o‚³‚È‚©‚Á‚½B@

To examine further the risk associated with residential proximity to electricity supply equipment, distances to high-voltage lines, underground cables, substations and distribution circuits were collected for 3380 cases and 3390 controls.
3380
‚̏Ǘá‚Æ3390‚̑ΏƂɊւµ‚āA‚³‚ç‚ɁA“d—Í‘—“dÝ”õ‚ւ̋ߏZA‚ˆ³‘—“düE’n’†‘—“düE•Ï“dE”z“dÝ”õ‚Æ‚Ì‹——£‚𒲍¸‚µ‚½B@

Magnetic field exposure from this equipment was calculated using distance, load and other circuit information.
–\˜I‚µ‚Ä‚¢‚鎥ŠE‹­“x‚Í‚±‚ê‚ç‚Ì“d—͐ݔõ‚©‚ç‚Ì‹——£A•‰‰×“d—¬‚»‚Ì‘¼‚̏î•ñ‚ÉŠî‚¢‚āAŒvŽZ‚ðs‚Á‚½B

There was no evidence that either proximity to electrical installations or the magnetic field levels they produce in the UK is associated with increased risk of childhood leukemia or any other cancer.
“d—͐ݔõ‚Ƃ̋ߏZ‚â‚»‚ê‚ç‚©‚ç‚ÌŽ¥ŠE–\˜I‚É‚æ‚鏬Ž™”’ŒŒ•a‚Æ‚»‚Ì‘¼‚Ì‚ª‚ñ‚̃ŠƒXƒN‚Ì‘‰Á‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

Odds ratios of 0.73 (95% CI = 0.42-1.26) for acute lymphoblastic leukemia, 0.75 (95% CI = 0.45-1.25) for all leukemias, 1.08 (95% CI = 0.56-2.09) for central nervous system cancers and 0.92 (95% CI = 0.64-1.34) for all malignancies were obtained for residence within 50 m of an overhead line.
‰Ë‹ó‚ˆ³‘—“dü‚©‚ç50mˆÈ“à‚ɏZ‚ޏZ–¯‚ÉŠÖ‚µ‚āAŠe‚ª‚ñ‚̃ŠƒXƒN‚Ì‘‰ÁiƒIƒbƒY”ä‚ƐM—Š‹æŠÔ‚́A‹}«ƒŠƒ“ƒp«”’ŒŒ•a0.73(0.42-1.26)A‘S‚Ä‚Ì”’ŒŒ•a0.75(0.45-1.25)A”]Žîá‡1.08(0.56-2.09)A‘S‚Ă̈««Žîá‡0.92(0.64-1.34)‚Å‚ ‚Á‚½B

When individuals with a calculated magnetic field exposure 0.2
ƒÊT were compared to those in a reference category of exposure <0.1ƒÊT, odds ratios of 0.51 (95% CI = 0.11-2.33) for acute lymphoblastic leukemia, 0.41 (95% CI = 0.09-1.87) for total leukemia, 0.48 (95% CI =0.06-3.76) for central nervous system cancers and 0.62 (95% CI = 0.24-1.61) for all malignancies were obtained.
Ž¥ŠE‚ÌŒvŽZ’l‚ʼnðÍ‚ðs‚Á‚½A0.1ƒÊTˆÈ‰º‚Ì–\˜I‚É”äŠr‚µ‚āA0.2ƒÊTˆÈã‚Ì–\˜I‚ł́AŠe‚ª‚ñ‚̃ŠƒXƒN‚Ì‘‰ÁiƒIƒbƒY”ä‚ƐM—Š‹æŠÔj‚́A‹}«ƒŠƒ“ƒp«š\ŒŒ•a0.51(0.11-2.32jA‘S”’ŒŒ•a0.41(0.09-1.87)A”]Žîá‡0.48(0.08-3.76)A‘Sˆ««Žîá‡0.62(0.24-1.61)‚Å‚ ‚Á‚½B@

 

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‚XD‰p‘‚̏¬Ž™Šà‚Æ“dŠE–\˜I@


‰p‘‚É‚¨‚¯‚é‘—“dü—R—ˆ‚Ì“dŽ¥”g‚ð¬Ž™‚ªƒ“‚ÌŠÖŒW‚̉uŠwŒ¤‹†‚ŁA“dŠE–\˜I‚É’…–Ú‚µ‚½Œ¤‹†
ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽèB@‰¼–ó‚ð‚‚¯‚½B@@ì¬F@‚Q‚O‚O‚R|‚S|‚X

ŒfÚŽFBritish Journal of Cancer, 18 November 2002, Volume 87, Number 11, Pages 1257-1266
˜_•¶–¼FExposure to power frequency electric fields and the risk of childhood cancer in the UK
‰p‘‚É‚¨‚¯‚é“d—ÍŽü”g”‚Ì“dŠE–\˜I‚Ə¬Ž™‚ªƒ“ƒŠƒXƒN‚Æ‚ÌŠÖŒW
Œ¤‹†ŽÒvJ Skinner, T J Mee, R P Blackwell, M P Maslanyj, J Simpson, S G Allen, N E Day,@a and United Kingdom Childhood Cancer Study Investigators writing committee

Abstract
The United Kingdom Childhood Cancer Study, a population-based case-control study covering the whole of Great Britain, incorporated a pilot study measuring electric fields.
‘SƒOƒŒ[ƒgƒuƒŠƒeƒ“‚ðƒJƒo[‚µ‚½Ç—á‘Ώƌ¤‹†‚ª‰p‘‚̏¬Ž™‚ªƒ“Œ¤‹†‚Æ‚µ‚čs‚í‚êA“dŠE–\˜I‚ÉŠÖ‚µ‚Ä‚à’²¸‚ðs‚Á‚½B

Measurements were made in the homes of 473 children who were diagnosed with a malignant neoplasm between 1992 and 1996 and who were aged 0-14 at diagnosis, together with 453 controls matched on age, sex and geographical location.
1992
”N‚©‚ç1996”N‚̊ԂɈ««ŽîᇂƐf’f‚³‚ꂽ¬Ž™473–¼‚ƁA”N—îE«•ÊE’nˆæ‚ðƒ}ƒbƒ`‚³‚¹‚½‘ΏÆ453–¼‚̉ƒë‚É‚¨‚¯‚é–\˜Ió‹µ‚𑪒肵‚½B

Exposure assessments comprised resultant spot measurements in the child's bedroom and the family living-room.
‘ª’è‚ÍŽq‹Ÿ‚̐QŽº‚ƉƑ°‚Ì‹ŠÔ‚É‚¨‚¯‚éƒXƒ|ƒbƒg‘ª’è‚ðŠÜ‚ñ‚Å‚¢‚éB

Temporal stability of bedroom fields was investigated through continuous logging of the 48-h vertical component at the child's bedside supported by repeat spot measurements.
–\˜I‚ÌŽžŠÔ•Ï“®‚ð”cˆ¬‚·‚邽‚߂ɁAƒXƒ|ƒbƒg‘ª’è‚ðŒJ‚è•Ô‚µ‚È‚ª‚çAŽq‹Ÿ‚̐QŽº‚Å48ŽžŠÔ˜A‘±‘ª’è‚ðs‚Á‚½B

The principal exposure metric used was the mean of the pillow and bed center measurements.
Šî–{“I‚È–\˜IŽw•W‚Æ‚µ‚ẮAƒxƒbƒh‚Ì’†S‚Æ–‚Ì‚Æ‚±‚ë‚Å‚Ì‘ª’è’l‚Ì•½‹Ï’l‚ðŽg—p‚µ‚½B

For the 273 cases and 276 controls with fully validated measures, comparing those with a measured electric field exposure 20 V m-1 to those in a reference category of exposure <10 V m-1, odds ratios of 1.31 (95% confidence interval 0.68-2.54) for acute lymphoblastic leukemia, 1.32 (95% confidence interval 0.73-2.39) for total leukemia, 2.12 (95% confidence interval 0.78-5.78) for central nervous system cancers and 1.26 (95% confidence interval 0.77-2.07) for all malignancies were obtained.
273
‚̏Ǘá‚Æ276‚̑ΏƂɊւµ‚Ä‚ÍŠ®àø‚ȃf[ƒ^‚ª“¾‚ç‚ꂽB“dŠE‚P‚OV/mˆÈ‰º‚Ì–\˜I‚ɑ΂µ‚Ä‚Q‚OV/mˆÈã‚Ì“dŠE–\˜I‚ð”äŠr‚µ‚½‚Æ‚«‚̃IƒbƒY”ä‚́A ƒŠƒ“ƒp«”’ŒŒ•a 1.31 (l 0.68-2.54), ‘S”’ŒŒ•a 1.32 (0.73-2.39)A”]Žîᇠ2.12 (0.78-5.78)A‘S‚ª‚ñ 1.26 (0.77-2.07)@‚Å‚ ‚Á‚½B

When considering the 426 cases and 419 controls with no invalid measures, the corresponding odds ratios were 0.86 (95% confidence interval 0.49-1.51) for acute lymphoblastic leukemia, 0.93 (95% confidence interval 0.56-1.54) for total leukemia, 1.43 (95% confidence interval 0.68-3.02) for central nervous system cancers and 0.90 (95% confidence interval 0.59-1.35) for all malignancies.
–³Œø‚È‘ª’è‚Ì‚È‚¢‚S‚P‚X‚̏Ǘá‚Æ419‚̑ΏƂð‘ΏۂƂµ‚ăIƒbƒY”ä‚ðŒvŽZ‚·‚ê‚΁AƒŠƒ“ƒp«”’ŒŒ•a@0.86 (0.49-1.51)A‘S”’ŒŒ•a 0.93 (0.56-1.54)A”]Žîᇠ1.43 (0.68-3.02)A‘S‚ª‚ñ 0.90 (0.59-1.35) ‚Å‚ ‚Á‚½B

With exposure modeled as a continuous variable, odds ratios for an increase in the principal metric of 10Vm-1 were close to unity for all disease categories, never differing significantly from one.
‚±‚ê‚ç‚ÌŒ‹‰Ê‚©‚çA“dŠE‚Ö‚Ì–\˜I‚Å10V/m‚ ‚½‚è‚̃ŠƒXƒN‚Í‚Ù‚Ú1‚Å‚ ‚èAƒŠƒXƒN‚Ì‘‰Á‚Í‚È‚¢B

 

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‚P‚OD‰p‘‚̐E‹Æ“I‚ÈŽ¥ŠE”˜˜I‚Æ”]Žîᇂ̌¤‹†


http://news.bbc.co.uk/hi/english/health/newsid_1535000/1535316.stm‚É‚ ‚Á‚½“à—e‚Å‚·B@

ƒCƒMƒŠƒX‚Ì“d—͉ïŽÐ‚̏]‹Æˆõ‚ð‘Ώۂɂµ‚½Œ¤‹†‚ŁAƒRƒz[ƒgŒ¤‹†‚Æ‚ ‚邪A‘OŒü‚«‚̃Rƒz[ƒg‚Æ‚Í–¾‹L‚³‚ê‚Ä‚¢‚È‚¢B
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Œ‹‰Ê‚́A”]Žîᇂ̃ŠƒXƒN‚͈ê”ʂɃŠƒXƒN‚É”ä‚ׂđ傫‚­‚È‚©‚Á‚½A
]‹Æˆõ‚Í‚æ‚è‘å‚«‚ÈŽ¥ŠE‚ð–\˜I‚µ‚Ä‚¨‚èAˆê”Ê‚ÌŒöO‚ª•Ï“dÝ”õE‘—“dÝ”õ‚©‚çŽó‚¯‚鎥ŠE‚æ‚è‘å‚«‚¢B@
‚»‚¤‚µ‚½‚æ‚è‘å‚«‚¢Ž¥ŠE–\˜I‰º‚Å‚à”]Žîᇂ͑‰Á‚µ‚Ä‚¢‚È‚¢‚̂ŁAˆê”ÊŒöO‚͈ÀS‚Å‚«‚é@‚Ɓ@‚È‚Á‚Ä‚¢‚éB@

‚±‚ÌŒ¤‹†‚ÍOccupational and Environmental Medecine journal ‚ÉŒfÚ‚³‚ꂽB
]‹Æˆõ‚ª‚Ç‚Ì’ö“x‚ÌŽ¥ŠE‚É–\˜I‚µ‚Ä‚¢‚½‚Ì‚©‚́A‚±‚Ì‹LŽ–‚Å‚Í–¾Šm‚É‚È‚Á‚Ä‚¢‚È‚¢B@
Œ´’˜‚ð“Ç‚Þ•K—v‚ª‚ ‚è‚Ü‚·B

’áŽü”gŽ¥ŠE‚ÉŠÖ‚µ‚āAÅ‹ß‚ÌIARC‚Ì”­•\‚́AŽ¥ŠE‚͏¬Ž™”’ŒŒ•a‚̐„iˆöŽq‚©‚à’m‚ê‚È‚¢A‚»‚̉”\«‚ª‚ ‚éB‚µ‚©‚µA‘ål‚̃Kƒ“‚â‚»‚Ì‘¼‚̃Kƒ“‚ÉŠÖ‚µ‚Ä‚Í–â‘è‚È‚¢‚悤‚¾‚ªA‚Ü‚¾Œ‹˜_‚͏o‚¹‚È‚¢A‚Æ‚¢‚Á‚½“à—e‚Å‚µ‚½B@

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‚P‚PD“dŽ¥”g‚ÆŠà‚Ì‹¾X˜_•¶1996”N@

ˆãŠwŽ‚Æ‚µ‚Ä‚ÍŒ ˆÐ‚Ì‚ ‚é‚Æ‚³‚ê‚é‚k‚‚Ž‚ƒ‚…‚”‚ÉŒfÚ‚³‚ꂽ“ú–{‚̉uŠw‚Ì—á‚Å‚·B

Œ¤‹†ŽÒF Shigeru Sokejima, Sadanobu Kagamimori, Toshiki Tatsumura@
˜_•¶F Electric power consumption and leukaemia death rate in Japan@
ŒfÚŽGŽF THE LANCET Vol.348 o September 21, 1996 P21-822@

‹¾XE‚»‚¤‚¯“‡‚ç‚ÌŒ¤‹†‚ŁA‘—“dü—R—ˆ‚ÌŽ¥ŠE‚ª¬Ž™‚ª‚ñ‚Ȃǂ̊댯ˆöŽq‚Å‚ ‚邱‚Æ‚ðŠm‚©‚ß‚éˆ×‚ɁAŒ`‘Ô‰uŠw‚Æ‚¢‚¤‚Ì‚Å‚µ‚傤‚©H@‚ ‚鎖Û‚Æ”­ƒKƒ“‚Ì‘Š‘ΓI‚ÈŠÖŒW‚𒲍¸‚µ‚Ä‚¢‚Ü‚·B@

‘—“dü—R—ˆ‚ÌŽ¥ŠE‚ªŠëŒ¯ˆöŽq‚Å‚ ‚é‚È‚ç‚΁A“d—͏Á”ï—Ê‚ª‘½‚¢êŠ‚ł́A‘å‚«‚¢‘—“dü“d—¬‚ª—¬‚êA“d—¬‚É‚æ‚Á‚Ä‘å‚«‚ÈŽ¥ŠE‚ª”­¶‚µA‚»‚±‚Å‚ÍŠà‚ª‘½‚­‚È‚Á‚Ä‚¢‚é‚Ì‚Å‚Í‚È‚¢‚©‚Ɖ¼’肵‚½B@

‘S‘Še“s“¹•{Œ§–ˆ‚Ì‚ª‚ñ‚ÌŽ€–S—¦‚ÆŠeŒ§‚̐lŒû“–‚½‚è‚Ì“d—͏Á”ï—Ê‚Æ‚ÌŠÖŒW‚𒲂ׂ½B@
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‚P‚QD Savitz 1995‚̘_•¶‚©‚ç


D. A. Savitz 1995
‚̘_•¶‚Å‚·B
˜_•¶–¼F@Exposure assessment strategies in epidemiological studies of health effects of electric and magnetic fields@
ŒfÚŽGŽF@The Science of the Total Environment. 168(1995)@

‚±‚̘_•¶‚ð“Ç‚ñ‚ňȉº‚Ì2“_‚ª‹C‚É‚È‚è‚Ü‚µ‚½B
‚PjVDT‚©‚ç‚Ì“dŽ¥”g‚Ì–â‘è@
‚©‚‚ăNƒ‰ƒXƒ^‚ƌĂ΂ê‚é“Á’èW’c‚É‚¨‚¢‚ÄVDTì‹Æ‚ðs‚Á‚Ä‚¢‚½”D•w‚Ɉُ킪”­¶‚µ‚½B1980”N‘ã‚ÌŒ¤‹†‚ł́AVDTì‹Æ‚Æ”DPˆÙí‚ÉŠÖ˜A‚ª‚ ‚é‚Æ‚¢‚¤•ñ‚ª‚ ‚Á‚½B@Å‹ß‚Ì•ñ‚Ì‘½‚­‚Å‚Í‚»‚¤‚µ‚½–â‘è‚Í‚È‚¢‚Æ‚È‚Á‚Ä‚¢‚éB

VDT
ì‹Æ‚Å‚Í–Ú‚Ì”æ‚ê‚âlŠÔHŠw“I‚È—v‘f‚âŽdŽ–‚ÉŠÖ˜A‚·‚éƒXƒgƒŒƒX‚̉e‹¿‚àl‚¦‚ç‚ê‚éBVDT‚©‚ç˜R‰k‚·‚é’áŽü”g“dŽ¥ŠE‚Æ‚Ì–â‘è‚ðØ‚蕪‚¯‚邱‚Æ‚ª¢“ï‚Å‚ ‚éB
1992
”N‚Ì‚ ‚é•ñ‚Å‚ÍVDT‚©‚ç‚Ì’áŽü”g“dŽ¥ŠE‚ÌŽÀ‘ª‚ðs‚Á‚½Œ¤‹†‚É‚æ‚ê‚΁AƒŠƒXƒN‚Æ‚È‚Á‚Ä‚¢‚éB@

‚QDƒƒCƒ„ƒR[ƒh‚͐̂©‚ç‰uŠw‚ÌŽè–@‚Æ‚µ‚ÄŽg—p‚³‚ê‚Ä‚«‚Ä‚¢‚éB@
@‚±‚̃ƒCƒ„ƒR[ƒh‚͉ߋŽ‚Ì’·ŠúŠÔ‚ɂ킽‚é–\˜I‚ÌŽw•W‚Æ‚µ‚Ä‚Í“K‚µ‚Ä‚¢‚éB

@@ˆÈã@@Ú×‚ÍŒ´’˜‚ð“Ç‚ñ‚Å‚­‚¾‚³‚¢B

•Åƒgƒbƒv‚Ö–ß‚é

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‚P‚RD“d‹C’g–[ƒxƒbƒh‚È‚Ç‚©‚ç‚Ì“dŽ¥ŠE‚Æ‘ÙŽ™‚ÌŽ€ŽY‚ւ̉e‹¿

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè‚µ‚Ü‚µ‚½B@‚Ü‚¾Œ´’˜‚Ì‘S•¶‚Í“üŽè‚µ‚Ä‚¢‚Ü‚¹‚ñB
“d‹C’g–[ƒxƒbƒh‚È‚Ç‚©‚ç‚Ì“dŽ¥ŠE‚ª”DPEoŽY‚ɉe‹¿‚·‚é‚Æ‚¢‚¤‰uŠw’²¸Œ‹‰Ê‚Å‚·B@

ŒfÚGAmerican Journal of Epidemiology, Vol 129, Issue 1 220-224, 1989 @
˜_•¶FFetal loss associated with two seasonal sources of electromagnetic field exposure
‹Gß“I‚ÉŽg—p‚·‚é“dŽ¥ŠE–\˜I‚ÉŠÖŒW‚µ‚½‘ÙŽ™‚ÌŽ€ŽY@

Œ¤‹†ŽÒFN Wertheimer and E Leeper @
Department of Preventive Medicine, University of Colorado Health Sciences Center, Denver 80262 @

ŠT—vG@
We have studied two sources of electromagnetic fields where exposure is highly seasonal (ceiling cable electric heat and electrically heated beds).
@

‹Gß‚É‚æ‚Á‚ÄŽg—p‚³‚ê‚é“d‹C’g–[A“d‹Cƒxƒbƒh‚ƁA“VãƒP[ƒuƒ‹“d‹C’g–[i‹ï‘Ì“I‚ɂ͂ǂ̂悤‚È‚à‚́Hj‚Ì“ñ‚‚©‚ç‚Ì“dŽ¥ŠE–\˜I‚ÉŠÖ‚µ‚ÄŒ¤‹†‚ðs‚Á‚½B@

Because many potential confounders could not be addressed, we can make no valid statement about overall differences in abortion rates between those exposed and those not exposed to these seasonal sources.@

‘ΏۂƂµ‚½“dŽ¥ŠEˆÈŠO‚̌𗍈öŽq‚Ì”rœ‚ª‚Å‚«‚Ä‚¢‚È‚¢‚̂ŁA‚±‚ê‚ç‚Ì‹@Ší‚©‚ç‚Ì“dŽ¥ŠE‚É–\˜I‚·‚é‚©‚µ‚È‚¢‚©‚É‚æ‚éˆÙí—¦‚̍·ˆÙ‚ÉŠÖ‚µ‚āAŠm’è“I‚È‚±‚Æ‚Í‚¢‚¦‚È‚¢B@

However, by analyzing seasonal trends, we have minimized the problem of unaddressed confounders because we did not look at a difference between the user and nonuser groups, but rather at a difference within the user group during months of higher exposure compared with months of lower exposure.
@

 
‚µ‚©‚µAŒð—ˆöŽq‚̉e‹¿‚ð‚Å‚«‚邾‚¯­‚È‚­‚µA“d‹Cƒxƒbƒh‚ÌŽg—p‚Ì•p“x‚È‚Ç‚Æ‚ÌŠÖŒW‚ð‰ðÍ‚µ‚½B@

Thus, each user group provides its own control. The function of the nonuser control group is simply to assure that any seasonal trend found in the user group is not just a general seasonal variation in reported fetal loss that can be found equally well in the nonuser population.
@

‹Cƒxƒbƒh‚È‚Ç‚ÌŽg—pŽÒ‚É‚¨‚¯‚é‘ÙŽ™Ž€ŽY‚ÌŠ„‡‚́A”ñŽg—pŽÒŒQ‚ł͈ê”Ê‚ÌŠ„‡‚Æ“¯‚¶’ö“x‚Å‚ ‚Á‚½‚ªAŽg—pŽÒŒQ‚ł͈ê”Ê‚ÌŠ„‡‚ƈقȂÁ‚Ä‚¢‚½B

Using this technique, we found that each user group reported fetal loss disproportionately(•s‹Ït‚È) often during the season when electromagnetic field exposure was increasing. @

“dŽ¥ŠE–\˜I‚ª‘‰Á‚·‚é‹Gßi“d‹Cƒxƒbƒh‚È‚Ç‚ðŽg—p‚·‚é‹Gß‚ł́j‚ł́A•s‹Ït‚È‘ÙŽ™‚ÌŽ€ŽY‚ðŒ©o‚µ‚½B

 

•Åƒgƒbƒv‚Ö–ß‚é

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‚P‚SD“d‹C–Ñ•z‚ÌŽ¥ŠE‚Ə¬Ž™Šà‚ÌŒ¤‹†

 

“d‹C–Ñ•z‚Ì“dŽ¥”g‚Ə¬Ž™”]Žîᇂ̊֌W‚̏Ǘá‘Ώƌ¤‹†Œ‹‰Ê@@
Œ¤‹†ŽÒFSusan Preston-Martin et al;@
˜_•¶–¼FBrain Tumor Risk in Children in Relation to Use of Electric Blankets and Water Bed@ Heators@
ŒfÚŽGŽFAmerican Journal of Epidemiology. Vol. 143 No.11 1996

ŠT—v@
1984-1991
”NŠÔ‚É19ÎˆÈ‰º‚Å”]ŽîᇂƐf’f‚³‚ꂽÇ—á540‚ƃ}ƒbƒ`‚³‚¹‚½‘ΏÆ801‚ðŒ¤‹†‘ΏۂƂµ‚½Ç—á‘Ώƌ¤‹†‚Å‚ ‚éB

•êe‚ªŽq‹Ÿ‚Ì”DPŽž‚É“d‹C–Ñ•z‚ðŽg—p‚µ‚½ê‡‚Ì”]Žîᇂ̃ŠƒXƒN‚́@OR=0.90 iCI:0.6-1.2j@
•êe‚ªŽq‹Ÿ‚Ì”DPŽž‚É“d‹C‰·…ƒxƒbƒh‚ðŽg—p‚µ‚½ê‡‚Ì”]Žîᇂ̃ŠƒXƒN‚́@OR=0.90 iCI:0.6-1.3j@

“d‹C–Ñ•z‚ð”DPŠúŠÔ‚̉½ŽžŽg—p‚µ‚½‚©“™‚ɂ‚¢‚Ä‚à’²¸‚µ‚½‚ªŒ‹‰Ê‚ɂ͕ω»‚Í–³‚©‚Á‚½B

Žq‹Ÿ‚ª“d‹C–Ñ•z‚ðŽg—p‚µ‚Ä‚¢‚½ê‡‚Ì”]Žîᇂ̃ŠƒXƒN‚́@OR=1.0 iCI:0.6-1.7j@
Žq‹Ÿ‚ª“d‹C‰·…•Ê“r‚ðŽg—p‚µ‚Ä‚¢‚½ê‡‚Ì”]Žîᇂ̃ŠƒXƒN‚́@OR=1.2 iCI:0.7-2.0j@

i‘Š‘Ί댯“xOR‚ª1.2”{‚Æ‚È‚Á‚Ä‚¢‚邪ACI‚̉ºŒÀ‚ª0.7‚Æ1ˆÈ‰º‚Å‚ ‚é‚̂ŁAŒ‹‰Ê‚Í—LˆÓ‚Æ‚Í‚¢‚¦‚È‚¢Bj@

Žq‹Ÿ‚̐«•ÊA”N—îAlŽí‚È‚Ç‚Å’²¸‚ðs‚Á‚½‚ªAŒ‹‰Ê‚Í•Ï‚í‚ç‚È‚©‚Á‚½B@
‚±‚Ì‚±‚Æ‚©‚çAŒ‹˜_‚Æ‚µ‚Ä‚Í“d‹C–Ñ•z‚â“d‹C‰·…ƒxƒbƒh‚©‚ç˜R‰k‚·‚é50Hz/60Hz‚Ì’áŽü”gŽ¥ŠE‚ª¬Ž™‚Ì”]Žîᇂ𑝉Á‚³‚¹‚é‚Æ‚Í‚¢‚¦‚È‚¢B@

‚±‚ê‚ç‚Ì“d‹C–Ñ•z‚©‚ç˜R‰k‚·‚é’áŽü”gŽ¥ŠEi4ƒ~ƒŠƒKƒEƒX‚©‚ç‚Q‚Qƒ~ƒŠƒKƒEƒXj‚́A‘—“dü—R—ˆ‚̏ZŠÂ‹«‰º‚É‘¶Ý‚·‚é’áŽü”gŽ¥ŠEi‚P‚È‚¢‚µ‚Qƒ~ƒŠƒKƒEƒX’ö“xj‚æ‚è‹­‚¢Ž¥ŠE‚Å‚ ‚éB@
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“Á’è‚Ì’nˆæ‚̃f[ƒ^‚ɍi‚Á‚ÄŒ©‚½Žž‚Ì“ÁˆÙ“_A@
ƒƒXƒAƒ“ƒWƒFƒ‹ƒX’n‹æ‚ŁA•êe‚ª”DP’†‚É“d‹C‰·…ƒxƒbƒh‚ðŽg—p‚µ‚Ä‚¢‚½Žž‚ɁAŽq‹Ÿ‚ª”]ŽîᇂɂȂ郊ƒXƒN@OR=2.1@iCI: 1.0-4.4j‚Å—LˆÓ‚ɍ‚‚¢B‚µ‚©‚µ‘¼‚̃VƒAƒgƒ‹‚ƃTƒ“ƒtƒ‰ƒ“ƒVƒXƒR’n‹æ‚̃f[ƒ^‚ð‡ŽZ‚µ‚ÄŒvŽZ‚µ‚Ä‚Ý‚é‚ƁAOR=0.7 (CI: 0.4-1.0)‚Å‚ ‚Á‚½B

ˆÈ‰º‚ÍŽ„‚̃Rƒƒ“ƒgF@
Žq‹Ÿ‚ª“d‹C–Ñ•z‚È‚Ç‚©‚ç‚Ì’áŽü”gŽ¥ŠE‚ª”]‚ÌŠài”]Žîᇁj‚𑝔­‚·‚é‚©‚ÉŠÖ‚µ‚āA‘ÙŽ™‚ÌŽž‚É•êe‚ª–\˜I‚µ‚Ä‚¢‚½Žž‚ƁA¶‚Ü‚ê‚Ä‚©‚çŽq‹Ÿ‚ª“d‹C–Ñ•z“™‚ðŽg—p‚µ‚½Žž‚Ì2‚Â‚ÌðŒ‚ÅŒŸ“¢‚µ‚Ä‚¢‚éB@“Á’è‚Ì’nˆæ‚̃f[ƒ^‚ðŒ©‚½Žž‚É‚Í“ÁˆÙ“_‚ª‚ ‚邪A‘S‘Ì‚Æ‚µ‚ẮA’áŽü”gŽ¥ŠE‚̉e‹¿‚ÍŒ©‚ç‚ê‚È‚¢@‚Æ‚¢‚¤Œ‹˜_‚Æ‚È‚Á‚Ä‚¢‚éB
“Á’è‚Ì’nˆæ‚Ì‘SZ–¯‚ð‘ΏۂƂµ‚½Œ¤‹†‚Ȃ̂ŁAÇ—á‚Ì‘I‘ð‚ȂǂɃoƒCƒAƒX‚Í‚È‚¢B@

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•Åƒgƒbƒv‚Ö–ß‚é

 

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‚P‚S‚`D“d‹C–Ñ•zŽg—p‚Æ“û‚ª‚ñƒŠƒXƒN@2000”N‚ÌŒ¤‹†


ŒfÚŽFAmerican Journal of Epidemiology 2000;152:41-49.
ƒ^ƒCƒgƒ‹FElectric blanket use and breast cancer in the Nurses' Health Study.
“d‹C–Ñ•z‚ÌŽg—p‚ÆŠÅŒì•w‚Ì“û‚ª‚ñƒŠƒXƒN
Œ¤‹†ŽÒFLaden F, et al.

ŠT—v
“d‹C–Ñ•z‚©‚ç”­¶‚·‚é“dŽ¥ŠE‚É‚æ‚Á‚āA“û‚ª‚ñƒŠƒXƒN‚ª‚‚Ü‚é‰Â”\«‚ªŒ¾‚í‚ê‚Ä‚¢‚邪A•Ä‘‚ÌŠÅŒì•w‚ð‘Ώۂɂµ‚½‘å‹K–Í‚È’²¸‚ł́A‚Í‚Á‚«‚肵‚½ƒŠƒXƒN‚̏㏸‚Í‚È‚©‚Á‚½B
ƒn[ƒo[ƒh‘åŠw‚̃Oƒ‹[ƒv‚É‚æ‚邱‚ÌŒ¤‹†‚́A•Ä‘‰uŠwŽGŽ2000”N‚VŒŽ‚P“ú†‚É•ñ‚³‚ꂽB

E“d‹C–Ñ•zA“dŽ¥ŠE‚Ì”­¶Œ¹
“dŽ¥ŠE‚Ö‚Ì”˜˜I‚ƁA“û‚ª‚ñ‚ðŠÖŒW‚¯‚鉼à‚ªA’ñ¥‚³‚ê‚Ä‚¢‚éB
‚»‚̃ƒJƒjƒYƒ€‚Æ‚µ‚āA“dŽ¥ŠE‚Ö‚Ì”˜˜I¨ƒƒ‰ƒgƒjƒ“i¼‰Ê‘̃zƒ‹ƒ‚ƒ“j‚Ì•ª”å—}§¨ƒGƒXƒgƒƒQƒ“ƒŒƒxƒ‹‚̏㏸¨“û‚ª‚ñƒŠƒXƒN‚̏㏸‚Æ‚¢‚¤Œo˜H‚È‚Ç‚ª‘z’肳‚ê‚Ä‚¢‚éB

“dŽ¥ŠE‚Ì”­¶Œ¹‚Æ‚µ‚ẮA‰®ŠO‚Ì‘—“dü‚≮“à‚Ì“d‰»»•i‚È‚Ç‚ª‚ ‚éB
“d‹C–Ñ•z‚É‚æ‚Á‚ж‚¸‚é“dŽ¥ŠE‚́A‡–°’†‚Ì’·ŽžŠÔ‚ɂ킽‚èA’¼Úg‘Ì‚ð‚³‚ç‚·‚±‚Æ‚É‚È‚é‚̂ŁA”­¶Œ¹‚Æ‚µ‚ďd—v‚¾B
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1976
”N‚ÉŠJŽn‚³‚ꂽA•Ä‘‚̏—«ŠÅŒì•w‚ð‘ΏۂƂ·‚é‘å‹K–͂ȒǐՒ²¸‚̈êŠÂ‚Æ‚µ‚āA87,000–¼‚ɑ΂·‚鎿–â•[’²¸‚ð1992”N‚ɍs‚¢AŒ¤‹†ŠJŽni1976”NjˆÈ‘O‚ÌŽžŠú‚©‚ç‚Ì“d‹C–Ñ•z‚ÌŽg—p—ð‚ɂ‚¢‚Ä‚½‚¸‚Ë‚½B

“ñ’Ê‚è‚̉ðÍ‚ð‚¨‚±‚È‚Á‚½B
‚ЂƂ‚́A1992”N‚É’²‚ׂ½i‰ß‹Ž‚́j“d‹C–Ñ•z‚ÌŽg—p—ð‚ƁA‚»‚ÌŒã1996”N‚܂łɐV‚½‚É”­¶‚µ‚½954—á‚Ì“û‚ª‚ñ‚Æ‚ÌŠÖŒW‚ðAu‘OŒü‚«v‚É•ªÍ‚µ‚½B
‚à‚¤‚ЂƂ‚́A‚¨‚È‚¶1992”N‚É’²‚ׂ½“d‹C–Ñ•z‚ÌŽg—p—ð‚ƁA‚»‚êˆÈ‘O‚Ì1976”N‚©‚ç92”N‚Ü‚Å‚É‚·‚Å‚É”­¶‚µ‚Ä‚¢‚½2,426—á‚Ì“û‚ª‚ñ‚Æ‚ÌŠÖŒW‚ðAuŒã‚ëŒü‚«v‚É•ªÍ‚µ‚½B

E‚Í‚Á‚«‚肵‚½ƒŠƒXƒNã¸‚È‚µ
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u‘OŒü‚«v•ªÍ‚ÌŒ‹‰ÊA’èŠú“I‚ÈŽg—p—ð‚ª‚È‚¢ŽÒ‚Æ”ä‚ׂ½ê‡‚Ì“û‚ª‚ñƒŠƒXƒN‚́A’èŠú“I‚ÈŽg—p—ð‚ª‚ ‚鏗«‚Å‚Í8%‚‚­A1976”NˆÈ‘O‚ÉŽg—p‚µ‚Ä‚¢‚½—«‚Å‚Í11%‚‚©‚Á‚½‚ªA“Œv“I‚ɈӖ¡‚Ì‚ ‚錋‰Ê‚Å‚Í‚È‚©‚Á‚½B

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¡‰ñ‚ÌŒ¤‹†‚́A‚±‚Ì–â‘è‚ɂ‚¢‚āA‰‚ß‚Ä‚Ì‘OŒü‚«ƒRƒz[ƒgŒ¤‹†‚̂悤‚¾B
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‚½‚¾‚µA10%‚Ä‚¢‚ǂ̂킸‚©‚ȃŠƒXƒN‚̏㏸‚܂Ŕے肵‚«‚ê‚È‚¢‚̂́AŒ¤‹†ŽÒ‚à—¯•Û‚µ‚Ä‚¢‚é‚Æ‚¨‚è‚Å‚ ‚éB
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‚·‚®‚É‚±‚¤‚µ‚½Œ‹‰Ê‚ªo‚»‚낤‚Æ‚ÍŽv‚¦‚È‚¢‚ªA¡Œã‚̐i“W‚ª‘Ò‚½‚ê‚é‚Æ‚±‚낾B

 

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‚P‚T. ƒfƒ“ƒo[‚̏¬Ž™Šà

 

ƒAƒƒŠƒJ‚̏¬Ž™Šà‚ÉŠÖ‚·‚é‰uŠwŒ¤‹†‚̏Љî‚Å‚·B

BEMS2000
‘‰ï‚Å”­•\‚µ‚½˜_•¶‚ÌŠT—vB
˜_•¶–¼FCombined Exposure to High Levels of Air Pollution and Electromagnetic Fields May Increase Leukemia and Other Cancer Risk in Children. 
Œ¤‹†ŽÒFH. Wachtel, R. L. Pearson. 

ŠT—vF
ƒRƒƒ‰ƒhBƒfƒ“ƒo[‚̏¬Ž™Šà‚Æ‘—“dü—R—ˆ‚ÌŽ¥ŠE‚Æ‚ÌŠÖŒW‚ÍWertheimer‚É‚æ‚Á‚Ä1979”N‚É”­•\‚³‚ꂽBSavitz‚É‚æ‚Á‚Ä‚àŒŸØ‚ªs‚í‚ꂽB  ¡‰ñSavitz‚̃f[ƒ^‚ðŠî‚ɉðÍ‚µ‚½B

‘—“dü‚ÌŽí—Þ‚â‹——£‚È‚Ç‚©‚ç’è‚߂郏ƒCƒ„ƒR[ƒh‚ƁA‹ß‚­‚ð’Ê‚éŽÔ‚ÌŒð’Ê—Ê‚Æ‚ªd‚Ȃ荇‚Á‚﬎™Šà‚𑝔­‚³‚¹‚Ä‚¢‚éB

‚P“ú‚ÌŽÔ‚ÌŒð’Ê—Ê‚ª‚Q–œ‘ä‚ð’´‚¦‚é‚©’´‚¦‚È‚¢‚©‚Å•ª—Þ‚µ‚½B ‘—“dü‚̉e‹¿‚̓ƒCƒ„ƒR[ƒh‚Łu‹­‚¢v‚©uŽã‚¢v‚©A‚Q•ª‚µ‚½B

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ŽÔ‚ÌŒð’Ê—Ê‚ª‚Q–œ‘ä‚ð’´‚¦‚¸A‚©‚A‘—“dü‚̉e‹¿‚ªuŽã‚¢vŽž‚É”ä‚ׂÄ
ŽÔ‚ÌŒð’Ê—Ê‚ª‚Q–œ‘ä‚ð’´‚¦A‚©‚A‘—“dü‚̉e‹¿‚ªu‹­‚¢vŽž‚Í
@¬Ž™Šà‚́@ƒIƒbƒY”ä‚Í4.77 (CI‚Å 2.25-10.09)‚Å‚ ‚Á‚½B
‚±‚̐”Žš‚ÍCI‚̉ºŒÀ‚ª1‚ð’´‚¦‚Ä‚¨‚èA“Œv“I‚É‚Í‚»‚ê‚È‚è‚É—LˆÓ‚ÈŒ‹‰Ê‚Å‚ ‚éB

ŽÔ‚ª‘½‚­‚Ä‚à‘—“dü‚̉e‹¿‚ªuŽã‚¢vŽž‚àA
‘—“dü‚̉e‹¿‚ªu‹­‚¢vŽž‚Å‚àAŽÔ‚ª­‚È‚¢Žž‚́A¬Ž™Šà‚̊댯“x‚Í‘‰Á‚µ‚È‚¢B

‚±‚Ì‚±‚Æ‚©‚çA
Œ¤‹†ŽÒ‚́AŽÔ‚Ì”r‹CƒKƒX‚©‚ço‚éƒxƒ“ƒ[ƒ“‚È‚Ç‚Ì”­‚ª‚ñ•¨Ž¿‚ª¬Ž™Šà‚ð‹N‚±‚µA‘—“dü‚©‚ç‚ÌŽ¥ŠE‚Í‚»‚ÌŠà‚𑣐i‚µ‚Ä‚¢‚é‚Ì‚Å‚Í‚È‚¢‚©‚ƁAl‚¦‚Ä‚¢‚éB

‚±‚ê‚Í”ñí‚É–Ê”’‚¢Œ¤‹†‚Å‚·B@‹»–¡‚Ì‚ ‚é•û‚ÍŒ´’˜‚ð“Ç‚ñ‚Å‚­‚¾‚³‚¢B

 

•Åƒgƒbƒv‚Ö–ß‚é

 

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‚P‚UDGurney‚Ì’áŽü”gŽ¥ŠE‚ÆŽq‹Ÿ‚Ì”]Žîᇂ̌¤‹†@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý‚Ì“üŽè‚Å‚·B@ì¬F@‚Q‚O‚O‚R|‚P|‚P‚T@@‰¼–ó‚ð‚‚¯‚½B

ŒfÚŽGŽF@American Journal of Epidemiology, Vol 143, Issue 2 120-128, 1996 @

˜_•¶–¼FChildhood brain tumor occurrence in relation to residential power line configurations, electric heating sources, and electric appliance use@
ZŠÂ‹«‚É‚¨‚¯‚é‘—“düA“d”Mƒxƒbƒh‚ȂǁA‰Æ’ë“dŠí»•i‚ÌŽg—p‚ÆŽq‹Ÿ‚Ì”]Žîᇂ̊֌W@

Œ¤‹†ŽÒFJG Gurney, BA Mueller, S Davis, SM Schwartz, RG Stevens and KJ Kopecky @
Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, Seattle, WA, USA. @

ŠT—v‚ÌŠT—vF@
To assess the relation between childhood brain tumor occurrence and exposure to potential sources of residential magnetic fields, a population-based case-control study of incident brain tumors was conducted in the Seattle, Washington, area at the Fred Hutchinson Cancer Research Center from 1989 to 1994 among children younger than age 20 years who were diagnosed from 1984 to 1990.
@
ƒAƒƒŠƒJ‚̃VƒAƒgƒ‹‚ƃƒVƒ“ƒgƒ“‚ōs‚Á‚½Œ¤‹†AZŠÂ‹«‰º‚É‚¨‚¯‚鎥ŠE–\˜I‚ª20ÎˆÈ‰º‚ÌŽq‹Ÿ‚Ì”]Žîᇂ𑝉Á‚³‚¹‚é‚©‚ðŒ¤‹†B@‚P‚X‚W‚S|‚P‚X‚X‚O”N‚É”]ŽîᇂƐf’f‚³‚ꂽÇ—á‚ð—p‚¢‚½Ç—á‘Ώƌ¤‹†‚µ‚½B@

The specific aims were to evaluate whether proximity to high-current residential power lines, as defined by the Wertheimer-Leeper code, or use of electric appliances or electric heating sources by the mother while pregnant or by the child before diagnosis were associated with increased risks of brain tumor occurrence.
“düƒR[ƒh‚Æ‚ÌŠÖŒWA“d‹C‹@Ší‚ÌŽg—pA“d”Mƒxƒbƒh‚È‚Ç‚ÌŽg—p‚Æ‚ÌŠÖŒW‚ðŒ¤‹†B@

The mothers of 133 cases and 270 controls (recruited by random digit dialing) participated.
133
l‚̏Ǘá‚Æ270l‚Ì‘ÎÆ‚ðŒ¤‹†‘ΏۂƂµ‚½B@

Risk of brain tumor occurrence did not increase with increasing exposure, as indicated by the five-level Wertheimer-Leeper code.
@
Ž¥ŠE–\˜I‹­“xA“düƒR[ƒh‚Æ”]Žîᇑ‰Á‚̃ŠƒXƒN‚Í‚È‚©‚Á‚½B@

When exposure was dichotomized as high versus low, the odds ratio was 0.9 (95% confidence interval 0.5- 1.5) and did not vary significantly by sex, age, or histology.
@
–\˜I‹­“x‚̑召‚ÅŒ©‚é‚ƁAƒIƒbƒY”ä‚Í0.9i‚b‚h@‚OD‚T|‚PD‚Tj‚Å‚ ‚èA«‚â”N—î‚È‚Ç‚ÅŒ©‚Ä‚àˆÙí‚ÈŠÖŒW‚ÍŒ©o‚¹‚È‚©‚Á‚½B@

No elevations in risk were found for ever versus never-use of electric blankets, water beds, or electric heating sources.
@
“d‹C–Ñ•zA“d”Mi…jƒxƒbƒhA“d”MŒ¹‚ÌŽg—pA•sŽg—p‚Å‚à·ˆÙ‚Í‚È‚©‚Á‚½B@

Odds ratios were slightly elevated for nine appliances and were at or below 1.0 for eight others.
@
9
‚‚̓d‹C‹@Ší‚Æ‚ÌŠÖŒW‚ł́AƒIƒbƒY”ä‚̂킸‚©‚ȏ㏸‚ÍŒ©‚ç‚ꂽB8‚‚̋@Ší‚ł̓IƒbƒY”ä‚Í‚P’ö“x‚©‚»‚êˆÈ‰º‚Å‚ ‚Á‚½B

These data do not support the hypothesis that exposure to magnetic fields from high-current power lines, electric heating sources, or electric appliances is associated with the subsequent occurrence of brain tumors in children.
@
‚±‚ÌŒ¤‹†Œ‹‰Ê‚́AZŠÂ‹«‰º‚É‚¨‚¯‚é‘—“düA“d”M‹@Ší‚ÌŽg—pA‰Æ’ë“dŠí»•i‚©‚ç‚ÌŽ¥ŠE‚ªŽq‹Ÿ‚Ì”]Žîᇂ𑝉Á‚³‚¹‚é‚Æ‚¢‚¤‰¼à‚ðŽwŽ¦‚µ‚È‚¢B@

ˆÈã@@@@‹»–¡‚Ì‚ ‚é•û‚́AŒ´’˜˜_•¶‚ð“Ç‚ñ‚Å‚­‚¾‚³‚¢B

•Åƒgƒbƒv‚Ö–ß‚é

 

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‚P‚VDƒmƒ‹ƒEƒF[‚Ì“d‹C“S“¹‚É‚æ‚éŠà‚Ì‘‰Á@1994”N@@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý‚v‚d‚a‚©‚ç“üŽè@@‰¼–ó‚ð‚‚¯‚Ü‚µ‚½B@@@@@ì¬F@‚Q‚O‚O‚R|‚P|‚P‚T@

ŒfÚŽGŽF@American Journal of Epidemiology, Vol 139, Issue 7 645-653, 1994
˜_•¶F@Article:Leukemia and brain tumors in Norwegian railway workers, a nested case- control study@@ƒmƒ‹ƒEƒF[‚Ì“S“¹]‹Æˆõ‚ð‘ΏۂƂµ‚½”’ŒŒ•aE”]Žîᇂ̏Ǘá‘Ώƌ¤‹†@

Œ¤‹†ŽÒF@T Tynes, H Jynge and AI Vistnes @
Cancer Registry of Norway, Institute of Epidemiological Cancer Research, Oslo.
@

ŠT—vF@
In an attempt to assess whether exposure to electromagnetic fields on Norwegian railways induces brain tumors or leukemia, the authors conducted a nested case-control study of railway workers based on incident cases from the Cancer Registry of Norway in a cohort of 13,030 male Norwegian railway workers who had worked on either electric or non-electric railways.

ƒmƒ‹ƒEƒF[“S“¹]‹Æˆõ‚ª“dŽ¥ŠE–\˜I‚É‚æ‚Á‚Ä”]Žîᇂ┒ŒŒ•a‚̃ŠƒXƒN‚ª‚ ‚é‚©Aƒmƒ‹ƒEƒF[‚ÌŠà“o˜^‚ð—˜—p‚µ‚āA“S“¹‰ïŽÐ‚Å“d‹C“S“¹‚Æ”ñ“d‹C“S“¹iƒW[ƒ[ƒ‹‹@ŠÖŽÔ‚âö‹C‹@ŠÖŽÔ‚̉^“]‚ɏ]Ž–‚·‚邱‚ƁHj‚̏]Ž–ŽÒ‡Œv13030–¼‚Ì’j«‚ð‘ΏۂƂµ‚āAÇ—á‘Ώƌ¤‹†‚ðs‚Á‚½B@

The cohort comprised railway line, outdoor station, and electricity workers. @
The case series comprised 39 men with brain tumors and 52 men with leukemia (follow-up, 1958-1990). Each case was matched on age with four or five controls selected from the same cohort.
@

‚±‚̃Rƒz[ƒg‚Í“S“¹ü˜HA‰®ŠO‚̍ì‹ÆêA“düì‹ÆŽÒ‚È‚Ç‚©‚ç\¬‚³‚ê‚Ä‚¢‚éB@
1958
”N‚©‚ç1990”N‚ÌŠÔ‚Å30–¼‚ª”]ŽîᇂɁA52–¼‚ª”’ŒŒ•a‚É‚È‚Á‚Ä‚¢‚éBÇ—á1‚ɑ΂µ‚āA‚S‚©‚ç5–¼‚̑ΏƂð‘I‘ð‚µ‚½B

The exposure of each study subject to electric and magnetic fields was evaluated from cumulative exposure measures based on present measurements and historical data.@

“dŽ¥ŠE‚Ì–\˜I•]‰¿‚́AÅ‹ß‚Ì‘ª’è‚ƉߋŽ‚Ì—š—ð‚©‚çA—ݐς̓dŽ¥ŠE–\˜I—ʂōs‚Á‚½B

Limited information on potential confounders such as creosote, solvents, and herbicides was also collected; information on whether the subject had smoked was obtained by interviews with the subjects or work colleagues.
@

ƒNƒŒƒIƒ\[ƒg‚â—nÜ‚ÌŽg—p‚Ȃǂ̌𗍈öŽq‚ÉŠÖ‚·‚éî•ñ‚àŽûW‚µ‚½B‘Ώێ҂̋i‰Œ‚ÉŠÖ‚µ‚Ä‚àî•ñ‚ðŽûW‚µ‚½B@

The case-control analysis showed that men employed on electric railways, compared with non-electric ones, had an odds ratio for leukemia of 0.70 (adjusted for smoking) and an odds ratio for brain tumor of 0.87. @

”ñ“d‹C“S“¹‚ւ̏]Ž–‚É”äŠr‚µ‚āA“d‹C“S“¹•”–å‚ł̏]Ž–‚É‚æ‚郊ƒXƒN‚́A”’ŒŒ•a‚ÉŠÖ‚µ‚Ă̓IƒbƒY”䂪0.7A”]ŽîᇂɊւµ‚Ä‚Í‚OD‚W‚V‚Å‚ ‚Á‚½B@

No significant trend was shown for exposure to either magnetic or electric fields. These results do not support an association between exposure to 16 2/3- Hertz electric or magnetic fields and the risk for leukemia or brain tumors.

“d‹C“S“¹‚ÅŽg—p‚µ‚Ä‚¢‚é16.67‚g‚š‚Ì“dŽ¥ŠE‚É‚æ‚é”’ŒŒ•a‚Æ”]Žîᇂ̃ŠƒXƒN‘‰Á‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

ˆÈã@‹»–¡‚Ì‚ ‚é•û‚́AŒ´’˜‚Ì‘S•¶‚ð“üŽè‚µ‚Ä“Ç‚ñ‚Å‚­‚¾‚³‚¢B


•Åƒgƒbƒv‚Ö–ß‚é

 

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‚P‚WDƒfƒ“ƒ}[ƒN‚Ì“d—͏]Ž–ŽÒ‚ÌŽ¥ŠE–\˜I‚Æ”­ƒKƒ“ƒŠƒXƒN@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚ð“üŽè‚µ‚Ü‚µ‚½B@‰¼–ó‚ð‚‚¯‚Ü‚µ‚½B@@ì¬F@‚Q‚O‚O‚R|‚P|‚P‚U@

ŒfÚŽGŽFAmerican Journal of Epidemiology, Vol 147, Issue 6 548-555, 1998
˜_•¶FRisk of cancer among Danish utility workers--a nationwide cohort study@
ƒfƒ“ƒ}[ƒN‘S“y‚ð‘ΏۂƂµ‚½ƒfƒ“ƒ}[ƒN‚Ì“d—ÍŽ–‹Æ]Ž–ŽÒ‚Ì”­ƒKƒ“ƒŠƒXƒN‚ÉŠÖ‚·‚éƒRƒz[ƒgŒ¤‹†@

Œ¤‹†ŽÒFC Johansen and JH Olsen
Danish Cancer Society, Division for Cancer Epidemiology, Copenhagen.
@

ŠT—v@
The authors report the incidence of cancer in a large cohort of employees identified from all 99 Danish utility companies.
@
ƒfƒ“ƒ}[ƒN‚É‚ ‚é‚X‚X‚Ì‘S‚Ä‚Ì“d—͉ïŽÐ‚ð‘ΏۂƂµ‚āA”­ƒKƒ“ƒŠƒXƒN‚ÉŠÖ‚µ‚Ä‘å‹K–͂ȃRƒz[ƒgŒ¤‹†‚ðs‚Á‚½B@

Personal data and information on employment and exposure to magnetic fields and asbestos were obtained from manual files at the companies, the Danish Supplementary Pension Fund, and the public payroll administration.
ŒÂlî•ñAŽ¥ŠE–\˜IAƒAƒXƒxƒXƒg‚Ö‚Ì–\˜I‚Ȃǂ̏î•ñ‚ð“üŽè‚µ‚½B@

A total of 32,006 individuals with more than 3 months of employment were linked with the files of the Danish Cancer Registry.
@
‚Rƒ–ŒŽˆÈã“d—͉ïŽÐ‚ɋΖ±‚µ‚½‚±‚Æ‚Ì‚ ‚é32000–¼‚ðAƒfƒ“ƒ}[ƒN‚ÌŠà“o˜^‚ÉŒ‹‚Ñ•t‚¯‚½B@

The period of follow-up for cancer occurrence among the employees was from April 1968 through December 1993 in the study conducted from 1994 to 1997.
@
1968
”N4ŒŽ‚©‚ç1993”N12ŒŽ‚Ü‚Å‚ÌŠúŠÔ‚ÉŠà‚É‚È‚Á‚½l‚ð‘Ώۂɂµ‚½B

Overall, 3,008 cancers were observed, with 2,825 expected, yielding a small but significantly increased risk of 1.06 (95% confidence interval 1.03-1.10) among the utility workers in comparison with the general population. 
Œ‹‰ÊAˆê”Ê•½‹Ï‚Æ”ä‚ׂé‚ƁAŠú‘Ò’l2825Œ‚ɑ΂µ‚āAŠà‚Æ‚µ‚ÄŠÏŽ@‚³‚ꂽŒ”‚Í3008Œ‚ŏ­‚È‚¢‚ªA—LˆÓ‚È”­ƒKƒ“—¦‚Ì‘‰Á‚ª‚ ‚Á‚½B

No excess was observed for all leukemias or for cancers of the brain or breast among men or women.
”’ŒŒ•a‚âA”]ŽîᇁA“û–[‚ÌŠà‚ɑ΂µ‚ẮAƒŠƒXƒN‚Ì‘‰Á‚Í‚È‚©‚Á‚½B

There was no association of electromagnetic field exposure with risk of these cancers, even when the level and length of exposure to magnetic fields were taken into account.
Ž¥ŠE‚Ì‹­“x‚â–\˜I‚µ‚Ä‚¢‚½ŠúŠÔ‚È‚Ç‚ðl—¶‚µ‚Ä‚àAŽ¥ŠE–\˜I‚Æ”­ƒKƒ“ƒŠƒXƒN‚Ì‘‰Á‚ÍŠÖŒW‚È‚©‚Á‚½A

Increased risks for cancers of the lung and pleural cavity (
‹¹–Œ‚̋󓴁H@‹CŠÇŽx‚Ì‚±‚ƁH)@were seen mainly for workers whose jobs involved exposure to asbestos. 
ƒAƒXƒxƒXƒg‚Ö‚Ì–\˜I‚É”º‚¤”x‚ª‚ñ‚È‚Ç‚Ì‘‰Á‚ÍŠÏŽ@‚³‚ꂽB

The results from this study do not support the hypothesis of an association between occupational exposures to magnetic fields in the electric utility industry and the risk for cancer. 
‚±‚ÌŒ¤‹†‚ÌŒ‹‰Ê‚́A“d—͉ïŽÐ‚̏]‹Æˆõ‚ªŽ¥ŠE‚É–\˜I‚·‚邱‚Æ‚É‚æ‚Á‚Ä”­ƒKƒ“ƒŠƒXƒN‚ª‘‰Á‚·‚é‚Æ‚¢‚¤‰¼à‚ðŽxŽ‚µ‚È‚¢B


@@•Åƒgƒbƒv‚Ö–ß‚é

 

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‚P‚XD‰Æ“d»•i‚ÌŽg—p‚Æ‘ål‚Ì”’ŒŒ•a‚̃ŠƒXƒN@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@ì¬F‚Q‚O‚O‚R|‚P|‚P‚U@‰¼–ó‚ð‚‚¯‚Ü‚µ‚½B@

ŒfÚŽFAmerican Journal of Epidemiology, Vol 140, Issue 6 510-517, 1994 @

˜_•¶–¼FAdult leukemia risk and personal appliance use: a preliminary study @
‰Æ“d»•i‚Æ‘ål‚Ì”’ŒŒ•a‚̃ŠƒXƒN‚ÉŠÖ‚·‚é—\”õ’²¸@

Œ¤‹†ŽÒFRH Lovely, RL Buschbom, AL Slavich, LE Anderson, NH Hansen and@BW Wilson
Pacific Northwest Laboratory, Richland, WA
@

ŠT—v@
The hypothesis that use of personal electric appliances may be associated with increased risk of acute nonlymphocytic leukemia in adults was tested using interview data from a previously completed case- control study of 114 cases and 133 controls conducted between 1981 and 1984.

‰Æ“d»•i‚ÌŽg—p‚ª”’ŒŒ•a‚𑝉Á‚·‚é‚Æ‚¢‚¤‰¼à‚ðA1981|1984”N‚ɁA114–¼‚̏Ǘá‚Æ133–¼‚̑ΏƌQ‚ð‘Ώۂɂ¨‚±‚È‚Á‚½‰ß‹Ž‚̃Cƒ“ƒ^ƒrƒ…[’²¸ƒf[ƒ^‚ðŽg—p‚µ‚āAŒŸ“¢‚µ‚½B

Cases were obtained from a population-based cancer registry in western Washington state, and controls were obtained from the same area by random digit dialing. @

Ç—á‚͐¼•”ƒƒVƒ“ƒgƒ“B‚É‚¨‚¯‚éŠà“o˜^‚©‚çA‘ΏƂ̓‰ƒ“ƒ_ƒ€ƒ_ƒCƒ„ƒ‹“d˜b‚Å“¾‚½B

Of 32 electrical home appliances for which data on use were available for adult acute nonlymphocytic leukemia cases and controls, three motor-driven personal appliances (electric razors, hair dryers, and massage units) were selected a priori because their use represents exposure to higher peak magnetic fields than that from most other home appliances.

32‚̉Ɠd»•i‚ÌŽg—pó‹µ‚̃f[ƒ^‚𓾂½Bƒ‚[ƒ^‚Å“®‚­3‚‚̉Ɠd»•ii“d‹C‚©‚Ý‚»‚èAƒwƒAƒhƒ‰ƒCƒ„[Aƒ}ƒbƒT[ƒWŠíj

‚Í‘¼‚Ì‹@Ší‚æ‚è‹­‚¢ƒs[ƒNŽ¥ŠE‚𔭐¶‚·‚邱‚Æ‚©‚çA’–Ú‚µ‚ÄŒŸ“¢‚µ‚½B@

When compared on an "ever used" versus "never used" basis, use of one or more of these appliances was not associated with increased risk of leukemia in the population studied (odds ratio (OR) = 0.71, 95% confidence interval (CI) 0.41-1.24). @

‚±‚ê‚ç‚Ì‹@Ší‚ÌŽg—pA•sŽg—p‚Æ”’ŒŒ•a‚̃ŠƒXƒN‘‰Á‚ÉŠÖ‚µ‚āAƒIƒbƒY”ä‚Í‚OD‚V‚P‚Å‚ ‚Á‚½B@

When the appliances were considered individually, massage units were more likely to have been used by cases than by controls (OR = 3.00, 95% CI 1.43-6.32), while hair dryers were more likely to have been used by controls than cases (OR = 0.38, 95% CI 0.22-0.66). @

ŒÂX‚Ì‹@Ší‚ÉŠÖ‚µ‚Ä‚Ý‚ê‚΁Aƒ}ƒbƒT[ƒWŠí‚ÌŽg—p‚͏ǗáŒS‚É‘½‚­AƒwƒAƒhƒ‰ƒCƒ„[‚͑ΏƌS‚Å‘½‚©‚Á‚½B@

There was a nonsignificant tendency for electric razor use to differentiate the cases from controls (OR = 1.33, 95% CI 0.80-2.23). @

“d‹C‚©‚Ý‚»‚è‚ÌŽg—p‚ÉŠÖ‚µ‚ẮA“ÁˆÙ‚ÈŒXŒü‚Í‚È‚©‚Á‚½B@

When reported daily time of use was stratified, there was no overall increased risk with increased time of use except for electric razors (p < 0.05). @

“úX‚ÌŽg—p•p“x‚ōl‚¦‚é‚ƁA“d‹C‚©‚Ý‚»‚è‚ÌŽg—p‚ðœ‚¯‚΁AŽg—p•p“x‚Ì‘‰Á‚É‚æ‚郊ƒXƒN‚Ì‘‰Á‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

In addition to the analysis of appliance use data from the case-control study, the authors obtained several models of these motor-driven personal appliances and characterized the magnetic fields they produce. @

Ç—á‘ΏƌS‚©‚ç‚̃f[ƒ^ˆÈŠO‚ɁA‹@Ší‚ÌŽ¥ŠE˜R‰k‚Ȃǂ̃f[ƒ^‚ð“üŽè‚µ‚½B@

Magnetic field flux density, or the B-field, and spectral measurements showed that partial body exposure from such appliances may exceed 0.5 mTesla (root mean squared) at rates-of-change exceeding 10 Tesla/sec.@

‚±‚¤‚µ‚½ƒf[ƒ^‚É‚æ‚ê‚΁Al‘Ì‚ª•”•ª“I‚É–\˜I‚·‚鎥ŠE‚Ì‹­‚³‚Í0.5mTi5ƒKƒEƒXj‚ð’´‚¦AŽžŠÔ•Ï“®’l‚Í‚P‚OƒeƒXƒ‰^•b‚ð’´‚¦‚éB@

These epidemiologic data must be interpreted cautiously because the number of cases is limited and because of proxy reporting of appliance use for deceased cases. @

Œ¤‹†‘ΏۂƂµ‚½Ç—ᐔ‚ªŒÀ’肳‚ê‚Ä‚¢‚é‚̂ŁA‚±‚̈ՊwŒ¤‹†‚ÌŒ‹‰Ê‚́A’ˆÓ‚µ‚āAŽæ‚舵‚¤•K—v‚ª‚ ‚éB@

Nevertheless, the authors believe these data indicate that peak magnetic field exposure from personal appliances warrants further investigation as a possible risk factor for acute nonlymphocytic leukemia in adults. @

‰Æ“d»•i‚©‚ç‚̃s[ƒNŽ¥ŠE˜R‰k‚́A¡Œã‚Ì–ð”öŠw’²¸‚É‚¨‚¢‚āAŒŸ“¢‚³‚ê‚é‚ׂ«‚Å‚ ‚éB@

ˆÈã‚É‚ ‚é‚悤‚ɁA—\”õ’²¸‚Ì’iŠK‚Å‚ ‚邪A‰Æ“d»•i‚©‚ç‚ÌŽ¥ŠE‚É‚æ‚é‘ål‚Ì”’ŒŒ•a‚Ì‘‰Á‚̃ŠƒXƒN‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½‚Æ‚¢‚¤•ñ‚Å‚·B@

‹»–¡‚Ì‚ ‚é•û‚ÍŒ´’˜‚Ì‘S•¶‚ð“üŽè‚µ‚āA“Ç‚ñ‚Å‚­‚¾‚³‚¢B

•Åƒgƒbƒv‚Ö–ß‚é

 

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‚Q‚ODƒtƒ‰ƒ“ƒX“d—͉ïŽÐ]‹Æˆõ‚Ì“dŠE–\˜I‚Æ”­ƒKƒ“‚ÌŒ¤‹†@@


ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½@@@ì¬F@‚Q‚O‚O‚R|‚P|‚P‚X@

ŒfÚŽ†FAmerican Journal of Epidemiology, Vol 144, Issue 12 1107-1121, 1996 @

˜_•¶–¼FExposure to 50-Hz electric field and incidence of leukemia, brain tumors, and other cancers among French electric utility workers @
ƒtƒ‰ƒ“ƒX‚Ì“d—͏]Ž–ŽÒ‚ð‘ΏۂƂµ‚½50Hz“dŠE–\˜I‚ÆŠà‚ÌŒ¤‹†@

Œ¤‹†ŽÒFP Guenel, J Nicolau, E Imbernon, A Chevalier and M Goldberg @
Institut National de la Sante et de la Recherche Medicale-Unite 88, Hopital National de Saint-Maurice, France.

ŠT—vF@
Recent studies on the association between exposure to 50- to 60-Hz fields and cancer carried out among electric utility workers have focused mainly on the magnetic field component of exposure.
@
Å‹ß‚Ì“d—ÍŽ–‹Æ]Ž–ŽÒ‚ð‘ΏۂƂµ‚½50/60Hz“dŽ¥ŠE–\˜I‚Æ”­ƒKƒ“ƒŠƒXƒN‚ÌŒ¤‹†‚́AŽå‚ÉŽ¥ŠE‚ɂ‚¢‚ÄŒ¤‹†‚ªs‚È‚í‚ê‚Ä‚¢‚éB

The authors have investigated tumor risks specifically associated with electric fields, as this exposure is distinct(
ˆÙ‚È‚é) from magnetic fields. @
–{Œ¤‹†‚́AŽ¥ŠE–\˜I‚ƈقȂé“dŠE‚Æ”­ƒKƒ“‚ÌŒ¤‹†‚Å‚ ‚éB@

The study design is a case-control study nested within a cohort of 170,000 workers employed at Electricite de France-Gaz de France (EDF) between 1978 and 1989.
ƒtƒ‰ƒ“ƒX“d—́iEDFj‚É1978”N‚©‚ç1989”N‚ɋΖ±‚µ‚½17–œl‚̏W’c‚Ì’†‚ŁAÇ—á‘Ώƌ¤‹†‚ð‚¨‚±‚È‚Á‚½B@

All incident cases of cancer and benign
i—ǐ«‚́j tumor of the brain diagnosed in 1978-1989 among workers before the age of retirement were included.@@
1978
”N‚©‚ç1989”N‚̊ԂŁA‘ސE‘O‚ÉŠà‚Ɛf’f‚³‚ꂽA—ǐ«‚Ì”]ŽîᇂðŠÜ‚Þ‘S‚Ä‚ÌŠà‚̏Ǘá‚ðŽûW‚µ‚½B@

Four randomly selected controls were individually matched to each case by year of birth.
¶”N‚ðƒ}ƒbƒ`‚³‚¹‚āA‘ΏƌS‚ð‘I‘ð‚µ‚½B@

The exposure to electric fields was assessed from measurements collected in 850 EDF workers for a full work week.
@
“dŠE‚Ö‚Ì–\˜I‚̏ó‘Ô‚Í860l‚̏]‹Æˆõ‚ð‘Ώۂɑª’è•]‰¿‚ðs‚È‚Á‚½B@

Arithmetic and geometric mean exposures were included in a job-exposure matrix to determine the cumulative exposure of the cases and the controls.
@
‘ΏƌSAÇ—áŒQ‚Æ‚à‚ɁA—ݐϖ\˜I—ʁiŽZp•½‹ÏAŠô‰½•½‹Ï‚Æ‚à‚Ɂj‚ÅJOBƒ}ƒgƒŠƒbƒNƒX‚ðì¬‚µ‚½B@

Exposures to potentially carcinogenic chemicals found at the workplace were also evaluated through expert judgment.
@
Eê‚É‚ ‚é‚»‚Ì‘¼‚Ì”­‚ª‚ñ«•¨Ž¿‚̉e‹¿‚́Aê–å‰Æ‚É‚æ‚Á‚Ä•]‰¿‚³‚ꂽB@

The analysis by site of tumor did not show any increased risk for leukemia (72 cases).
@
72
‚̏Ǘá‚Ì‚ ‚Á‚½”’ŒŒ•a‚ÉŠÖ‚µ‚ẮA”­¶•”ˆÊ‚Æ“dŠE–\˜I‚Æ‚ÍŠÖŒW‚ª‚È‚©‚Á‚½B@

An odds ratio of 3.08 (95% confidence interval 1.08-8.74) was observed for all brain tumors (69 cases) for exposure above the 90th percentile (> or = 387 V/m-year), and there was some indication of a dose-response relation, although the risk did not increase monotonically with exposure.
@
69
‚̏ǗႪ‚ ‚Á‚½”]ŽîᇂɊւµ‚ẮA387V/mˆÈã‚Ì‹­‚¢“dŠE‚É–\˜I‚µ‚Ä‚¢‚é90ƒp[ƒZƒ“ƒ^ƒCƒ‹‚̐l‚̊Ԃł́AƒIƒbƒY”䂪3.08 ( CI: 1.08-6.74)‚Å‚ ‚Á‚½B‚»‚µ‚āA–\˜I‚ɑ΂µ‚Ä’P’²‚É‘‰Á‚ÆŒ¾‚¤–ó‚Å‚Í‚È‚¢‚ªA‚킸‚©‚ȗʁ\”½‰žì—p‚ªŠÏ‘ª‚³‚ꂽB@

No confounding from magnetic fields or from other potentially carcinogenic hazards was apparent.
@
Ž¥ŠE‚̉e‹¿A‚»‚Ì‘¼‚Ì”­‚ª‚ñ«•¨Ž¿‚̉e‹¿‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

The observed association was somewhat stronger after allowing a 5-year latency period
iö•šŠúj before diagnosis (odds ratio = 3.69, 95% confidence interval 1.10-12.43) for exposure above the 90th percentile. @
Šà‚Ɛf’f‚³‚ê‚é‘O‚É5”N‚̐ö•šŠúŠÔ‚ð‘z’è‚·‚é‚ƁAã‹LƒIƒbƒY”ä3.08‚Æ‚¢‚¤”Žš‚̓IƒbƒY”ä3.69‚É‘‰Á‚·‚éB@

However, the risk of brain tumor could not be linked to a specific type of tumor.
@
“Á’è‚ÌŽí—Þ‚Ì”]ŽîᇂƂ̊֘A‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

An unexpected association was also observed for colon
iŒ‹’°j cancer, using geometric indexes of exposure, but no other association was seen for any other type of cancer.
—\‘z‚µ‚È‚©‚Á‚½‚±‚Æ‚Å‚ ‚邪AŠô‰½“I•½‹Ï’l‚Ì–\˜I—Ê‚ÆŒ‹’°Šà‚ÌŠÖŒW‚ªŒ©‚‚©‚Á‚½B‚»‚Ì‘¼‚ÌŠà‚Æ‚ÌŠÖ˜A‚Í‚È‚©‚Á‚½B@

Our study indicates that electric fields may have a specific effect on the risk of brain tumor, and that this should be taken into account in future analyses on the carcinogenic effects of 50- to 60-Hz fields.
@
‚±‚ÌŒ¤‹†‚ŁA“dŠE–\˜I‚ª”]ŽîᇂɊ֘A‚µ‚Ä‚¢‚邱‚Æ‚ª‚í‚©‚èA¡Œã‚ÌŒ¤‹†‚ł́A50Hz,60Hz‚Ì“dŽ¥ŠE‚Æ”­ƒKƒ“‚ÌŒ¤‹†‚ɂ́A“dŠE‚̉e‹¿‚à‰Á–¡‚µ‚È‚¯‚ê‚΂Ȃç‚È‚¢B@

ˆÈã@@@‹»–¡‚Ì‚ ‚é•û‚ÍŒ´’˜‚Ì‘S•¶‚ð“üŽè‚µ‚āA“Ç‚ñ‚Å‚­‚¾‚³‚¢B@@

 

•Åƒgƒbƒv‚Ö–ß‚é

 

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‚Q‚PDKeifets‚Ì1997”N‚̐E‹Æ“I‚È“dŠE–\˜I‚Æ”’ŒŒ•a‚Ƃ̉uŠwŒ¤‹†@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý‚Ì“üŽèB‰¼–ó‚ð‚‚¯‚½B@ì¬F@‚Q‚O‚O‚R|‚P|‚P‚W@

ŒfÚŽGŽFAmerican Journal of Epidemiology, Vol 146, Issue 1 87-90, 1997 @

˜_•¶–¼FLeukemia risk and occupational electric field exposure in Los Angeles County, California@
ƒJƒ‹ƒtƒHƒ‹ƒjƒA‚É‚¨‚¯‚éE‹Æ“I‚È“dŽ¥ŠE–\˜I‚Æ”’ŒŒ•a‚̃ŠƒXƒN@

Œ¤‹†ŽÒFLI Kheifets, SJ London and JM Peters @

EMF Health Assessment and Management, Electric Power Research Institute, Palo Alto, CA. USA


ŠT—v:
The authors analyzed data on electric fields from a prior study of occupational magnetic field exposure and leukemia risk conducted in Los Angeles County, California, in 1972-1990.
1972
|1990”N‚̉ߋŽ‚ɍs‚Á‚½Ž¥ŠE‚Æ”’ŒŒ•a‚ÌŒ¤‹†ƒf[ƒ^‚©‚çA “dŠE‚ÉŠÖ‚·‚é‰ðÍ‚ð‚¨‚±‚È‚Á‚½B

Ranking of exposure differed somewhat for magnetic and electric fields.
“dŽ¥ŠE‚Ö‚Ì–\˜I‚ð“K“–‚Ƀ‰ƒ“ƒN‹æ•ª‚ð‚¨‚±‚È‚Á‚½B

The odds ratios were 1.22 (95% confidence interval (CI) 0.80-1.86) and 1.15 (95% confidence interval 0.78-1.72) for medium and high exposure categories, respectively, and there was no clear evidence of an exposure-response relation (odds ratio for 10 V/m increase = 1.05, 95% CI 0.95-1.16).
‚‚¢–\˜IŒQ‚Æ’†’ö“x‚Ì–\˜IŒQ‚̊Ԃł́AƒIƒbƒY”ä‚Í1.22(CI: 0.90-1.86)A“dŠE–\˜I‹­“x‚ª10V/m‘‰Á‚·‚é‚ɂ‚ê‚ăŠƒXƒN‚Ì‘‰Á‚́AƒIƒbƒY”ä‚Å1.05iCI: 0.95-1.16j‚Å‚ ‚Á‚½B

Although not conclusive, our analyses provide little support for an association between occupational electric field exposure and leukemia.
Œ‹˜_‚¯‚é–ó‚É‚Í‚¢‚©‚È‚¢‚ªA‚±‚̉ðÍŒ‹‰Ê‚͐E‹Æ“I‚È’áŽü”g“dŠE‚Ö‚Ì–\˜I‚Æ”’ŒŒ•a‘‰Á‚ÌŠÖ˜A«‚ðŽxŽ‚µ‚È‚¢B@

ˆÈã@

‚±‚̘_•¶‚ÍŒ»Ý‚v‚g‚n‚̍‘Û“dŽ¥”gƒvƒƒWƒFƒNƒg‚Ì“Z‚ß–ð‚ð‚â‚Á‚Ä‚¢‚él‚ÌŒ¤‹†˜_•¶‚Å‚·B ‹»–¡‚Ì‚ ‚é•û‚́A‚±‚ÌŒ¤‹†‚ÌŒ´’˜@‘S•¶‚ð“üŽè‚µ‚Ä“Ç‚ñ‚Å‚­‚¾‚³‚¢B

•Åƒgƒbƒv‚Ö–ß‚é

 

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‚Q‚QDƒCƒMƒŠƒX‚Ì‚m‚q‚o‚a”­s@Doll•ñ‚ÌŠT—v@2001”N


‹»–¡‚Ì‚ ‚é•û‚ÍWEB‚à‚µ‚­‚ÍŒ´’˜‚ðw“ü‚µ‚Ä“Ç‚ñ‚Å‚­‚¾‚³‚¢BˆÈ‰º‚ÍŽ„‚Ì—‰ð‚Å‚«‚½”͈͂ł̊T—v‚Å‚·B

Documents of NRPB Vol.12 No. 1, 2001
ELF Electromagnetic Fields and the Risk of Cancer
@
Report of an Advisory Group on Non-Ionizing Radiation
@
Chairman: Sir R. Doll
@

Œ´–{‚ÍNRPB‚©‚ç30ƒ|ƒ“ƒh‚ōw“ü‰Â”\BŠT—v‚ÍNRPB‚ÌWEB‚É–ÚŽŸ‚ÆŒ‹˜_‚Ì•”•ª‚¾‚¯‚ªŒöŠJ‚³‚ê‚Ä‚¢‚éB
ˆÈ‰º‚Í‚±‚ÌŒöŠJ‚³‚ꂽŠT—v‚ÌŠT—v‚Å‚ ‚éBWEB‚ÌURL‚Í http://www.nrpb.org.uk@@

–‚±‚Ì•ñ‚ÍELFC’áŽü”g‚Ì“dŽ¥ŠE‚ÉŒÀ’è‚·‚é•ñ‚Å‚ ‚éB
–NRPB‚̍ŏ‰‚Ì1992”N‚É”­s‚µ‚½ƒŒƒ|[ƒg‚Å‚às‚Á‚½‚ªA’áŽü”g“dŽ¥ŠE‚ÌŒ’N‰e‹¿‚ÉŠÖ‚µ‚ăŒƒrƒ…[‚ðs‚Á‚½B
–ƒqƒg‚̃Kƒ“‚ÉŠÖ‚µ‚āAE‹Æ“I‚È”˜˜IAZŠÂ‹«‰º‚É‚¨‚¯‚锘˜I‚Ƃ̉uŠw’²¸A×–EŽÀŒ±A“®•¨ŽÀŒ±Aƒqƒg‚ð‘ΏۂƂµ‚½ŽÀŒ±‚ÌŒ‹‰Ê‚ð‚Ü‚Æ‚ß‚½B

–‰ß‹Ž‚ÌŒ¤‹†‚Å‚Í”˜˜I•]‰¿‚Í•s\•ª‚Å‚ ‚Á‚½‚ªAÅ‹ß‚ÌŒ¤‹†‚ł́AŽ¥ŠE”˜˜I•]‰¿‚ª\•ª‚ɍs‚í‚ê‚é‚悤‚É‚È‚Á‚Ä‚«‚Ä‚¢‚éBiŽ„‚̃Rƒƒ“ƒgF‚¾‚©‚ç‰ß‹Ž‚̉uŠwŒ‹‰Ê‚͐M—Š«‚ÉŒ‡‚¯‚é‚Æ‚ÍŒ¾‚Á‚Ä‚¢‚È‚¢‚ªj@

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No Clear evidence, No convincing evidence
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100
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‘S”Ê“I‚ɁANo convincing evidencei–¾Šm‚ȏ؋’‚Í‚È‚¢j‚Æ‚È‚Á‚Ä‚¢‚éB@

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‘Š‘ΓI‚É‹­‚¢Ž¥ŠEA0.4ƒ}ƒCƒNƒƒeƒXƒ‰‚ð’´‚¦‚鎥ŠE‚Ö‚Ì”˜˜I‚ŏ¬Ž™”’ŒŒ•a‚ª2”{‚É‚È‚é‚Æ‚¢‚¤Suggesti’ñ‹cj‚ª‚ ‚éB‚µ‚©‚µAThe evidence, however, not Conclusive.i‚Ü‚¾Œ‹˜_‚Å‚Í‚È‚¢j‚Æ‚È‚Á‚Ä‚¢‚éB

‰p‘‚É‚¨‚¢‚āA0.4ƒ}ƒCƒNƒƒeƒXƒ‰‚ð’´‚¦‚锘˜I‚ðŽó‚¯‚Ä‚¢‚鏬Ž™‚ÌŠ„‡‚Í‘½•ª0.4“’ö“x‚Å‚ ‚낤B

iŽ„‚̃Rƒƒ“ƒgF3ŒŽ23“ú‚ɍs‚í‚ꂽ‘æ3‰ñ“dŽ¥ŠEƒ[ƒNƒVƒ‡ƒbƒv‚É‚¨‚¢‚āAƒJƒƒŠƒ“ƒXƒJŒ¤‹†Š‚̃Iƒ‹ƒ{ƒ“‚́A‚±‚ÌDoll•ñ‚ÉŒ¾‹y‚µ‚Ä‚¢‚éB¡‚Ü‚Å‚ÍŽ¥ŠE‚Ə¬Ž™ƒKƒ“‚ÌŠÖŒW‚ð‘S‚­”F‚ß‚Ä‚¢‚È‚©‚Á‚½‚Ì‚ªA‚±‚Ì•ñ‚ł́A•\Œ»‚ðH•v‚µ‚āA­‚È‚­‚Æ‚à‰Â”\«‚ðŽ¦´‚·‚é‚Æ‚±‚ë‚Ü‚ÅŒ¾‹y‚µ‚Ä‚¢‚é‚Ì‚Í•]‰¿‚Å‚«‚éA‚ƁB@

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‚Q‚RD’áŽü”gŽ¥ŠE‚ÆŠà‚ÌŒ¤‹†iGalloni@2001”Nj

 

Bio@ElectroMagneticsŽ@2000”N12ŒŽ†‚ÉŒfÚ‚³‚ê‚Ä‚¢‚½Œ¤‹†‚Å‚·B
Œ¤‹†ŽÒFP. Galloni@et al:
˜_•¶–¼FEffects of 50 Hz Magnetic Field Exposure on Tumor Experiencal models.

50Hz
@‚Qƒ~ƒŠƒeƒXƒ‰i‚Q‚OƒKƒEƒXj‚ÌŽ¥ŠE‚É‘l‚𔘘IB
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Ž¥ŠE‚É”˜˜I‚µ‚½‘lAŽ¥ŠE‘•’u‚ÅŽ”ˆç‚µ‚½‚ªŽ¥ŠE‚Ì”­¶‚Í–³‚¢‹[Ž—”˜˜IA•’Ê‚ÌŽ”ˆç” ‚ÅŽ”ˆç‚µ‚½ƒRƒ“ƒgƒ[ƒ‹ŠÔ‚ō·ˆÙ‚𒲍¸‚µ‚½B
‚P‚OƒOƒŒƒC‚Æ‚¢‚¤‹­‚¢‚wü‚𔘘I‚³‚¹‚½‘l‚Å‚à’²¸B
Ž¥ŠE‚Ö‚Í1“ú6ŽžŠÔ@T5“úŠÔ”˜˜I‚³‚¹‚½B@

Œ‹‰Ê‚́@
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X
ü‚𔘘I‚µ‚½ŽÀŒ±‚ŁAŽ¥ŠE”˜˜IA‹[Ž—”˜˜IAƒRƒ“ƒgƒ[ƒ‹ŠÔ‚ɍ·ˆÙ‚Í‚È‚­AŽ¥ŠE‚̓vƒƒ‚[ƒ^ì—pi”­ƒKƒ“‚𑣐i‚·‚éì—pj‚ðŽ‚Â‚Æ‚Í‚¢‚¦‚È‚¢B

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‚±‚Ì‚±‚Æ‚©‚çA‰uŠw‚ł͐”ƒ~ƒŠƒKƒEƒX’ö“x‚ÌŽ¥ŠE‚Å‚àŠà‚𑝔­‚·‚邱‚Æ‚ðŽ¦´‚µ‚Ä‚¢‚錤‹†‚ª‚ ‚邪A‚±‚ÌŽÀŒ±‚Í‚P‚O‚O‚O‚O”{‚à‹­‚¢Ž¥ŠE‚É”˜˜I‚µ‚Ä‚¢‚é‚É‚àŠÖ‚í‚炸AŠà‚Ì‘”­‚Í“®•¨ŽÀŒ±‚Å‚ÍŠm”F‚Å‚«‚È‚©‚Á‚½A‚Æ‚µ‚Ä‚¢‚éB

•Åƒgƒbƒv‚Ö–ß‚é

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‚Q‚SDƒXƒCƒX“S“¹]Ž–ŽÒ‚ÌŽ¥ŠE–\˜I‚Æ”’ŒŒ•a@@@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽèB@‰¼–ó‚ð‚‚¯‚½B@@ì¬F@‚Q‚O‚O‚R|‚P|‚P‚W@
ŒfÚŽGŽF@American Journal of Epidemiology Vol. 153, No. 9 : 825-835 2001

˜_•¶–¼F@
Leukemia, Brain Tumors, and Exposure to Extremely Low Frequency Electromagnetic Fields in Swiss Railway Employees
@ƒXƒCƒX‚Ì“S“¹]Ž–ŽÒ‚É‚¨‚¯‚é’áŽü”g“dŽ¥ŠE–\˜I‚Æ”’ŒŒ•aE”]Žîᇁ@

Œ¤‹†ŽÒF@
C. E. Minder and D. H. Pfluger
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From the Institute for Social and Preventive Medicine, University of Berne, Berne, Switzerland

Railway engineers provide excellent opportunities for studying the relation between exposure to extremely low frequency magnetic fields and leukemia or brain tumors.
”’ŒŒ•a‚Æ”]ŽîᇂƒáŽü”gŽ¥ŠE–\˜I‚ÌŠÖŒW‚ɂ‚¢‚āA“S“¹]‹Æˆõ‚ð‘ΏۂɌ¤‹†‚ð‚¨‚±‚È‚Á‚½B@

In a cohort study of Swiss railway personnel with 2.7 x 105 person-years of follow-up (1972–1993), the authors compared occupations with high average exposures (line engineers: 25.9 µT) to those with medium and low exposures (station masters: 1 µT).
27
–œl”N‚Ì‹K–͂ŁAƒXƒCƒX‚Ì“S“¹]‹Æˆõ‚ð‘ΏۂƂµ‚½ƒRƒz[ƒgŒ¤‹†‚ŁA1972”N‚©‚ç1993”N‚ÌŠÔ‚ð’ǐՊúŠÔ‚Æ‚µ‚½B‚‚¢ƒŒƒxƒ‹‚Ì–\˜IŒQiü˜HHA25.9ƒÊTj‚Æ’†’ö“x‚Æ’á‚¢ƒŒƒxƒ‹‚Ì–\˜IŒQi‰w’·EA1ƒÊTj‚ð”ä‚ׂ½B@

The mortality rate ratio for leukemia was 2.4 (95% confidence interval (CI): 1.0, 6.1) among line engineers (reference category: station masters).
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ü˜HH‚Ɖw’·E‚ð”ä‚ׂé‚ƁAü˜HH‚Ì”’ŒŒ•a‚Å‚ÌŽ€–S—¦”ä‚Í2.4iCI 1.0-6.1jB

The mortality rate ratio for brain tumors was 1.0 (95% CI: 0.2, 4.6) among line engineers and 5.1 (95% CI: 1.2, 21.2) among shunting yard engineers (compared with station masters).
“¯—l‚ɁA”]ŽîᇂƂ̊֌W‚ÍŽ€–S—¦”䂪1.0iCI 0.2 - 4.6j‚Å‚ ‚Á‚½‚ªA
•ªŠò“_‚Å“­‚­l‚Ɖw’·E‚ÌŽ€–S—¦”ä‚́A5.1iCI: 1.2 - 21.2j‚Å‚ ‚Á‚½B@
i•MŽÒ‚Ì’F5.1”{‚ÌCI‚ÌŠÔŠu‚ª‘å‚«‚¢‚̂ŁAÇ—ᐔ‚ª­‚È‚¢Hj@

Two exposure characteristics were evaluated: cumulative exposure in µT-years and years spent under exposure to magnetic fields of > or = 10µT.
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—ݐσÊTE”N’l‚ƁA10ƒÊTˆÈã‚É–\˜I‚µ‚½”N”‚ð‘ΏۂƂµ‚āA–\˜Ió‹µ‚à•]‰¿‚µ‚½B@

There was a significant increase in leukemia mortality of 0.9% (95% CI: 0.2, 1.7) per µT-year of cumulative exposure to extremely low frequency magnetic fields.
—ݐϒl‚ª1ƒÊTE”N–ˆ‚É”’ŒŒ•a‚ÌŽ€–S—¦‚Í0.9%‘‰Á‚·‚éBi•MŽÒ‚Ì’F@‚±‚̐”’l‚©‚çA100ƒÊT”N‚Å—]èƒŠƒXƒN‚Í–ñ‚P‚Æ‚È‚èAŽ€–S—¦”ä‚Í2”{‚Æ‚È‚éB1ƒKƒEƒX‚ð1”NŠÔ—‚Ñ‘±‚¯‚Ä—]èƒŠƒXƒN‚ª‚Pj@

The increase by years spent under exposure of >10 µT was even stronger: 62% per year (95% CI: 15,129).
10
ƒÊTˆÈã‚ÌŽ¥ŠE‚ɘA‘±‚µ‚Ä–\˜I‚·‚é‚ƁAŽ€–S—¦‚Í1”N–ˆ‚É62%‘‰Á‚·‚éB@

Brain cancer risk did not show a dose-response relation.
”]ŽîᇂɊւµ‚ẮA—ʁ\”½‰žŠÖŒW‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

This study contributes to the evidence for a link between heavy exposure to extremely low frequency magnetic fields and leukemia.

Its strengths include reliable measurements and reliable historical reconstruction of exposures. @
‚±‚ÌŒ¤‹†Œ‹‰Ê‚́A‹­‚¢’áŽü”gŽ¥ŠE‚Ö‚Ì–\˜I‚Æ”’ŒŒ•a‚ÌŠÖŒW‚ðŽxŽ‚·‚éB@‚±‚ÌŒ¤‹†‚͐M—Š‚Å‚«‚鑪’è‚ƁA‰ß‹Ž‚ÌŽdŽ–‚È‚Ç‚ÌŠÖŒW‚ÉŠÖ‚·‚é—š—ð‚ÉŠÖ‚µ‚Ă͐M—Š‚Å‚«‚éî•ñ‚ÉŠî‚¢‚Ä‚¢‚éB

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‚Q‚TDƒfƒ“ƒ}[ƒN“d—͏]Ž–ŽÒ‚Ì“dŽ¥ŠE–\˜I‚ƐS‘Ÿ‹@”\‚ւ̉e‹¿@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½B@@ì¬G@‚Q‚O‚O‚R|‚P|‚Q‚O@
ŒfÚŽGŽF@Am J Epidemiol 2002; 156:857-861, 2002@

˜_•¶–¼FRisk of Severe Cardiac Arrhythmia in Male Utility Workers: A Nationwide Danish Cohort Study @’j«“d—͉ïŽÐ]‹Æˆõ‚É‚¨‚¯‚éS‘Ÿ•s®–¬‚̃ŠƒXƒNAƒfƒ“ƒ}[ƒN‚Ì‘S‘‹K–͂̃Rƒz[ƒgŒ¤‹†@

Œ¤‹†ŽÒFChristoffer Johansen1, Maria Feychting2, Mogens Møller3, Per Arnsbo3, Anders Ahlbom2 and Jørgen H. Olsen1
1 Institute of Cancer Epidemiology, Danish Cancer Society, DK-2100 Copenhagen, Denmark.
2 Institute of Environmental Medicine, Karolinska Institutet, S-171 77 Stockholm, Sweden.
3 Danish Pacemaker and ICD Register, Department of Cardiology, Odense University Hospital, 5000 Odense C, Denmark.
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ŠT—vF@
To address concern about the potential cardiovascular effects of occupational exposure to electromagnetic fields in the 50- to 60-Hz frequency band, the authors launched an epidemiologic study of the incidence of severe cardiac arrhythmia, as indicated by the need for a pacemaker, in a nationwide cohort of Danish utility workers.
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‚T‚O|‚U‚O‚g‚š‚Ì“dŽ¥ŠE‚ɐE‹Æ“I‚É–\˜I‚·‚邱‚Æ‚É‚æ‚éS‘ŸŒŒŠÇ‹@”\‚ւ̉e‹¿‚ª‚ ‚é‚Ì‚Å‚Í‚È‚¢‚©‚Æ‚¢‚¤Œœ”O‚ɑ΂µ‚āAƒfƒ“ƒ}[ƒN‚Ì‘S‘‹K–Í‚Å‚Ì“d—͉ïŽÐ]Ž–ŽÒ‚ð‘ΏۂƂµ‚½ƒRƒz[ƒgW’c‚ŁAS‘Ÿ•s®–¬‚ÉŠÖ‚·‚é‰uŠw’²¸‚ð‚¨‚±‚È‚Á‚½B@

The cohort of 24,056 men employed at utility companies between 1900 and 1993 was linked to the nationwide, population-based Danish Pacemaker Register, and the numbers of persons who had undergone pacemaker implantation between 1982 and 2000 were compared with corresponding numbers in the general population.

ƒRƒz[ƒgW’c‚Í“d—͉ïŽÐ‚É‚P‚X‚W‚OH”N‚©‚ç‚P‚X‚X‚R”N‚É‚©‚¯‚ċΖ±‚µ‚Ä‚¢‚½‚Q‚S‚O‚T‚U–¼‚Å‚ ‚éB‚±‚ê‚ðƒfƒ“ƒ}[ƒN‚̐S‘Ÿƒy[ƒXƒ[ƒJ‚Ì“o˜^‚c‚a‚ð—˜—p‚µ‚āA‚P‚X‚W‚Q”N‚©‚ç‚Q‚O‚O‚O”N‚̊ԂɐS‘Ÿƒy[ƒXƒ[ƒJ‚ð‘•’…‚µ‚½l‚̐”‚𒲂ׁAˆê”ÊŒöO‚Ì•½‹Ï’l‚Æ”äŠr‚µ‚½B

In addition, the data on the utility workers were fitted to a multiplicative Poisson regression model in relation to estimated levels of exposure to 50-Hz electromagnetic fields.
‚T‚O‚g‚š@“dŽ¥ŠE‚Ö‚Ì–\˜I—Ê‚à„’肵‚½B@

Overall, based on 135 men with pacemakers (140 expected), there was no increased risk of severe cardiac arrhythmia among the utility employees; the risk estimate was 0.96 (95% confidence interval: 0.81, 1.14).
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“d—͉ïŽÐ]Ž–ŽÒ‚Ì’†‚Ńy[ƒXƒ[ƒJ‚Ì‘•’…ŽÒ”‚Í‚P‚R‚T–¼Aˆê”Ê‚Ì•½‹Ï‚©‚çŽZo‚³‚ꂽŠú‘Ò’l‚Í‚P‚S‚O–¼‚Å‚ ‚Á‚½B“dŽ¥ŠE–\˜I‚É‚æ‚éƒy[ƒXƒ[ƒJ‘•’…‚̃ŠƒXƒN‘‘å‚̓IƒbƒY”ä‚OD‚X‚U‚Å‚ ‚Á‚½B@

No clear dose-response pattern emerged with increasing levels of exposure to electromagnetic fields or with duration of employment.
@
‹Î–±”N”‚âA“dŽ¥ŠE–\˜I‹­“x‚Ƃ̗ʁ\”½‰žŠÖŒW‚Í–³‚©‚Á‚½B@

These results are largely reassuring, since they do not support the hypothesis of a link between occupational exposure to electromagnetic fields and an excess risk of severe cardiovascular arrhythmia leading to permanent implantation of a pacemaker.@
‚±‚ÌŒ‹‰Ê‚©‚çAu“dŽ¥ŠE‚Ö‚Ì–\˜I‚ªS‘Ÿ•s®–¬‚Ì‘‰Á‚©‚çƒy[ƒXƒ[ƒJ‚ð‘•’…‚µ‚È‚¯‚ê‚΂Ȃç‚È‚­‚È‚é‚Æ‚¢‚¤ƒŠƒXƒN‚ª‚ ‚év‚Æ‚¢‚¤‰¼à‚ÍŽxŽ‚Å‚«‚È‚¢B@

•Åƒgƒbƒv‚Ö–ß‚é

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‚Q‚U.@‰p‘‚Ì“d—͉ïŽÐ]‹Æˆõ‚ÌŽ¥ŠE–\˜I‚Æ”’ŒŒ•a‚̃ŠƒXƒN@

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì“üŽè@‰¼–ó‚ð‚‚¯‚½@ì¬G‚Q‚O‚O‚R|‚P|‚Q‚W@
ŒfÚŽ†FOccup Environ Med 2001; 58:307-314 (May)

˜_•¶–¼FLeukemia mortality in relation to magnetic field exposure: findings from a study of United Kingdom electricity generation and transmission workers, 1973-97

Œ¤‹†ŽÒFJ M Harrington, L Nichols, T Sorahan, M van Tongeren
Institute of Occupational Health, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
@

OBJECTIVE: To investigate whether risks of leukemia are related to occupational exposure to magnetic fields.
@
–Ú“IFŽ¥ŠE‚ւ̐E‹Æ“I‚È–\˜I‚ª”’ŒŒ•a‚̃ŠƒXƒN‚ÉŠÖ˜A‚·‚é‚©‚ÉŠÖ‚µ‚Ä’²¸‚ðs‚¤B

METHODS: The mortality experienced by a cohort of 83 997 employees of the former Central Electricity Generating Board of England and Wales was investigated for the period 1973-97.
•û–@F@ƒCƒ“ƒOƒ‰ƒ“ƒh‚ƃEƒG[ƒ‹ƒY‚Ì‚©‚‚ĂÍCEGB‚ƌĂ΂ꂽ“d—͉ïŽÐ‚̏]‹Æˆõ83997–¼‚ð‘ΏۂɁA1973”N‚©‚ç1997”N‚É‚©‚¯‚Ä’²¸‚ðs‚Á‚½B@

All employees were employed for at least 6 months with some employment in the period 1973-82.
‘ΏۂƂµ‚½]‹Æˆõ‚Í1973”N‚©‚ç1982”N‚̊ԂŁAÅ’á6ƒ–ŒŽ‚͋Ζ±‚µ‚Ä‚¢‚½l‚Å‚ ‚éB@

Computeri
‚“ed work histories were available for 79 972 study subjects for the period 1971-93.

ƒRƒ“ƒsƒ…[ƒ^‚É“ü—Í‚³‚ê‚ĉߋŽ‚̐E–±—ð‚ª–¾Šm‚ȏ]‹Æˆõ”‚Í79972–¼‚Å‚ ‚Á‚½B@

Detailed calculations were performed by others to enable a novel assessment to be made of exposures to magnetic fields. Two analytical approaches were used, indirect standardisation (n=83 997) and Poisson regression (n=79 972).
Ž¥ŠE–\˜I•]‰¿‚Í‘¼‚ÌŒ¤‹†ŽÒ‚É‚æ‚Á‚čs‚í‚ꂽB@“ñ‚‚̉ðÍ–@‚ʼnðÍ‚ðs‚Á‚½B@

RESULTS: Based on serial mortalities for England and Wales, the standardised mortality ratio of 84 for all leukemias (observed 111, expected 132.3) was similar to that of 83 for all causes (observed 14 845, expected 17 918).
Œ‹‰ÊF”’ŒŒ•a‚ÉŠÖ‚µ‚Ä‚ÍŽ€–S—¦”ä‚W‚SAŠú‘Ò’l132.3‚ɑ΂µ‚āAŠÏŽ@’l‚Í111‚Å‚ ‚Á‚½B
‚±‚ê‚Í‘S‚Ä‚ÌŽ€–SŒ´ˆö‚ł̔䗦‚Æ“¯’ö“x‚Å‚ ‚Á‚½B‘SŽ€–S‚Å‚ÍŽ€–S—¦”ä‚W‚RAŠú‘Ò’l‚P‚V‚X‚P‚W‚ɑ΂µ‚ÄŠÏŽ@’l‚Í‚P‚S‚W‚S‚T‚Å‚ ‚Á‚½B@

No significant positive trends were found for the risks of various types of leukemia (chronic lymphatic leukemia, acute myeloid leukemia, chronic myeloid leukemia, all leukemia) either with lifetime cumulative exposure to magnetic fields or with such exposures received in the most recent 5 years.
@
”’ŒŒ•a‚ÌŽí—ނʼnðÍ‚µ‚Ä‚àA‚·‚ׂĂð‘ΏۂƂµ‚Ä‚àA’¼‹ß‚Ì5”NŠÔ‚ÌŽ¥ŠE–\˜I—ʂʼnðÍ‚µ‚Ä‚àA‘S¶ŠU—ݐϖ\˜I’l‚ʼnðÍ‚µ‚Ä‚àA—LˆÓ‚ȃŠƒXƒN‚Ì‘‰Á‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

CONCLUSIONS: There are no discernible excess risks of leukemia as a consequence of occupational exposure to magnetic fields in United Kingdom electricity generation and transmission workers.
Œ‹˜_F‰p‘‚Ì“d—ÍŽ–‹Æ‚ɏ]Ž–‚·‚él‚ɐE‹Æ“I‚ÉŽ¥ŠE‚É–\˜I‚·‚邱‚Æ‚É‚æ‚é”’ŒŒ•a‚ɑ΂µ‚āAŽ¯•Ê‚Å‚«‚é‰ßè‚ȃŠƒXƒN‚Ì‘‰Á‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

•Åƒgƒbƒv‚Ö–ß‚é

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‚Q‚VD‰p‘“d—͏]Ž–ŽÒ‚ÌŽ¥ŠE‚Æ”]Žîᇂ̃ŠƒXƒN@@

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½@ì¬G‚Q‚O‚O‚R|‚Q|‚P‚U@

ŒfÚŽFOccu Environ Med 2001;58:626-630 ( October )
˜_•¶–¼FOccupational exposure to magnetic fields relative to mortality from brain tumors: updated and revised findings from a study of United Kingdom electricity generation and transmission workers, 1973-97 @
‰p‘“d—͏]‹Æˆõ‚̐E‹Æ“I‚ÈŽ¥ŠE–\˜I‚Æ”]Žîᇂł̎€–S—¦‚ÌŠÖŒWG1973|97”N‚ÌŒ¤‹†‚ÌŒ©’¼‚µ‚©‚ç@

Œ¤‹†ŽÒGT Sorahan, L Nichols, M van Tongeren, J M Harrington @
Institute of Occupational Health, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
@

OBJECTIVE
FTo investigate whether risk of brain tumor is related to occupational exposure to magnetic fields.@
–Ú“IFŽ¥ŠE‚̐E‹Æ“I‚È–\˜I‚ª”]Žî“’‚̃ŠƒXƒN‚É‚È‚Á‚Ä‚¢‚é‚©”Û‚©‚ðŠm‚©‚ß‚éB@

METHODS
FThe mortality experienced by a cohort of 83 997 employees of the former Central Electricity Generating Board of England and Wales was investigated for the period 1973-97.
•û–@FƒCƒ“ƒOƒ‰ƒ“ƒh‚ƃEƒG[ƒ‹ƒY‚Ì“d—ÍŽ–‹Æ]Ž–ŽÒ83997–¼‚ð‘ΏۂƂµA1973|1997”N‚É‚©‚¯‚Ä‚ÌŽ€–S—¦‚𒲍¸‚µ‚½B

All workers were employed for at least 6 months with some employment in the period 1973-82.
1973
|82”N‚̊ԂɍŒáŒÀ“x6ƒ–ŒŽ‹Î–±‚µ‚½‘S‚Ă̏]Ž–ŽÒ‚ð‘ΏۂƂµ‚½B@

Computerized work histories were available for 79 972 study subjects for the period 1971-93.
1971
|93”N‚̊Ԃ́A79972–¼‚̐E–±—ð‚ªAƒRƒ“ƒsƒ…[ƒ^ƒf[ƒ^‚Æ‚µ‚Ä“üŽè‚Å‚«‚½B@

Detailed calculations had been performed by others to enable a novel assessment to be made of exposures to magnetic fields.
@Ú×‚ÈŒvŽZ‚́AŽ¥ŠE–\˜I‚Ì•]‰¿‚É‚æ‚Á‚čs‚Á‚½B

Two analytical approaches were used, indirect standardization (n=83 997) and Poisson regression (n=79 972).
@2Ží—ނ̉ðÍ–@‚ðÌ—p‚µ‚½B

RESULTS
FBased on serial mortalities for England and Wales, deaths from brain cancer were close to expectation (observed 158, expected 146.4).
Œ‹‰ÊF“d—ÍŽ–‹Æ]Ž–ŽÒŠÔ‚Ì”]Žîᇂł̎€–S—¦‚́Aˆê”Ê‚ÌŠ„‡‚©‚çŒvŽZ‚µ‚½Šú‘Ò’l‚É‹ß‚¢’l‚Å‚ ‚Á‚½B@
iŠÏŽ@’l158A@Šú‘Ò’l146.4j@

No significant positive trends were shown for risks of brain tumors either with lifetime cumulative exposure to magnetic fields or with such exposures received in the most recent 5 years.
@
Ž¥ŠE‚Ö‚Ì–\˜I‚̏Ig—ݐϒl‚Å‚àA’¼‹ß‚Ì5ƒ•”N‚ÌŽ¥ŠE–\˜I‚Å‚àA—LˆÓ‚È”]Žîᇂ̃ŠƒXƒN‚Ì‘‰Á‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

CONCLUSIONS
FThere are no discernible excess risks of brain tumors as a consequence of occupational exposure to magnetic fields in United Kingdom electricity generation and transmission workers.@
Œ‹˜_F‰p‘‚Ì“d—ÍŽ–‹Æ]Ž–ŽÒ‚̐E‹Æ“I‚ÈŽ¥ŠE–\˜I‚É‚æ‚é”]Žîᇂ́A”FŽ¯‚Å‚«‚é‰ßè‚ȃŠƒXƒN‚Ì‘‰Á‚Í‚È‚¢B@

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‚Q‚X‚`DƒAƒƒŠƒJRAPIDÅI•ñ‘

 

ˆÈ‰º‚Í’©“úV•·1999”N6ŒŽ17“ú‚©‚ç‚̈ø—p‚Å‚·B
––––––––––––––––––––––––––
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•Ä‘—§ŠÂ‹«Œ’N‰ÈŠwŒ¤‹†Š‚Í15“úA“dŽ¥”g‚É‚æ‚錒N”íŠQ‚ɂ‚¢‚āA“dŽ¥”g‚ªŠà‚È‚Ç‚Ì•a‹C‚ÌŒ´ˆö‚Å‚ ‚é‰Â”\«‚Í’á‚¢‚Æ‚·‚é’²¸•ñ‘‚ð”­•\‚µ‚½B
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•ñ‘‚É‚æ‚é‚ƁA“Œv“I‚ȉuŠw’²¸‚ł́A‘—“dü‚Ì“dŽ¥”g‚𑽂­—‚ª‚é‚ÆŽq‹Ÿ‚Ì”’ŒŒ•a‚ª‚킸‚©‚É‘‚¦‚é‚È‚Ç‚ÌŒ‹‰Ê‚ªo‚Ä‚¢‚é‚à‚̂́AŽÀŒ±Žº‚Å‚Ì“®•¨‚âlŠÔ‚Å‚ÌŽÀŒ±Œ‹‰Ê‚â“dŽ¥”g‚ª—^‚¦‚é‰e‹¿‚ð×–EƒŒƒxƒ‹‚Å’²‚ׂ錤‹†‚Å‚Í‚¢‚¸‚ê‚àAˆö‰ÊŠÖŒW‚Í”F‚ß‚ç‚ê‚Ä‚¢‚È‚¢B

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‚R‚ODƒJƒiƒ_‚̐E‹Æ“I‚ÈŽ¥ŠE–\˜I‚Æ”]Žîᇁ@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½@ì¬F‚Q‚O‚O‚R|‚P|‚Q‚P@
ŒfÚŽFInternational Journal of Epidemiology 2002;31:210-217@

˜_•¶–¼FBrain cancer and occupational exposure to magnetic fields among men: results from a Canadian population-based case-control study @
’j«‚̐E‹Æ“I‚ÈŽ¥ŠE–\˜I‚Æ”]Žîᇂɂ‚¢‚ẴJƒiƒ_‚̏Ǘá‘Ώƌ¤‹†@

Œ¤‹†ŽÒFPaul J Villeneuvea, David A Agnewc, Kenneth C Johnsona and Yang Maoa and the Canadian Cancer Registries Epidemiology Research Group@

Abstract
@ŠT—v@
Background: The relationship between occupational exposure to magnetic fields and brain cancer in men was investigated using population-based case-control data collected in eight Canadian provinces. Emphasis was placed on examining the variations in risk across different histological(
‘gDŠw“I) types. @

”wŒiF’j«‚ªE‹Æ“I‚ÉŽ¥ŠE‚É–\˜I‚·‚邱‚Æ‚Æ”]ŽîᇂƂ̊֌W‚ðAƒJƒiƒ_‚Ì‚WB‚ŏǗá‘Ώƌ¤‹†‚ð‚¨‚±‚È‚Á‚½B“Á‚ɁA‘gDŠw“I‚ȉðÍ‚ð‚¨‚±‚È‚Á‚½B@

Methods: A list of occupations was compiled for 543 cases and 543 controls that were individually matched by age.

•û–@F‚T‚S‚R‚̏Ǘá‚Æ”N—î‚ðƒ}ƒbƒ`‚³‚¹‚½‚T‚S‚R‚̑ΏƌS‚̐E‹Æ‚ðƒŠƒXƒg‚µ‚½B@

Occupations were categorized according to their average magnetic field exposure through blinded expert review (<0.3, 0.3-<0.6, and  0.6 ƒÊT). @

ŠeE‹Æ‚Í–ÓŒŸ“I‚ɐê–å‰Æ‚̃`ƒFƒbƒN‚É‚æ‚Á‚āA•½‹ÏŽ¥ŠE–\˜I—ʁi0.3ˆÈ‰ºA0.3|0.6A0.6ƒÊTˆÈãj‚É•ª—Þ‚³‚ꂽB@

In total, 133 cases (14%) and 123 controls (12%) were estimated to have at least one occupation whereby magnetic field exposures exceeded 0.3 ƒÊT. Odds ratios (OR) were generated using conditional logistic regression, and were adjusted for suspected occupational risk factors for brain cancer. @

‡Œv133‚̏Ǘᐔi14“j‚Æ123‚̑ΏƌSi12“j‚́A0.3ƒÊTˆÈã‚ÌŽ¥ŠE–\˜I‚ðŽó‚¯‚Ä‚¢‚éE‹Æ‚́A­‚È‚­‚Æ‚à‚ЂƂ‚̐E‹Æ‚ɏŠ‘®‚µ‚Ä‚¢‚½B@‚»‚µ‚Ä”]Žîᇂ̃ŠƒXƒN‚ðƒIƒbƒY”ä‚ÅŒvŽZ‚µ‚½B

Results: A non-significantly increased risk of brain cancer was observed among men who had ever held a job with an average magnetic field exposure >0.6 ƒÊT relative to those with exposures <0.3 ƒÊT (OR = 1.33, 95% CI: 0.75-2.36). @

Œ‹‰ÊF0.3ƒÊTˆÈ‰º‚Ì–\˜I‚ɑ΂µ‚āA0.6ƒÊTˆÈã‚ÌŽ¥ŠE–\˜I‚É‚æ‚é”]Žîᇂ̃ŠƒXƒN‚̃IƒbƒY”ä‚Í1.33iCI: 0.75-2.36j‚ŁA—LˆÓ‚È‘‰Á‚Í‚È‚©‚Á‚½B@

A more pronounced risk was observed among men diagnosed with glioblastoma multiforme (
‘½Œ`‚̐_ŒoäPŽ¿•ê×–EŽî)(OR = 5.36, 95% CI: 1.16-24.78).

–¾Šm‚ȃŠƒXƒN‚Í‘½Œ`‚̐_ŒoäPŽ¿•ê×–EŽî‚É‚ ‚èAƒIƒbƒY”ä‚Í5.36iCI:1.16|24.78j‚Å‚ ‚Á‚½B@

Moreover, a cumulative time weighted index score of magnetic field exposure was significantly related to glioblastoma multiforme (P = 0.02). @

‚»‚µ‚Ä‘½Œ`‚̐_ŒoäPŽ¿•ê×–EŽî‚ÉŠÖ‚µ‚Ă͗ݐς̎¥ŠE–\˜I‚Ì‹­‚³‚ÆŠÖ˜A«‚ª‚ ‚Á‚½B

In contrast, magnetic field exposures were not associated with astrocytoma i¯ó×–EŽîjor other brain cancers. @

ˆê•ûA¯ó×–EŽî‚Æ‚»‚Ì‘¼‚Ì”]ŽîᇂɊւµ‚Ä‚ÍŽ¥ŠE–\˜I‚Æ‚ÌŠÖ˜A‚Í–³‚©‚Á‚½B@

Conclusions Our findings support the hypothesis that occupational magnetic field exposure increases the risk of glioblastoma multiforme. @

Œ‹˜_F¡‰ñ‚ÌŒ‹‰Ê‚́A‘½Œ`‚̐_ŒoäPŽ¿•ê×–EŽî‚ÉŠÖ‚µ‚ẮAE‹Æ“I‚ÈŽ¥ŠE–\˜I‚É‚æ‚Á‚ăŠƒXƒN‚ª‘‰Á‚·‚é‚Æ‚¢‚¤‰¼à‚ðŽxŽ‚·‚éB@

ˆÈã@@‹»–¡‚Ì‚ ‚é•û‚́AŒ´’˜i‘S•¶j‚ð“üŽè‚µ‚Ä“Ç‚ñ‚Å‚­‚¾‚³‚¢B

 

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‚R‚PDƒfƒ“ƒ}[ƒN‚Ì“d—͉ïŽÐ]‹Æˆõ‚ÌŽ¥ŠE–\˜I‚Æ‘½”­«d‰»Ç‚̃ŠƒXƒN

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽèB@‰¼–ó‚ð‚‚¯‚½@ì¬F‚Q‚O‚O‚R|‚P|‚Q‚X@
ŒfÚŽFNeurology 1999;52:1279@

˜_•¶–¼FMultiple sclerosisi‘½”­«d‰»Çjamong utility workers @
“d—ÍŽ–‹Æ]Ž–ŽÒŠÔ‚Ì‘½”­«d‰»Ç‚̃ŠƒXƒN@

Œ¤‹†ŽÒFChristoffer Johansen, MD, Nils Koch-Henriksen, MD, Søren Rasmussen, MSc and Jøorgen H. Olsen, MD

ŠT—vF@
The incidence of MS was assessed in a nationwide cohort study of 31,990 employees of Danish utility companies between 1900 and 1993.
@
1900
”Ni?j‚©‚ç1993 ”N‚̊Ԃ́Aƒfƒ“ƒ}[ƒN‚Ì“d—ÍŽ–‹Æ]Ž–ŽÒ31,990 –¼‚ð‘ΏۂƂµ‚½ƒRƒz[ƒgŒ¤‹†‚ŁA‘½”­«d‰»Ç‚Ì”­¶—¦‚𒲍¸‚µ‚½B@

Overall, 32 cases of MS were diagnosed, as compared with 23.7 expected from national incidence rates, to yield a standardized incidence ratio of 1.35 (95% confidence interval, 0.92 to 1.91).
Šú‘Ò’l23.7Œ‚ɑ΂µ‚āAŠÏŽ@’l‚Í32Œ‚Å‚ ‚èA•W€‰»”­¶—¦‚Í1.35iCIF0.92-1.91j‚Å‚ ‚Á‚½B

We found no support for the hypothesis of an association between occupational exposure to electromagnetic fields and the risk of MS.
@
‚±‚Ì‚±‚Ƃ́AE‹Æ“I‚È“dŽ¥ŠE‚Ö‚Ì–\˜I‚Æ‘½”­«d‰»Ç‚̃ŠƒXƒN‚ÉŠÖ‚·‚鉼à‚ðŽxŽ‚µ‚È‚¢B@

––––––––––––@@@–––––––––––––––

‹»–¡‚Ì‚ ‚é•û‚ÍŒ´’˜i‘S•¶j‚ð“üŽè‚µ‚Ä“Ç‚ñ‚Å‚­‚¾‚³‚¢B

 

‘½”­«d‰»ÇF

Çó‚ðŒ»‚·Œ´ˆö‚Æ‚È‚é•a‘ƒied‰»f‚‚܂èA•a‘ƒ‚̐_Œo‘gD‚ªG‚Á‚Ä‚Ý‚é‚ƍd‚­‚È‚Á‚Ä‚¢‚éj@‚ª‘å”]‚âÒ‘A‚Ü‚ê‚É––½_Œo‚Æ‚¢‚í‚ê‚élŠÔ‚̐_Œo‘gD‚ɁAˆê‚ˆȏãŠô‚‚àA‚ ‚¿‚±‚¿‚ÉŽUÝ‚µ‚ďo—ˆ‚Ä‚«‚Ü‚·B‚©‚È‚è‹}‚É•à‚­‚Æ‚Ó‚ç‚‚­A–Ú‚ª‚©‚·‚ށA“ñd‚ÉŒ©‚¦‚éA”A‚ªo‚É‚­‚¢A‚Ȃǂ̏Ǐó‚Å”­•a‚µ‚Ü‚·B‚Æ‚­‚ɏ—«‚Í’j«‚É‚­‚ç‚ׁA‚±‚Ì•a‹C‚É‚©‚©‚Á‚Ä‚¢‚él‚ª‚â‚⑽‚­A“ú–{‚Å‚Í‚l‚rŠ³ŽÒ‚͐lŒû10–œl“–‚½‚è3.7‚©‚瑽‚­‚Ä‚à5.0l‚®‚ç‚¢‚Å‚ ‚é‚ƍl‚¦‚ç‚ê‚Ü‚·‚ªA‰¢•Äl‚ÌŠÔ‚Å‚Í‚à‚Á‚Æ‘½‚¢•a‹C‚ŁA‚±‚̐”Žš‚Í30.0‚©‚ç90.0‚®‚ç‚¢‚É‚È‚è‚Ü‚·B

 

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‚R‚QD×–E‚É100ƒÊTŽ¥ŠE–\˜I‚µ‚Ä‚à‰e‹¿‚È‚µ@@


ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½B@ì¬F@‚Q‚O‚O‚R|‚P|‚R‚O@@

ŒfÚŽ†FCarcinogenesis, Vol. 21, No. 6, 1221-1226, June 2000@
˜_•¶–¼FEffects of 60 Hz extremely low frequency magnetic fields (EMF) on radiation- and chemical-induced mutagenesisi“Ë‘R•ÏˆÙj in mammalianišM“û—ށj cells @
šM“û—ލזE‚ð—p‚¢‚½•úŽËüE”­‚ª‚ñ«‰»Šw•¨Ž¿‚Å—U“±‚µ‚½60HzŽ¥ŠE–\˜I‚ÌŒø‰Ê@

Œ¤‹†ŽÒFRaheel M. Ansari and Tom K. Hei1 @
Center for Radiological Research, College of Physicians and Surgeons of Columbia University, VC 11-218, 630 West 168th Street, New York, NY 10032, USA @

ŠT—vF@
There is considerable uncertainty of the potential biological effects of extremely low frequency magnetic fields (ELF-MF or EMF) because of mixed results in epidemiological and laboratory studies.
‰uŠw‚âŽÀŒ±Žº‚Å‚ÌŽÀŠ´‚Å‚ÍŒ‹‰Ê‚̈ê’v‚ðŒ©‚Ä‚¢‚È‚¢‚±‚Æ‚©‚çA•sŠm’è‚ÅŠm”F‚·‚ׂ«‰Û‘è‚Æ‚µ‚āAEMFŽ¥ŠE‚̐¶‘̂ւ̉e‹¿‚ª‚ ‚éB@

In the present study, exponentially growing human–hamster hybrid AL cells were treated with a 100 µT alternating EMF powered at 60 Hz for either 24 h or 7 days.
@
‚±‚ÌŒ¤‹†‚ł́A60Hz‚Å100ƒÊTi1ƒKƒEƒXj ‚ÌŽ¥ŠE‚ð24ŽžŠÔ‚à‚µ‚­‚Í7“úŠÔAƒqƒg‚ƃnƒ€ƒXƒ^[‚ðŠ|‚¯‡‚킹‚½×–E‚Ɉó‰Á‚µ‚½B

Exposure to EMF was conducted either alone or in combination with graded doses of a physical or chemical carcinogen.
@
Ž¥ŠE‚¾‚¯‚É–\˜I‚µ‚½ŽÀŒ±‚ƁA•¨—“I‚à‚µ‚­‚͉»Šw“I‚È”­‚ª‚ñ«•¨Ž¿‚Æ‚Ì‘g‚ݍ‡‚킹‚Å‚àŽÀŒ±‚ðs‚Á‚½B@

ƒÁ-radiation was chosen as a form of ionizing radiation while N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) was chosen as a form of chemical contaminanti‰˜õj. @
ƒKƒ“ƒ}[ü‚𕨗“I‚È“d—£•úŽËüŒ¹‚Æ‚µ‚āAMNNG‚ð‰»Šw“I‚È”­ƒKƒ“•¨Ž¿‚Æ‚µ‚Ä‘I‘ð‚µ‚½B@

Exposure of AL cells to EMF alone for a period up to 7 days was non-cytotoxic
i×–E“Ő«‚́jand non-mutagenic.@
Ž¥ŠE‚¾‚¯‚Ì–\˜I‚ł́A24ŽžŠÔ‚Å‚à7“úŠÔ‚Ì–\˜I‚Å‚àA×–E“Ő«‚â“Ë‘R•ÏˆÙ‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

Concurrent EMF treatment did not increase either the cytotoxicity or induction of CD59– mutants by graded doses of
ƒÁ-rays or MNNG in AL cells.@
ƒKƒ“ƒ}[üAMNNG‚É‚æ‚é”­ƒKƒ“‚́AŽ¥ŠE–\˜I‚É‚æ‚Á‚Ä‘‰Á‚µ‚È‚©‚Á‚½B@

This study shows conclusively that short-term or long-term exposure to EMF alone neither affects the survival of AL cells nor increases the mutagenic potency
iŒø—́jof other environmental carcinogens. @
‚±‚ÌŒ¤‹†‚ŁA’ZŠú‚Æ’·Šú‚Å‚ÌŽ¥ŠE–\˜I‚́AŽ¥ŠE‚¾‚¯‚Ì–\˜I‚Å‚àA‚Ü‚½‘¼‚Ì”­Šà•¨Ž¿‚ÌŒø—͂𑝉Á‚³‚¹‚½‚èA×–E‚̐¶‘¶—¦‚ɉe‹¿‚µ‚½‚è‚·‚邱‚Æ‚Í‚È‚¢‚Æ‚¢‚¦‚éB@

•Åƒgƒbƒv‚Ö–ß‚é

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‚R‚RD“d—͉ïŽÐ‚Å‚ÌŽ¥ŠE–\˜I‚Í–â‘肪‚È‚­A“dŠE–\˜I‚ª–â‘è‚Æ‚·‚錤‹†¬‰Ê@@

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽèB@‰¼–ó‚ð‚‚¯‚½B@ì¬F@‚Q‚O‚O‚R|‚P|‚R‚P@
@ƒgƒƒ“ƒg‘åŠw‚ÌMiller‚͈ê˜A‚ÌŒ¤‹†‚Å“dŠE‚Ƃ̈ö‰ÊŠÖŒW‚ð•ñ‚µ‚Ä‚¢‚éB@

ŒfÚŽFOccup Environ Med 2000;@57:249-257 ( April )
˜_•¶–¼FNon-Hodgkin's lymphoma among electric utility workers in Ontario: the evaluation of alternate indices of exposure to 60 Hz electric and magnetic fields @
ƒIƒ“ƒ^ƒŠƒI‚Ì“d—͉ïŽÐ]‹Æˆõ‚Ì”ñƒzƒWƒLƒ“”’ŒŒ•aF‚U‚OHz “dŽ¥ŠE–\˜IŽw•W‚Ì•]‰¿@

Œ¤‹†ŽÒFPaul J Villeneuvea b, David A Agnewa c, Anthony B Millera, Paul N Coreya @
oa Department of Public Health Sciences, University of Toronto, Toronto, Ontario, Canada, b Department of Epidemiology and Community Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada, c Ontario Power Generation, Toronto, Ontario, Canada@

OBJECTIVES
G To examine associations between non-Hodgkin's lymphoma (NHL) and exposures to 60 Hz magnetic and electric fields in electric@utility workers with a series of indices that capture a variety of aspects of field strength.@
–Ú“IF“d—͉ïŽÐ]‹Æˆõ‚Ì‚U‚OHz“dŽ¥ŠE–\˜I‚Æ”ñƒzƒWƒLƒ“”’ŒŒ•a‚ÌŠÖŒW‚ðA‚¢‚ë‚¢‚ë‚È–\˜I•]‰¿Žw”‚ð—p‚¢‚ÄŒŸ“¢‚·‚éB@

METHODS
F The study population consisted of 51 cases of NHL and 203 individually matched controls identified from within a cohort of male electric utility workers in Ontario.

Odds ratios were calculated for several exposure indices with conditional logistic regression models. @
•û–@F51–¼‚Ì”ñƒzƒWƒLƒ“”’ŒŒ•a‚̏Ǘá‚ƁA203–¼‚̑ΏƌQ‚ð‘ΏۂƂµ‚½B@‚¢‚ë‚¢‚ë‚È–\˜IŽw”‚ð—p‚¢‚ăIƒbƒY”ä‚ðŒŸ“¢‚µ‚½B

Aspects of exposure to electric and magnetic fields that were modeled included: the percentage of time spent above selected threshold field intensities, mean transitions in field strength, SD, and the arithmetic and geometric mean field intensities.
@
“Á’è‚Ì“dŽ¥ŠE‹­“x‚ð臒l‚Æ‚µ‚Đݒ肵‚Ä‚»‚êˆÈã‚Ì‹­“x‚É–\˜I‚·‚鎞ŠÔ‚ÌŠ„‡AŽZp“I•½‹Ï’lAŠô‰½Šw“I‚È•½‹Ï’l‚È‚Ç‚ð–\˜IŽw”‚Æ‚µ‚½B@

RESULTS
F For the most part, there was a lack of an association between exposure indices of magnetic fields and the incidence of NHL. @
Subjects in the upper tertile of percentage of time spent above electric field intensities of 10 and 40 V/m had odds ratios of 3.05 (95% confidence interval (95% CI) 1.07 to 8.80) and 3.57 (1.30 to 9.80), respectively, when compared with those in the lowest tertile.

‰ðÍ‚̑命”‚ł́A”ñƒzƒWƒLƒ“”’ŒŒ•a‚ÆŽ¥ŠE–\˜I‚Æ‚ÌŠÖŒW‚Í‚È‚©‚Á‚½B@
‚µ‚©‚µA‚P‚OV/m‚Æ‚S‚OV/m‚ð’´‚¦‚é“dŠE‹­“x‚É–\˜I‚·‚鎞ŠÔ‚ÌŠ„‡‚ª‚‚©‚Á‚½l‚̃IƒbƒY”ñ‚ÍŠ„‡‚Ì’á‚©‚Á‚½l‚É”ä‚ׂ½ŽžA‚»‚ꂼ‚ê‚RD‚O‚TiCI:‚PD‚R‚O|‚XD‚W‚OjA‚RD‚T‚ViCI:‚PD‚O‚V|‚WD‚W‚Oj‚Å‚ ‚Á‚½B@

Moreover, the percentages of time spent above these electric field thresholds were significant predictors of case status over and above the association explained by duration of employment and the arithmetic or geometric mean exposure.
@
ã‹L‚Ì“dŠE‹­“x‚Ì臒l‚ð‰z‚¦‚é–\˜I‚ðŽó‚¯‚Ä‚¢‚鎞ŠÔ‚ÌŠ„‡‚́AÇ—á‚Ì–\˜Ió‹µ‚ðŽ¦‚·Žw•W‚Æ‚È‚èA‹Î–±”N”‚â–\˜I‹­“x‚ÌŽZp•½‹ÏEŠô‰½Šw“I•½‹Ï’l‚Æ–§Ú‚ÉŠÖŒW‚µ‚Ä‚¢‚éB@

CONCLUSIONS
F These data suggest that exposures above electric field threshold intensities of 10 and 40 V/m are important predictors of NHL. @
Consequently, the findings support the hypothesis that electric fields may play a promoting part in the aetiology
i•aˆöŠwj of this cancer. @
Œ‹˜_F–\˜I‚·‚é“dŠE‹­“x‚P‚OV/m‚â‚S‚OV/m‚͏d—v‚È—\‘ªŽw”‚Æ‚È‚éB‚±‚ÌŒ¤‹†¬‰Ê‚Í‚ª‚ñ‚Ì•aˆöŠw‚É‚¨‚¢‚āA“dŠE‚ªƒvƒƒ‚[ƒ^ì—p‚ðŽ‚Â‚Æ‚¢‚¤‰¼à‚ðŽxŽ‚·‚éB@

Further occupational studies that include assessment of exposure to electric fields and measures of field strength above similar threshold cut off points are needed to confirm these findings.
@
¡Œã‚̐E‹Æ–\˜I‚ÉŠÖ‚·‚錤‹†‚ł́A¡‰ñŽ¦‚µ‚½‚悤‚È臒l‚ð—p‚¢‚āA“dŽ¥ŠE‹­“x‚Ì–\˜I•]‰¿‚às‚¢A‚±‚ÌŒ¤‹†¬‰Ê‚ðŠm‚©‚ß‚é•K—v‚ª‚ ‚éB@

 

•Åƒgƒbƒv‚Ö–ß‚é

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‚R‚SD@ƒAƒƒŠƒJ‚̃Šƒlƒbƒg‚̏¬Ž™‚ªƒ“‚ÆŽ¥ŠE‚̉uŠwŒ¤‹†@


˜_•¶–¼FResidential Exposure to Magnetic Fields and Acute Lymphoblastic Leukemia in Children@Žq‹Ÿ‚Ì‹}«”’ŒŒ•a‚ƏZŠÂ‹«‚É‚¨‚¯‚鎥ŠE–\˜I@
Œ¤‹†ŽÒFMartha S. Linet, M.D., Elizabeth E. Hatch, Ph.D., Ruth A. Kleinerman, M.P.H., et al:
ŒfÚŽGŽFThe New England Journal of Medicine@Volume 337:1-8. Number 1. July 3, 1997

ABSTRACT ŠT—v
Background
F”wŒi
Previous studies found associations between childhood leukemia and surrogate indicators of exposure to magnetic fields (the power-line classification scheme known as "wire coding"),
@but not between childhood leukemia and measurements of 60-Hz residential magnetic fields.
Ž¥ŠE–\˜I‚Ì‘ã—pŽw”‚Æ‚µ‚ẴƒCƒ„ƒR[ƒh‚Å‚ÍŽ¥ŠE–\˜I‚É‚æ‚鏬Ž™”’ŒŒ•a‚̃ŠƒXƒN‘‰Á‚ª•ñ‚³‚ê‚Ä‚¢‚邪AŽÀ‘ª‚µ‚½Ž¥ŠE–\˜I’l‚Æ‚ÌŠÖŒW‚ÍŒ©‚‚©‚Á‚Ä‚¢‚È‚¢B

Methods
F•û–@@
We enrolled 638 children with acute lymphoblastic leukemia (ALL) who were under 15 years of age and were registered with the Children's Cancer Group and 620 controls in a study of residential exposure to magnetic fields generated by nearby power lines.
ZŠÂ‹«‰º‚ŁA‘—“dü‚É‚æ‚Á‚Ä”­¶‚µ‚Ä‚¢‚鎥ŠE–\˜I‚ÌŒ¤‹†‚Ì‚½‚߂ɁAƒKƒ““o˜^‚©‚ç15ÎˆÈ‰º‚Å‹}«”’ŒŒ•a‚É‚È‚Á‚½‚U‚R‚W‚̏Ǘá‚Æ‚U‚Q‚O‚̑ΏƂð‘I‘ð‚µ‚½B

In the subjects' current and former homes, data collectors blinded to the subjects' health status measured magnetic fields for 24 hours in each child's bedroom and for 30 seconds in three or four other rooms and outside the front door.
Ž¥ŠE‚Ì‹­‚³‚𑪒肷‚é‹ZpŽÒ‚́A‘ª’è‘ΏۂƂȂé‰Æ’낪AÇ—á‚©‘ΏƂ©AŒ»ÝZ‚ñ‚Å‚¢‚é‰Æ‚©A‰ß‹Ž‚ɏZ‚ñ‚Å‚¢‚½‰Æ‚©‚Í‚í‚©‚ç‚È‚¢‚悤‚ɁA–ÓŒŸ–@‚ōs‚Á‚½BŽ¥ŠE‚Ì‘ª’è‚Í24ŽžŠÔŽq‹Ÿ‚̐QŽº‚ŁA‚»‚µ‚Ä30•bŠÔ‚Ì‚R|‚S‚Ì‘¼‚Ì•”‰®‚ÆŒºŠÖ‚ÌŠO‘¤‚Å‚¨‚±‚È‚Á‚½B

A computer algorithm assigned wire-code categories, based on the distance and configuration of nearby power lines, to the subjects' main residences (for 416 case patients and 416 controls) and to those where the family had lived during the mother's pregnancy with the subject (for 230 case patients and 230 controls).
Še416‚̏Ǘá‚ƑΏƂɑ΂µ‚āA‚Ì‘—“dü‚̍\¬‚â‘—“dü‚ƉƂ̋——£‚È‚Ç‚©‚烏ƒCƒ„ƒR[ƒh‚̃Rƒ“ƒsƒ…[ƒ^”»’è‚ōs‚Á‚½B‚Ü‚½Še230‚̏Ǘá‚ƑΏƂɑ΂µ‚ẮA•êe‚ª”DP’†‚ɏZ‚ñ‚Å‚¢‚½‰Æ‚ð‘Ώۂɂµ‚āAŒ¤‹†‚ðs‚Á‚½B@

Results
Œ‹‰ÊF@
The risk of childhood ALL was not linked to summary time-weighted average residential magnetic-field levels, categorized according to a priori criteria.
“–‰‚ÌŒ¤‹†‰Û‘èÝ’è‚É‚Ì‚Á‚Æ‚ès‚Á‚½ZŠÂ‹«‚É‚¨‚¯‚鎞ŠÔ‚ɏd‚Ý•t‚¯‚ð‚µ‚½•½‹ÏŽ¥ŠE’l‚Æ”­ƒKƒ“‚ÌŠÖŒW‚ÍŒ©o‚¹‚È‚©‚Á‚½B

The odds ratio for ALL was 1.24 (95 percent confidence interval, 0.86 to 1.79) at exposures of 0.200 µT or greater as compared with less than 0.065 µT.

0.065ƒÊTˆÈ‰º‚Æ”äŠr‚µ‚Ä0.2ƒÊTˆÈã‚ÌŽ¥ŠE–\˜IŒQ‚ł́A‹}«¬Ž™”’ŒŒ•a‘‰Á‚̃IƒbƒY”ä‚Í‚PD‚Q‚Si‚X‚T“M—Š‹æŠÔF‚OD‚W‚U|‚PD‚V‚Xj‚Å‚ ‚Á‚½B@

The risk of ALL was not increased among children whose main residences were in the highest wire-code category (odds ratio as compared with the lowest category, 0.88; 95 percent confidence interval, 0.48 to 1.63).
ƒƒCƒ„ƒR[ƒh@‚ł̉ðÍ‚Å‚àA‚–\˜IŒQ‚ł̃IƒbƒY”ä‚Í‚OD‚W‚Wi‚X‚T“M—Š‹æŠÔF‚OD‚S‚W|‚PD‚U‚Rj‚Å‚ ‚èA¬Ž™‹}«”’ŒŒ•a‚̃ŠƒXƒN‚Ì‘‰Á‚Í‚È‚©‚Á‚½B@

Furthermore, the risk was not significantly associated with either residential magnetic-field levels or the wire codes of the homes mothers resided in when pregnant with the subjects.
‚³‚ç‚ɁA•êe‚ª”DP’†‚ɏZ‚ñ‚Å‚¢‚½ZŠÂ‹«‚É‚¨‚¯‚éŽÀ‘ª‚ÌŽ¥ŠE‹­“x‚ƁAƒƒCƒ„ƒR[ƒh‚Æ‚à—LˆÓ‚ÈŠÖ˜A«‚Í‚È‚©‚Á‚½B@

Conclusions
@Œ‹˜_F@
Our results provide little evidence that living in homes characterized by high measured time-weighted average magnetic-field levels or by the highest wire-code category increases the risk of ALL in children. @
‚±‚ÌŒ¤‹†‚©‚çAZŠÂ‹«‚É‚¨‚¯‚鎞ŠÔ‚ŏd‚Ý•t‚¯‚ð‚µ‚½•½‹Ï’l‚ð—p‚¢‚½Ž¥ŠE–\˜I‚ƃƒCƒ„ƒR[ƒh‚Å‚Ì”»’è‚ł́AŽq‹Ÿ‚Ì‹}«”’ŒŒ•a‚̃ŠƒXƒN‚Ì‘‰Á‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B@

ƒRƒƒ“ƒgF@
‚±‚ÌŒ¤‹†ŽÒ‚ÌŒ‹˜_‚Ƃ͕ʂɁA‚±‚ÌŒ¤‹†ƒf[ƒ^‚ɂ́A0.4ƒÊTˆÈã‚̍‚‚¢Ž¥ŠE–\˜I‚ł́A”’ŒŒ•a‚̃ŠƒXƒN‘‰Á‚ª‚Ý‚ç‚ê‚邱‚Æ‚©‚çA‘¼‚̉uŠwŒ¤‹†ŽÒ‚́A‚±‚ÌŒ¤‹†‚ÍŽ¥ŠE‚ª¬Ž™”’ŒŒ•a‚̃ŠƒXƒN‚𑝉Á‚³‚¹‚邱‚Æ‚ðŒŸØ‚µ‚½Œ¤‹†•ñ‚Å‚ ‚é‚ƁA—‰ð‚³‚ê‚邱‚Æ‚ª‚ ‚éB@

ƒf[ƒ^‚̈ꕔ‚ðˆø—pF@ ŽÀ‘ª‚µ‚½Ž¥ŠE‹­“x‚Æ”’ŒŒ•a‚̃ŠƒXƒN

Ž¥ŠE‹­“x@ƒÊT

Ç—ᐔ

‘ΏƐ”

ƒIƒbƒY”ä

0.065ˆÈ‰º

267

285

1.00

0.065-0.099

123

117

1.10(0.81-1.50)

0.10-0.199

151

143

1.10(0.83-1.48)

0.20ˆÈã‡ŽZ

83

70

1.24(0.86-1.79)

“à–ó0.20-0.299

38

42

0.92(0.57-1.48)

0.30-0.399

22

17

1.39(0.72-2.72)

0.40-0.499

14

5

3.28(1.15-9.39)

0.50ˆÈã

9

6

1.41(0.49-4.09)

@‚±‚Ì•\‚©‚ç‚í‚©‚é‚悤‚ɁA‚Qm‚fˆÈã‚Å‚Ü‚Æ‚ß‚é‚ƃŠƒXƒN‚Ì‘‰Á‚Í‚È‚¢B
‚µ‚©‚µA‚S‚‚fˆÈã‚Æ‚¢‚¤×‚©‚¢”Žš‚ðŒ©‚ê‚΁AƒŠƒXƒN‚Ì‘‰Á‚ª‚ ‚é‚ÆŒ©‚邱‚Æ‚ª‚Å‚«‚éƒf[ƒ^‚ª•ïŠÜ‚³‚ê‚Ä‚¢‚éB

ƒf[ƒ^‚ðˆø—p@ƒ[ƒgƒnƒCƒ}[‚̃ƒCƒ„ƒR[ƒh‚ł̉ðÍŒ‹‰Ê

ƒƒCƒ„ƒR[ƒh

Ç—ᐔ

‘ΏƐ”

ƒIƒbƒY”ä

UG{VLCC

175

175

1.00

OLCC

116

114

1.07(0.74-1.54)

OHCC

87

87

0.99(0.67-1.48)

VHCC

24

26

0.88(0.48-1.63)

@‚±‚Ì•\‚©‚ç‚í‚©‚é‚悤‚ɁAƒƒCƒ„ƒR[ƒh‚ł̉ðÍ‚ł́AƒŠƒXƒN‚Ì‘‰Á‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

 

ˆÈã@‹»–¡‚Ì‚ ‚é•û‚́AŒ´’˜‘S•¶‚ð“Ç‚ñ‚Å‚­‚¾‚³‚¢B

•Åƒgƒbƒv‚Ö–ß‚é

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‚R‚TDƒƒ‰ƒgƒjƒ“‰¼à‚ÌŒ¤‹†@

ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½B@ì¬G@‚Q‚O‚O‚R|‚R|‚Q‚O@

ŒfÚŽFEnvironmental Health Perspectives Volume 109, Number 5, May 2001
@
˜_•¶–¼FExamination of the Melatonin Hypothesis in Women Exposed at Night to EMF or Bright Light @
@@@@@–éŠÔ‚Ì“dŽ¥ŠEE–¾‚é‚¢Œõ‚Ö‚Ì–\˜I‚É‚æ‚鏗«‚̃ƒ‰ƒgƒjƒ“‰¼à‚ÌŒŸØA
Œ¤‹†ŽÒGCharles Graham, Mary R. Cook, Mary M. Gerkovich, and Antonio Sastre

@@@@@Midwest Research Institute, Kansas City, Missouri, USA

 

Abstract@ŠT—v
It has been hypothesized that the increased incidence of breast cancer in industrial societies is related to greater exposure to power-frequency electric and magnetic fields (EMF) and/or the presence of high levels of light at night (LAN).
æiH‹ÆŽÐ‰ï‚É‚¨‚¯‚é“û‚ª‚ñ‚Ì‘‰Á‚́A“d—ÍŽü”g”‚Ì“dŽ¥ŠE‚Ö‚Ì–\˜I‚à‚µ‚­‚Í–éŠÔ‚É–¾‚é‚¢Œõ‚𗁂тĂ¢‚邽‚ß‚Å‚ ‚é‚Æ‚¢‚¤‰¼à‚ª‚ ‚éB

EMF and LAN are said to reduce circulating levels of the hormone melatonin which, in turn, allows estrogen levels to rise and stimulate the turnover of breast epithelial stem cells and increase the risk for malignant transformation.
“dŽ¥ŠEE–éŠÔ‚ÌŒõ‚̓ƒ‰ƒgƒjƒ“‚ðŒ¸­‚³‚¹A‚»‚µ‚āAˆ««‚Ì‘gD•Ï«‚𑝉Á‚³‚¹‚é‚Æ‚¢‚í‚ê‚Ä‚¢‚éB

Three laboratory-based studies, in which a total of 53 healthy young women were exposed at night to EMF or to LAN under controlled exposure conditions, were performed to determine whether such exposures reduce melatonin and are associated with further alterations in estrogen.
@
‡Œv53–¼‚ÌŒ’N‚ÈŽá‚¢—«‚ð‘ΏۂɁA–éŠÔ‚Ì“dŽ¥ŠE–\˜I‚ÆŒõ‚Ì–\˜I‚É‚æ‚Á‚āAƒƒ‰ƒgƒjƒ“‚ªŒ¸­‚µAƒGƒXƒgƒƒQƒ“‚ɉe‹¿‚ª‚ ‚é‚©’²¸‚µ‚½B

All-night exposure to industrial-strength magnetic fields (60 Hz, 28.3 µT) had no effect on the blood levels of melatonin or estradiol.
@
–éŠÔ‚ÌŽ¥ŠE–\˜Ii‚U‚O‚g‚š@28.3ƒÊ‚sj‚́@ŒŒ’†‚̃ƒ‰ƒgƒjƒ“AƒGƒXƒgƒ‰ƒfƒBƒI[ƒ‹‚̗ʂɕω»‚Í‚È‚©‚Á‚½B@

In contrast, nocturnal melatonin levels were profoundly suppressed, and the time of peak concentration was significantly delayed in women exposed to LAN, regardless of whether they were in the follicular or luteal phase of the menstrual cycle.
‘ΏۓI‚ɁA–¾‚é‚¢Œõ‚𗁂т½ê‡‚Í–éŠÔ‚̃ƒ‰ƒgƒjƒ“‚Ì—Ê‚Í—}§‚³‚êAƒs[ƒN‚ƂȂ鎞ŠÔ‚à‘å‚«‚­’x‚ꂽB@@

These changes, however, were not associated with alterations in point-for-point matching measures of estradiol.
@

Women who chronically secrete high or low amounts of melatonin each night (area-under-curve range: 86-1,296 pg/mL) also did not differ in their blood levels of estradiol.
@
–«“I‚Ƀƒ‰ƒgƒjƒ“•ª”å‚Ì—Ê‚ª‘½‚¢l‚Ə­‚È‚¢l‚ÅŒŸ“¢‚µ‚½‚ªAŒŒ’†‚̃GƒXƒgƒ‰ƒfƒBƒI[ƒ‹‚̗ʂɂ͍·ˆÙ‚ª‚È‚©‚Á‚½B@

Taken together, these results are consistent with a growing body of evidence which generally suggests that environmental EMF exposure has little or no effect on the parameters measured in this report.
@
‚±‚ê‚ç‚Ì‚±‚Æ‚©‚çAŠÂ‹«’†‚Ì“dŽ¥ŠE–\˜I‚́A‰e‹¿‚ª‚È‚¢‚Æ‚¢‚¦‚éB@

Environ Health Perspect 109:501-507 (2001). [Online 9 May 2001]@

’F‘S•¶‚ð“Ç‚Ü‚¸‚É‚±‚ÌŠT—v‚¾‚¯‚ł́A‚¤‚Ü‚­‰¼–󂪂ł«‚È‚¢B@‚±‚ÌŒ¤‹†‚ł̓ƒ‰ƒgƒjƒ“‰¼à‚͔ے肳‚ꂽ‚±‚Æ‚É‚È‚éB

 

•Åƒgƒbƒv‚Ö–ß‚é

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‚R‚UDE‹Æ“I‚È“dŽ¥ŠE–\˜I‚ÆŽ©ŽE@

@@@@ì¬G‚Q‚O‚O‚R|‚R|‚Q‚Q@@

ŒfÚŽFJournal of Occupational and Environmental Medicine@Volume 45 o Number 1 o January 2003@
˜_•¶–¼FAn Exploratory Investigation of Suicide and Occupational Exposure@@
    
@@E‹Æ“I‚È–\˜I‚ÆŽ©ŽE‚ÌŠÖŒW@
Œ¤‹†ŽÒFEdwin van Wijngaarden, PhD@

ŠT—v@
This exploratory study evaluated the association between suicide and occupational exposure electromagnetic fields, pesticides, and hydrocarbon solvents.
‚±‚ÌŒ¤‹†‚Å‚ÍŽ©ŽE‚ƐE‹Æ“I‚È“dŽ¥ŠE–\˜IAŽE’ŽÜA’Y‰»…‘f‚Ì—nÜ‚Æ‚ÌŠÖŒW‚𒲂ׂ½B

The study population comprised 11,707 suicide deaths and 132,771 eligible controls identified from United States death certificate files for the years 1991 and 1992.
1991-92”N‚̃AƒƒŠƒJ‚ÌŽ€–Sf’f‘‚ð—˜—p‚µA11707Œ‚ÌŽ©ŽEiÇ—áj‚Æ132771Œ‚Ì‘ÎÆ‚ðŒ¤‹†‘ΏۂƂµ‚½B@

Exposure assignment was based on job title reported on the death certificates.@
–\˜I‚ÍŽ€–Sf’f‘‚É‹LÚ‚³‚ꂽE‹Æ‚ð—p‚¢‚½BE‹Æ“I‚É“dŽ¥ŠE‚É–\˜I‚·‚é‚Æ‘z’肳‚ê‚éE‹Æ‚ɂ‚¢‚Ä‚¢‚½l‚ðÇ—á‚Æ‚µ‚½B

Exposure to electromagnetic fields and pesticides was weakly associated with suicide risk, while little evidence for an increased risk was seen for hydrocarbon solvents.
E‹Æ“I‚É“dŽ¥ŠE‚É–\˜I‚µ‚Ä‚¢‚éê‡‚ÆŽE’ŽÜ‚ðŽg—p‚µ‚Ä‚¢‚éE‹Æ‚ɂ‚¢‚Ä‚¢‚½l‚́AŽ©ŽE‚̃ŠƒXƒN‚ª­‚µã¸‚µ‚Ä‚¢‚éB‚µ‚©‚µA’Y‰»…‘f‚Ì—nÜ‚ðŽg—p‚µ‚Ä‚¢‚éE‹Æ‚ɂ‚¢‚Ä‚¢‚½l‚ÌŽ©ŽE‚̃ŠƒXƒN‘‰Á‚Í‚È‚©‚Á‚½B

The association for electromagnetic field exposure was highest for suicide between the ages 20 and 35 (odds ratio; OR = 1.5), while the highest risk of suicide for pesticide exposure was seen between the ages of 35 and 49 years (OR = 1.5).@
“dŽ¥ŠE‚É‚æ‚鎩ŽE‚̃ŠƒXƒN‚Í20-35Î‚̐l‚ō‚‚­AƒIƒbƒY”ä‚Í1.5(CI:1.2-1.9)A35-49Î‚̐l‚Å‚ÍŽE’ŽÜ‚ªƒŠƒXƒN‚Æ‚µ‚č‚‚­AƒIƒbƒY”ä1.50(CI:1.3-1.8)‚Å‚ ‚Á‚½B@

Further investigation to replicate these findings seems warranted, using higher quality occupational data.@
‚æ‚萸–§‚ȐE‹Æ–\˜Ió‹µ‚ð”cˆ¬‚µ‚½Œ¤‹†‚ÌŒp‘±‚ª•K—v‚Å‚ ‚éB@

ƒRƒƒ“ƒgF@
Ž€–Sf’f‘‚É‹LÚ‚³‚ꂽE‹Æ‚¾‚¯‚ŁA“dŽ¥ŠE‚â—nÜAŽE’ŽÜ‚Ö‚Ì–\˜I‚𐄒肵‚Ä‚¨‚èAÚ×‚ȐE‹Æ“I‚È–\˜I•]‰¿‚ª•K—v‚ŁA‚±‚ÌŒ¤‹†‚¾‚¯‚Å‚ÍŒ‹˜_‚͏o‚¹‚È‚¢B@
Œ´’˜‚ðŒ©‚ê‚΁AƒAƒƒŠƒJ‚ð’nˆæ“I‚É•ª‚¯‚½‚¾‚¯‚ŁA“ì•”‚ɑ΂µ‚Đ¼•”‚ɏZ‚Þ‚Æ‚¢‚¤‚¾‚¯‚ÅŽ©ŽE‚̃ŠƒXƒN‚̓IƒbƒY”ä1.4(CI:1.2-1.3)‚Æ‘‰Á‚µ‚Ä‚¢‚éB@

Œ¤‹†ŽÒ‚æ‚è˜_•¶‚̃Rƒs[‚ð“üŽèB ‹»–¡‚Ì‚ ‚é•û‚́AŒ´’˜‚ð“üŽè‚µ‚Ä‚­‚¾‚³‚¢B

 

•Åƒgƒbƒv‚Ö–ß‚é

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‚R‚VDƒIƒ‰ƒ“ƒ_‚Ì‘—“dü‚ƃKƒ“‚̉uŠwŒ¤‹†@1993”N@


ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½B@ì¬F@‚Q‚O‚O‚R|‚R|‚Q‚R@

ŒfÚŽFInternational Journal of Epidemiology, Vol 22, 9-15, 1993
˜_•¶–¼FCancer mortality and residence near electricity transmission equipment: a retrospective cohort study
‚ˆ³‘—“dü‹ß–T‚ɏZ‚Þ‚±‚Æ‚ÆŠàŽ€–S—¦‚ÌŠÖŒW‚ÌŒã‚ëŒü‚«‚̃Rƒz[ƒgŒ¤‹†@
Œ¤‹†ŽÒFGH Schreiber, GM Swaen, JM Meijers, JJ Slangen and F Sturmans
Department of Epidemiology, University of Limburg, Maastricht, The Netherlands.

ŠT—vF@
Several studies in recent years have raised the possibility that exposure to extreme low frequency (ELF) electromagnetic fields may be hazardous to human health, in particular by the promotion or initiation of leukemia and other cancers.
Å‹ß‚ÌŒ¤‹†‚É‚æ‚ê‚΁A’áŽü”g“dŽ¥ŠE‚Ö‚Ì–\˜I‚ª”’ŒŒ•a‚â‚»‚Ì‘¼‚̃Kƒ“‚̃CƒjƒVƒG[ƒ^‚âƒvƒƒ‚[ƒ^‚Æ‚µ‚Ä“­‚«Al‚ÌŒ’N‚ÉŠQ‚ª‚ ‚é‚©‚à‚µ‚ê‚È‚¢‚Æ‚¢‚¤‚±‚Æ‚ªŒ¾‚í‚ê‚Ä‚¢‚éB

To determine if this exposure creates a long-term hazard to the public, the mortality of a group of people identified as having lived in an urban quarter of Maastricht in which two 150 kilo-Volt (kV) power lines and one transformer substation are located was investigated.
ŒöO‚ÌŒ’N‚Ö‚Ì’·Šú“I‚ȏáŠQ‚ª‚ ‚é‚©‚𒲂ׂ邽‚߂ɁAƒIƒ‰ƒ“ƒ_‚̃}[ƒXƒgƒŠƒbƒqxŠO‚ŁA“ñ‚‚̂P‚T‚O‚‹‚u‘—“dü‚Æ•Ï“dŠ‚Ì‚ ‚é’nˆæ‚ɏZ‚ސl‚ÌŽ€–S—¦‚𒲍¸‚µ‚½B

Using the Dutch population registry it was possible to identify retrospectively 3549 inhabitants of the quarter who lived there for at least 5 years between 1956 and 1981.
Z–¯“o˜^‚©‚çA1956-1981”N‚̊Ԃɏ­‚È‚­‚Æ‚à5”NŠÔZ‚ñ‚¾lA3549–¼‚ð‘I‘ð‚µ‚½B

Of these 1552 study subjects lived within 100 m of the electricity transmission equipment and were exposed to magnetic field intensity of 1.0-11.0 milli-Gauss.
1552
–¼‚́A‘—“dÝ”õ‚©‚ç‚P‚O‚O‚ˆÈ“à‚ɏZ‚ñ‚Å‚¢‚āA‚P|‚P‚Oƒ~ƒŠƒKƒEƒX‚ÌŽ¥ŠE‚𗁂тĂ¢‚½B

The overall standardized mortality ratio and cancer mortality ratios were either not or only slightly elevated.
Ž¥ŠE–\˜I‚É‚æ‚é‘S‘Ì‚Ì•W€‰»Ž€–S—¦”ä‚ƃKƒ“Ž€–S—¦”ä‚̉e‹¿‚́A‚Æ‚à‚ɉe‹¿‚µ‚È‚¢A‚©A‚à‚µ‚­‚͎኱‚Ì‘‰Á‚Å‚ ‚Á‚½B

The study does not support previously reported associations of exposure to ELF electromagnetic fields with leukemia, brain cancer and breast cancer.

‚±‚ÌŒ‹‰Ê‚́A‚±‚ê‚Ü‚Å‚ÌŒ¤‹†‚ÅŒ¾‚í‚ê‚Ä‚¢‚éu’áŽü”g“dŽ¥ŠE‚ª”’ŒŒ•aA”]Žîᇂâ“û‚ª‚ñ‚𑝔­‚³‚¹‚év‚Æ‚¢‚¤‚±‚Æ‚ðŽxŽ‚µ‚È‚¢B

 

•Åƒgƒbƒv‚Ö–ß‚é

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‚R‚WDFinland‘ål‚̃Kƒ“’áŽü”gŽ¥ŠE‚ÌŠÖŒW1996”N@

ì¬G‚Q‚O‚O‚R|‚R|‚Q‚T@

ŒfÚŽFBMJ 1996;313:1047-1051 (26 October)
˜_•¶–¼FMagnetic fields of high voltage power lines and risk of cancer in Finnish adults: nationwide cohort study
ƒtƒBƒ“ƒ‰ƒ“ƒh‘S“y‚É‚¨‚¯‚鍂ˆ³‘—“dü‚©‚ç‚ÌŽ¥ŠE‚Æ‘ål‚̃Kƒ“ƒŠƒXƒN‚ÉŠÖ‚·‚éƒRƒz[ƒgŒ¤‹†@
Œ¤‹†ŽÒFPia K Verkasalo, researcher,a Eero Pukkala, researcher,b Jaakko Kaprio, senior research fellow,a Kauko V Heikkila, systems analyst,a Markku Koskenvuo, professor c @a Department of Public Health, PO Box 41, FIN-00014 University of Helsinki, Finland, @

Abstract
@
Objective: To investigate the risk of cancer in association with magnetic fields in Finnish adults living close to high voltage power lines.
–Ú“IGƒtƒBƒ“ƒ‰ƒ“ƒh‚̍‚ˆ³‘—“dü‚Ì‹ß–T‚̏Z‚Þ‘ål‚ªAŽ¥ŠE–\˜I‚É‚æ‚éƒKƒ“ƒŠƒXƒN‚𒲍¸‚·‚éB

Design: Nationwide cohort study.
@•ûŽ®F‘S‘‚ð‘ΏۂƂµ‚½ƒRƒz[ƒgŒ¤‹†

Subjects: 383 700 people who lived during 1970-89 within 500 metres of overhead power lines of 110-400 kV in a magnetic field calculated to be >/=0.01 µT. Study subjects were identified by record linkages of nationwide registers.
Œ¤‹†‘ΏہF110-400‚‹‚u‚ˆ³‘—“dü‚Ì‚T‚O‚O‚ˆÈ“à‚ɁA1970|1989”N‚ɏZ‚ñ‚Å‚¢‚āA„’莥ŠE–\˜I—Ê‚ª0.01ƒÊ‚sˆÈã‚Å‚ ‚é387700–¼‚ŁAZ–¯“o˜^‚©‚甲‚«o‚µ‚½B

Main outcome measures: Numbers of observed and expected cases of cancer, standardised incidence ratios, and incidence rate ratios adjusted for sex, age, calendar year, and social class--for example, by continuous cumulative exposure per 1 µT year--with 95% confidence intervals from multiplicative models for all cancers combined and 21 selected types.
Žå‚ÈŽw•WF•W€‰»œëŠ³—¦A«E”N—î‚È‚Ç‚Å’²®‚µ‚½œëŠ³—¦”äA—ݐϖ\˜I‚Æ‚ÌŠÖŒW‚ȂǂŁA21Ží‚̃Kƒ“‚ÉŠÖ‚µ‚ĉðÍ‚ðs‚Á‚½B

Results: Altogether 8415 cases of cancer were observed (standardised incidence ratio 0.98; 95% confidence interval 0.96 to 1.00) in adults. All incidence rate ratios for both sexes combined were non-significant and between 0.91 and 1.11.
8415
Œ‚Ì‘S‚ª‚ñ‚ª‚ ‚èAˆê”ʂ̜늳—¦‚É”äŠr‚µ‚½‘—“dü‹ß–T‚ɏZ‚ސl‚Ì•W€‰»œëŠ³—¦‚Í‚OD‚X‚W‚Å‚ ‚éB‚»‚ꂼ‚ê‚̃Kƒ“‚Å‚Ý‚½‚Æ‚«‚̜늳—¦”ä‚́A’j—‚ð‡ŽZ‚µ‚½ê‡‚́A‚OD‚X‚P‚©‚ç‚PD‚P‚P‚Å‚ ‚èA—LˆÓ‚Å‚Í‚È‚¢B

Significant excesses were observed in multiple myeloma in men (incidence rate ratio 1.22) and in colon cancer in women (1.16).
—LˆÓ‚ȃŠƒXƒN‘‰Á‚́A’j«‚É‚¨‚¯‚鍜‘×–EŽî‚ŁAœëŠ³—¦”ä‚PD‚Q‚QA—«‚É‚¨‚¯‚éŠÌ‘Ÿ‚ªƒ“iœëŠ³—¦”ä‚PD‚P‚Uj‚Å‚ ‚Á‚½B

Conclusions: Typical residential magnetic fields generated by high voltage power lines do not seem to be related to the risk of overall cancer in adults. The previously suggested associations between extremely low frequency magnetic fields and tumours of the nervous system, lymphoma, and leukaemia in adults and breast cancer in women were not confirmed.
Œ‹˜_G‚ˆ³‘—“dü‚Ì‹ß–T‚ɏZ‚ÝŽ¥ŠE‚É–\˜I‚µ‚Ä‚¢‚é‘ål‚̏Z–¯‚ɁAƒŠƒXƒN‚Ì‘‰Á‚́A‘S”Ê“I‚ÉŒ©‚ê‚΁A‚È‚¢B’áŽü”gŽ¥ŠE–\˜I‚É‚æ‚é”]ŽîᇁAƒŠƒ“ƒpŽîA”’ŒŒ•aA—«‚Ì“û‚ª‚ñ‚̃ŠƒXƒN‚ª‘‰Á‚·‚é‚Æ‚¢‚¤‰ß‹Ž‚ÌŒ¤‹†‚ðA–{Œ¤‹†‚Å‚ÍŠm”F‚Å‚«‚È‚©‚Á‚½B


Œ´’˜‚É‚ ‚éƒf[ƒ^‚̈ꕔ
‚PD—ݐϖ\˜I—Ê‚Ì•p“x@
Cumulative exposure (µT years)
@@@•p“x@lE”NiŠ„‡“j@
 0.20
ˆÈ‰º                      @    2 040 700 @(80.2)
 0.20-0.39                            222 800
@@(8.8)@
 0.40-0.99                            170 200    (6.7)
 1.00-1.99                             61 700    (2.4)
 2.00
ˆÈã                         @   47 800@  (1.9)


‚QDƒKƒ“‚̃ŠƒXƒN@@Še—“‚ɁAÇ—ᐔA•W€‰»œëŠ³—¦”ä@M—Š«‹æŠÔ‚ðŽ¦‚·

Ž¥ŠE–\˜I

ƒÊTE”N

‘S‚ª‚ñ

”]Žîá‡

”’ŒŒ•a

 

‘SÇ—ᐔn=8415

‘SÇ—ᐔn = 301

‘SÇ—ᐔn = 203

0.20ˆÈ‰º

6393;0.98(0.96-1.01)

238;0.94(0.82-1.06)

156;0.96(0.82-1.13)

0.20|0.39

877;0.98(0.91-1.04)

35;1.10(0.77-1.53)

23;1.06(0.68-1.60)

0.40|0.99

695;0.97(0.90-1.04)

16;0.64(0.37-1.04)

15;0.87(0.49-1.43)

1.00|1.99

230;0.89(0.78-1.01)

5;0.55(0.18-1.28)

5;0.81(0.26-1.88)

2.00ˆÈã

220;0.92(0.81-1.05)

7;0.92(0.37-1.89)

4;0.71(0.19-1.81)

 

•MŽÒ‚Ì’F
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’²¸‘ΏۊúŠÔ‚ª’·‚¢‚̂ŁA“¯ˆêêŠ‚ɍŒá‚T”NZ‚ñ‚Å‚¢‚é‚Æ‚·‚ê‚΁AÅãˆÊ‚̍‚–\˜IŒQ‚Å‚ ‚é2ƒÊTE”N‚̏ꍇ‚́A0.‚SƒÊT‚ª•½‹ÏŽ¥ŠE–\˜I‚Å‚ ‚é‚Ɖ¼’è‚·‚ê‚΁B‘¼‚̉uŠw’²¸‚Æ—ªˆê’v‚·‚éƒJƒbƒgƒ|ƒCƒ“ƒg‚Æ‚È‚éB


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‚R‚XDAhlbom‚ÌŽ¥ŠE‚Ə¬Ž™‚ªƒ“‚̃v[ƒ‹•ªÍ


u0.4ƒÊ‚sˆÈã‚Ì’áŽü”gŽ¥ŠE‚ŏ¬Ž™‚ªƒ“‚̃ŠƒXƒN2”{v‚Æ‚¢‚¤Œ³‚É‚È‚Á‚½˜_•¶‚Å‚·B

ŠT—v‚ɉ¼–ó‚ð‚‚¯‚½B@ì¬F@‚Q‚O‚O‚R|‚S|‚S@

ŒfÚŽFBritish Journal of Cancer. September 2000, Volume 83, Number 5, Pages 692-698
˜_•¶–¼GA pooled analysis of magnetic fields and childhood leukemia
@@@@Ž¥ŠE‚Ə¬Ž™‚ªƒ“‚̃v[ƒ‹•ªÍ@
Œ¤‹†ŽÒFA Ahlbom, N Day, M Feychting, E Roman, J Skinner, J Dockerty, M Linet, M McBride, J Michaelis, J H Olsen, T Tynes and P K Verkasalo

Abstract
FŠT—v
Previous studies have suggested an association between exposure to 5060 Hz magnetic fields (EMF) and childhood leukemia.
‰ß‹Ž‚ÌŒ¤‹†‚ł́A‚T‚OE‚U‚O‚g‚šŽ¥ŠE–\˜I‚Ə¬Ž™”’ŒŒ•a‚ÌŠÖŒW‚Í’ñ‹N‚³‚ê‚Ä‚¢‚½B

We conducted a pooled analysis based on individual records from nine studies, including the most recent ones.
–{Œ¤‹†‚ł́AÅ‹ß‚ÌŒ¤‹†‚ðŠÜ‚ñ‚Å9Œ‚̌X‚ɍs‚í‚ê‚Ä‚«‚½Œ¤‹†‚ðAˆêŠ‡‚µ‚ăv[ƒ‹‰ðÍ‚ðs‚Á‚½B

Studies with 24/48-hour magnetic field measurements or calculated magnetic fields were included.
24
E‚S8ŽžŠÔŽ¥ŠE‘ª’è‚ðs‚Á‚½Œ¤‹†AŽ¥ŠE–\˜I‚ðŒvŽZ‚Ő„’肵‚½Œ¤‹†‚È‚Ç‚ðŠÜ‚ñ‚Å‚¢‚éB
We specified which data analyses we planned to do and how to do them before we commenced the work.
Œ¤‹†‚Ì’…Žè‚ɐ旧‚Á‚āA‚ǂ̃f[ƒ^‚ðA‚ǂ̂悤‚ɉðÍ‚·‚é‚©‚ðŒŸ“¢‚µ‚½B

The use of individual records allowed us to use the same exposure definitions, and the large numbers of subjects enabled more precise estimation of risks at high exposure levels.
Ž¥ŠE–\˜I•]‰¿‚ª“¯‚¶ó‘Ô‚Å‚ ‚éŒÂX‚ɍs‚í‚ꂽŒ¤‹†ƒf[ƒ^‚ðŽg—p‚µ‚āA‘½‚­‚̏Ǘá‚Æ‚µ‚臎Z‚·‚邱‚Æ‚©‚çA‚”˜˜IŒQ‚É‚¨‚¢‚āA‚æ‚茵–§‚È•]‰¿‚ðs‚¤‚±‚Æ‚ª‚Å‚«‚½B

For the 3203 children with leukemia and 10 338 control children with estimated residential magnetic field exposures levels < 0.4  T, we observed risk estimates near the no effect level, while for the 44 children with leukemia and 62 control children with estimated residential magnetic field exposures  0.4  T the estimated summary relative risk was 2.00 (1.273.13), P value = 0.002).
3203
‚̏¬Ž™”’ŒŒ•a‚̏Ǘá‚Æ10338‚̑ΏƌQ‚©‚çAZŠÂ‹«‰º‚Ő„’è’l0.4ƒÊ‚sˆÈ‰º‚Ì–\˜I‚ł̓ŠƒXƒN‚Ì‘‰Á‚Í‚È‚¢B„’è’l0.4ƒÊ‚sˆÈã‚ÌŽ¥ŠE–\˜IŒQ‚́A¬Ž™”’ŒŒ•a‚̏ǗႪ44Œ‚ ‚èA‘ΏƌQ‚Í62Œ‚Å‚ ‚èA‘Š‘΃ŠƒXƒN‚Í2.00iM—Š‹æŠÔF1.27-3.13j‚Æ‚È‚Á‚½B

Adjustment for potential confounding variables did not appreciably change the results.

Œð—ˆöŽq‚̉e‹¿‚Í‚È‚©‚Á‚½B
For North American subjects whose residences were in the highest wire code category, the estimated summary relative risk was 1.24 (0.82-1.87). Thus, we found no evidence in the combined data for the existence of the so-called wire-code paradox.
–k•Ä‚ōs‚í‚ꂽŒ¤‹†‚ð‘ΏۂɁAƒƒCƒ„ƒR[ƒh‚ʼnðÍ‚ðs‚Á‚½B‚à‚Á‚Æ‚à‚”˜˜I‚Æ‚³‚ê‚éŒQ‚Å‚Ì‘Š‘΃ŠƒXƒN‚Í1.24(M—Š‹æŠÔ0.82-1.87)‚Å‚ ‚èAƒƒCƒ„ƒR[ƒh‚Æ‚Ì‘ŠŠÖ‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

In summary, the 99.2% of children residing in homes with exposure levels < 0.4  T had estimates compatible with no increased risk, while the 0.8% of children with exposures  0.4  T had a relative risk estimate of approximately 2, which is unlikely to be due to random variability.
‚Ü‚Æ‚ß‚é‚ƁA99.2“‚ÌŽq‹Ÿ‚͏ZŠÂ‹«‰º‚Å0.4ƒÊ‚sˆÈ‰º‚ÌŽ¥ŠE–\˜I‚Å‚ ‚èAƒŠƒXƒN‚Ì‘‰Á‚Í‚È‚©‚Á‚½Bˆê•ûA0.8“‚ÌŽq‹Ÿ‚Í0.4ƒÊ‚sˆÈã‚ÌŽ¥ŠE–\˜I‚ðŽó‚¯AƒŠƒXƒN‚ª2‚Æ‚È‚èA‹ô‘R‚ÌŒ‹‰Ê‚Å‚ ‚é‚Æ‚Í‚¢‚¦‚È‚¢Œ‹‰Ê‚Æ‚È‚Á‚½B

The explanation for the elevated risk is unknown, but selection bias may have accounted for some of the increase.
@
‰½‚ª‚±‚̃ŠƒXƒN‚𑝉Á‚³‚¹‚Ä‚¢‚é‚Ì‚©‚Í’è‚©‚Å‚Í‚È‚¢BƒŠƒXƒN‘‰Á‚ªu‘I‘ðƒoƒCƒAƒXv‚̉”\«‚ª‚ ‚éB


•Åƒgƒbƒv‚Ö–ß‚é

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‚S‚OD@Ž¥ŠE‚Æ‘ål‚Ì”’ŒŒ•a‚̃ŠƒXƒN@

@ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½@ì¬F‚Q‚O‚O‚R|‚S|‚P‚O@

ŒfÚŽFAmerican Journal of Epidemiology, Vol 128, Issue 1 10-20,1988
˜_•¶–¼FAcute nonlymphocytic leukemia and residential exposure to power frequency magnetic fields@
ZŠÂ‹«‰º‚Ì“d—ÍŽü”g”Ž¥ŠE–\˜I‚Æ‹}«”ñƒŠƒ“ƒp«”’ŒŒ•a‚̃ŠƒXƒN
Œ¤‹†ŽÒFRK Severson, RG Stevens, WT Kaune, DB Thomas, L Heuser, S Davis and LE Sever
Japan-Hawaii Cancer Study, Kuakini Medical Center, Honolulu 96817.

ŠT—vF
Recent research has suggested that non-ionizing radiation in the form of power-frequency magnetic fields may play some role in carcinogenesis in general and in acute nonlymphocytic leukemia in particular.
Å‹ß‚ÌŒ¤‹†‚É‚æ‚ê‚Δñ“d—£•úŽËü‚́A“Á‚É‘SE‹}«”ñƒŠƒ“ƒp«”’ŒŒ•a‚ÉŠÖ‚µ‚āA‚ ‚éŽí‚Ì”­ƒKƒ“Œ´«‚ðŽ‚Á‚Ä‚¢‚é‚©‚à‚µ‚ê‚È‚¢‚Æ‚¢‚í‚ê‚Ä‚¢‚éB

Much of the epidemiologic evidence is preliminary in nature and the methods of previous studies have been criticized.
‚±‚ê‚Ü‚Å‚Ì‘½‚­‚̉uŠwŒ¤‹†Œ‹‰Ê‚Í—\”õ“I‚È‚à‚Ì‚Å‚ ‚èA”á”»‚³‚ê‚Ä‚à‚¢‚éB

In order to further evaluate this hypothesis, a population-based case-control study of adult acute nonlymphocytic leukemia and residential exposure to power-frequency magnetic fields was carried out in western Washington state.
‚±‚ê‚ç‚̉¼à‚ðŒŸØ‚·‚邽‚߂ɁA¬l‚Ì‹}«”ñƒŠƒ“ƒp«”’ŒŒ•a‚ƏZŠÂ‹«‰º‚É‚¨‚¯‚é“d—ÍŽü”g”Ž¥ŠE–\˜I‚Æ‚ÌŠÖŒW‚ðAƒƒVƒ“ƒgƒ“B¼•”‚É‚¨‚¢‚āA’²¸‚µ‚½B

Analyses were based on 114 cases who were newly diagnosed from 1981 to 1984 and identified from a population-based cancer registry, and 133 controls who were chosen from the study area by random digit dialing.
1981
”N‚©‚ç1984”N‚É‚©‚¯‚ĐV‚½‚É‚ª‚ñ‚Ɛf’f‚³‚ꂽ114‚̏Ǘá‚ð‘SlŒû‚ð‘ΏۂƂµ‚½‚ª‚ñ“o˜^‚©‚甲‚«o‚µ‚½B‚»‚µ‚ă‰ƒ“ƒ_ƒ€ƒ_ƒCƒ„ƒ‹‚Å133‚̑ΏƌQ‚ð‘I‘ð‚µ‚½B

Magnetic field exposure was estimated from external electrical wiring configurations within 140 ft (42.7 m) of each subject's residence.
Ž¥ŠE–\˜I‚ÍŒ¤‹†‘Ώێ҂̏Z‹‚Ì‚S‚QD‚V‚ˆÈ“à‚É‚ ‚é‘—“düE”z“dü‚̏󋵂©‚ç”»’肵‚½B

In addition, magnetic fields were measured inside the subject's residence at the time of interview.
‰Á‚¦‚āAŒ¤‹†‘Ώێ҂Ƃ̃Cƒ“ƒ^ƒrƒ…[‚Ì‚Æ‚«‚ɁA‰Æ‚Ì’†‚ÅŽ¥ŠE‚𑪒肵‚½B

Neither the directly measured magnetic fields nor the surrogate values based on the wiring configurations were associated with acute nonlymphocytic leukemia.
Ž¥ŠE‚ÌŽÀ‘ª’l‚ʼnðÍ‚µ‚Ä‚àA‘—“düE”z“dü‚©‚琄’肵‚½Ž¥ŠE–\˜I‚ʼnðÍ‚µ‚Ä‚àA‹}«ƒŠƒ“ƒp«”’ŒŒ•a‚Æ‚ÌŠÖŒW‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

 

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‚S‚PDŽ¥ŠE–\˜I‚ÆŽq‹Ÿ‚Ì”]ŽîᇃŠƒXƒN@


ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½@@ì¬F@‚Q‚O‚O‚R|‚S|‚P‚P

ŒfÚŽFAmerican Journal of Epidemiology, Vol 143, Issue 2 105-119, 1996
˜_•¶–¼FLos Angeles study of residential magnetic fields and childhood brain tumors
ZŠÂ‹«‰º‚ÌŽ¥ŠE–\˜I‚ÆŽq‹Ÿ‚Ì”]ŽîᇂƂ̊֌W‚ÉŠÖ‚·‚郍ƒXƒAƒ“ƒWƒFƒ‹ƒX’n‹æ‚ÌŒ¤‹†
@
Œ¤‹†ŽÒFS Preston-Martin, W Navidi, D Thomas, PJ Lee, J Bowman and J Pogoda
Department of Preventive Medicine, University of Southern California School of Medicine, Los Angeles 90033-9987, USA.

ŠT—vF
A measurement study of residential magnetic fields and brain tumors in children that was added onto an ongoing case-control interview study in Los Angeles County, California, include 298 children under age 20 years with a primary brain tumor diagnosed from 1984 to 1991 and 298 control children identified by random digit dialing.

Œ»Ýis’†‚̃ƒXƒAƒ“ƒWƒFƒ‹ƒX’n‹æ‚É‚¨‚¯‚éÇ—á‘Ώƌ¤‹†‚̈êŠÂ‚Æ‚µ‚āAZŠÂ‹«‰º‚É‚¨‚¯‚鎥ŠE‚ÌŽÀ‘ª’l‚É‚æ‚é–\˜I•]‰¿‚ðs‚¢AŽq‹Ÿ‚Ì”]Žîᇂ̃ŠƒXƒN‚ð‰ðÍ‚µ‚½B1984-1991”N‚ÌŠÔ‚É20ÎˆÈ‰º‚Å”]Žîᇁi‘¼‚Ì•”ˆÊ‚Ì‚ª‚ñ‚©‚ç‚Ì“]ˆÚ‚Å‚Í‚È‚¢j‚Ɛf’f‚³‚ꂽ298‚̏Ǘá‚ƁAƒ‰ƒ“ƒ_ƒ€ƒ_ƒCƒ„ƒ‹‚Å‘I‘ð‚µ‚½298‚̑ΏƂƌ¤‹†‘ΏۂƂµ‚½B

Magnetic fields were determined for all Los Angeles homes where these 596 children lived from conception to diagnosis (1,131 homes) by mapping and coding the wiring configurations outside the home and by taking a series of exterior spot and profile measurements.

”DP‚©‚炪‚ñ‚Ɛf’f‚³‚ê‚é‚Ü‚Å‚É596–¼‚ÌŽq‹Ÿ‚ªZ‚ñ‚Å‚¢‚½ƒƒXƒAƒ“ƒWƒFƒ‹ƒX’n‹æ‚̏Z‘îA‡Œv‚PC‚P‚R‚PŒ¬‚ð‘ΏۂɁAƒƒCƒ„ƒR[ƒh‚̏󋵔cˆ¬‚ƁA‰Æ‚ÌŽüˆÍ‚ł̃Xƒ|ƒbƒg‘ª’è‚Æ‹óŠÔ•ª•z‚Ì’²¸‚ŁAŽ¥ŠE–\˜I‚ð•]‰¿‚µ‚½B

In addition, for a subset of subjects (35%; 211 homes) 24-hour measurements were taken in the child's room and one other room.
‰Á‚¦‚āAŒ¤‹†‘Ώۂ̂R‚T“A211–¼‚ɑ΂µ‚ẮAŽq‹Ÿ•”‰®‚Æ‚»‚Ì‘¼‚Ì‚à‚¤‚ЂƂ‚̕”‰®‚Å‚Ì24ŽžŠÔ˜A‘±Ž¥ŠE‘ª’è‚ðs‚Á‚½B

Although measured fields are consistently highest in the highest of the five wire code categories, fields in homes in this category are much lower in Los Angeles than in Denver, where the code originated.
Ž¥ŠE‹­“x‚́AƒƒCƒ„ƒR[ƒh‚ÅÅ‚à‚‚¢‚Æ‚³‚ê‚éƒJƒeƒSƒŠ[‚ł́AŽÀ‘ª’l‚ªÅ‚à‚‚¢”Žš‚ðŽ¦‚µ‚Ä‚¢‚邪A‚±‚Ì‹­“x‚̓fƒ“ƒo[iƒƒCƒ„ƒR[ƒh‚Å‚Ì•]‰¿‚ð’ñ¥‚µ‚½Å‰‚ÌŒ¤‹†j‚Å‚Ì’l‚É”ä‚ׂé‚Æ’á‚©‚Á‚½B

Brain tumor risk appears not to relate to measured fields inside (p for trend for child's room = 0.98) or outside (p for trend for front wall = 0.82) the home.
”]Žîᇂ̃ŠƒXƒN‚ÍŽÀ‘ª‚µ‚½Ž¥ŠE‚ʼnðÍ‚·‚é‚ƁA‰®“à‚Å‚ÌŽ¥ŠE‚Æ‚ÌŠÖŒW‚Å‚Í‚OD‚X‚WA‰®ŠO‚Å‚ÌŽ¥ŠE‚Æ‚ÌŠÖŒW‚Å‚Í‚OD‚X‚W‚Å‚ ‚Á‚½B

An apparent increase in risk among children living at diagnosis in homes with underground wiring appears to be an artifact introduced by using current controls for historical cases because this apparent excess risk disappeared in an analysis restricted to the later years of the study when cases and controls were accrued concurrently.
ƒƒCƒ„ƒR[ƒh‚Łu’n’†”züviŽO‰Y’FƒƒCƒ„ƒR[ƒh‚Å‚ÍÅ‚àŽ¥ŠE–\˜I‚ª’á‚¢‚Æ‚³‚ê‚éƒJƒeƒSƒŠ[j‚ŁA”]Žîᇂ̃ŠƒXƒN‘‰Á‚ªŒ©‚ç‚ꂽ‚ªA‚±‚ê‚Í‘¼‚Ì—vˆö‚É‚æ‚錋‰Ê‚Å‚ ‚낤B‚È‚º‚È‚ç‚΁A‚»‚ÌŒã‚ÌŠÖ˜A‚µ‚½Œ¤‹†‚Å‚Í‚±‚̃ŠƒXƒN‚Ì‘‰Á‚͏Á‚¦‹Ž‚Á‚Ä‚¢‚é‚©‚ç‚Å‚éB

Our study does not show an overall association of pediatric
i¬Ž™‚́jbrain tumors with measured fields, with "very high" wiring configurations, or with any of several other potential sources of exposure, such as use of various electrical appliances, but the prevalence of high fields (> 2mG) and very high fields (> 3mG) in Los Angeles homes was too low to detect a moderate effect of the magnitude reported in other studies.

¡‰ñ‚ÌŒ¤‹†‚ł́AŽÀ‘ª‚µ‚½Ž¥ŠE‹­“x‚Æ‚àAƒƒCƒ„ƒR[ƒh‚ŁuHighv‚Æ‚¢‚¤ƒJƒeƒSƒŠ[‚Æ‚àA“¯‚¶‚­uVery@Highv‚Æ‚¢‚¤ƒJƒeƒSƒŠ[‚Æ‚àA‚»‚Ì‘¼‚̉”\«‚Ì‚ ‚鎥ŠE–\˜Ii—áAFX‚È“d‹C‹@Ší‚ÌŽg—pj‚È‚Ç‚ÆŽq‹Ÿ‚Ì”]Žîᇂ̊֘A‚ÍŒ©o‚¹‚È‚©‚Á‚½B‘¼‚ÌŒ¤‹†‚Å•ñ‚³‚ê‚Ä‚¢‚邪‚ñƒŠƒXƒN‚Ì‘‰Á‚Æ‚¢‚¤‚±‚Æ‚ðŒŸo‚·‚é‚ɂ́AƒƒXƒAƒ“ƒWƒFƒ‹ƒX’n‹æ‚Å‚Í‚Qm‚f‚ð’´‚¦‚½‚èA‚Rm‚f‚ð’´‚¦‚½‚è‚·‚éŠÂ‹«‚É‚·‚ñ‚Å‚¢‚él‚ÌŠ„‡‚ª‚©‚È‚è’á‚©‚Á‚½‚Æ‚¢‚¦‚éB

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‚±‚̍€‚ð‘啝‚ɏC³E‰Á•M‚µ‚½B@@‚Q‚O‚O‚X|‚Q|‚S

16ƒ~ƒŠƒKƒEƒXˆÈã‚ÉŽ¥ŠE”˜˜I‚Å”DPˆÙí‚Æ‚¢‚¤î•ñ‚ª‚µ‚΂µ‚Γoê‚µ‚Ü‚·B
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1
jŒ´“T@ŠT—v‚ð‰¼–ó‚µ‚Ü‚µ‚½B
ŒfÚŽFPIDEMIOLOGY 2002@13:9-20
˜_•¶–¼FA Population-Based Prospective Cohort Study of Personal Exposure to Magnetic Fields during Pregnancy and the Risk of Miscarriage
”DP’†‚ÌŽ¥ŠE‚ւ̌l–\˜I‚Æ—¬ŽY‚ÉŠÖ‚·‚é‘OŒü‚«‚̃Rƒz[ƒgŒ¤‹†

Œ¤‹†ŽÒFDe-Kun Li; Roxana Odouli; Soora Wi; Teresa Janevic; Ira Golditch; T. Dan Bracken; Russell Senior; Richard Rankin; Richard Iriye

ŠT—vF
Ž¥ŠE–\˜I‚ª—¬ŽY‚ÉŠÖŒW‚·‚é‚©‚𒲍¸‚·‚邽‚߂ɁA‘å‚«‚ÈŒ’N•ÛŒ¯‘gD‚Ì‘®‚·‚鏗«‚ð‘ΏۂɁA‘OŒü‚«‚̃Rƒz[ƒgŒ¤‹†‚ðs‚Á‚½B
‘I‘ðƒoƒCƒAƒX‚ð­‚È‚­‚·‚邽‚ß‚É‘gD‚É‘®‚·‚é‘Sˆõ‚ð‘ΏۂƂ·‚éPopulation-Based‚ȃRƒz[ƒgŒ¤‹†‚Å‚ ‚éB

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ƒCƒ“ƒ^ƒrƒ…[‚É‚æ‚Á‚āA—¬ŽY‚̃ŠƒXƒN—vˆö‚Æ‚»‚Ì‘¼‚̌𗍈öŽq‚ÉŠÖ‚·‚éî•ñ‚ð“üŽè‚µ‚½B
ŽQ‰ÁŽÒ‚ɂ͍s“®‹L˜^‚Æ‚Æ‚à‚ɁAŽ¥ŠE‘ª’èŠí‚ð24ŽžŠÔŒg‘Ñ‚µ‚Ä‚à‚ç‚Á‚½B

oŽY‚̏󋵂͌’N•ÛŒ¯‘g‡‚̃f[ƒ^ƒx[ƒX‚©‚瓾‚ç‚êAˆãŠw“I‚ȏ󋵂̃`ƒFƒbƒN‚ðs‚¢A“d˜b‚ÅŠm”F‚às‚Á‚½B

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ÅI‰ðÍ‚̑ΏۂƂȂÁ‚½‚Ì‚Í969Œ‚Å‚ ‚éB
Œ‹‰Ê‚Æ‚µ‚āAŽ¥ŠE‚Ì•½‹Ï’l‚ʼnðÍ‚µ‚½ê‡‚́AŽ¥ŠE‚Æ—¬ŽY‚ÌŠÖŒW‚Í‚È‚©‚Á‚½B

Ž¥ŠE–\˜I‚̍őå’l‚ŁA16ƒ~ƒŠƒKƒEƒXˆÈã‚Ì–\˜I‚ðŽó‚¯‚Ä‚¢‚éê‡‚́A—¬ŽY‚̃ŠƒXƒN‚ª‘å‚«‚­‚È‚Á‚½B
Å‘厥ŠE16ƒ~ƒŠƒKƒEƒXˆÈ‰º‚ɑ΂µ‚Ä16ƒ~ƒŠƒKƒEƒXˆÈã‚Ì–\˜I‚ł́A—¬ŽY‚̃ŠƒXƒN‚Í1.8”{iCI:1.2-2.7j‚Å‚ ‚Á‚½B

‚±‚ÌŠÖŒW‚Í”DP‰Šúi10TŠÔˆÈ‘Oj‚Ì—¬ŽY‚Å‚Í‹­‚¢ŠÖŒW‚É‚È‚èA‘Š‘Ί댯“x‚Í2.2iCI:1.2-4.0jAˆÈ‘O‚É—¬ŽY‚ð‚µ‚½‚±‚Æ‚Ì‚ ‚é—¬ŽY‚µ‚â‚·‚¢—«‚̊Ԃł́A‘Š‘Ί댯“x‚Í3.1iCI:1.3-7.7j‚Æ‚È‚Á‚½B

24
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‚±‚ÌŒ¤‹†Œ‹‰Ê‚©‚çA‚ ‚éˆê’èˆÈã‚ÌŽ¥ŠE‚Ö‚Ì–\˜Ii‰Â”\«‚Æ‚µ‚Ä‚Í16ƒ~ƒŠƒKƒEƒXˆÈã‚Æ‚¢‚¤”ŽšjA•½‹Ï’l‚Å‚Í‚È‚­AuŠÔ“I‚ȍőå’l‚Ö‚Ì–\˜I‚ª—¬ŽY‚̃ŠƒXƒN‘‰Á‚Æ‚È‚Á‚Ä‚¢‚é‚Æ‚¢‚¦‚éB
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2
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Å‹ß‚Ì“dŽ¥”g‚Æ”DPˆÙí‚̉uŠwŒ¤‹†‚ɑ΂·‚é‰p‘Doll‚̃Rƒƒ“ƒg
Epidemiology
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‚±‚̉uŠw’²¸‚́A3400–¼‚ð‘ΏۂƂµ‚½Œ¤‹†B
TWA
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‚±‚ÌŒ¤‹†‚ł́AŽQ‰Á—¦‚ª’á‚¢BÇ—á‚ł͌Ăт©‚¯‚ɑ΂µ‚Ä51%‚ªŒ¤‹†‚ɉž‘ø‚µA‘ΏƂłÍ55%‚ª‰ž‘ø‚µ‚Ä‚¢‚é‚ɉ߂¬‚¸AƒZƒŒƒNƒVƒ‡ƒ“ƒoƒCƒAƒX‚ª”rœ‚³‚ê‚Ä‚¢‚È‚¢B@
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‘ΏƂł́A13.2%‚Æ11.7%‚Ƒ卷‚Í‚È‚©‚Á‚½B@

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TWA
‚Å‚ÌŽ¥ŠE”˜˜I‚ł́A3ƒ~ƒŠƒKƒEƒXˆÈã”˜˜I‚µ‚Ä‚¢‚½ê‡‚̃ŠƒXƒN‚Í1.2iCI 0.7-2.2j‚Å‚ ‚èA—LˆÓ‚ȉe‹¿‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

‚µ‚©‚µA‚±‚̉uŠw’²¸Œ¤‹†ŽÒ‚́A‚±‚ê‚Å‚Í–Ê”’‚­‚È‚¢‚Æ‚µ‚āA“–‰‚ÌŒv‰æ‚É‚Í‚È‚¢‘¼‚Ì”˜˜IðŒ‚Æ‚ÌŠÖ˜A«‚ð’T‚èAÅ‘唘˜I’l‚Æ‚ÌŠÖ˜A‚ðŒ©o‚µ‚½B
‚±‚ÌŽè–@‚̓Rƒz[ƒgŒ¤‹†‚Æ‚µ‚Ă͐³‚µ‚¢Žè–@‚Æ‚Í‚¢‚¦‚È‚¢B

3
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3
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EMDEX
‚Í‚à‚Æ‚à‚Æ’·ŠúŠÔ‚ɂ킽‚Á‚Ä”˜˜IŽ¥ŠE‚Ì‹L˜^‚ðŽc‚·‚±‚Æ‚ð”O“ª‚É‚¨‚¢‚čì‚ç‚ꂽ‘ª’èŠí‚ŁA24ŽžŠÔŒg‘Ñ‚µ‚Ä‚àd‚³‚ð‚©‚ñ‚¶‚È‚¢‚悤‚ɂƁAŒy‚­ì‚Á‚Ä‚¢‚Ü‚·B’Z‚¢ŽžŠÔŠÔŠu‚Å‘å—ʂ̃f[ƒ^‚ð‹L˜^‚µ‚悤‚Æ‚·‚ê‚΁A‘ª’èŠí‚Í‘å‚«‚­‚È‚è‚Ü‚·B
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•Åƒgƒbƒv‚Ö–ß‚é

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‚S‚RDŽ¥ŠE‚Ö‚Ì”˜˜I‚ª‘½‚¢‚Æ—¬ŽY‚̃ŠƒXƒN‚ª‘‚·A‚Æ‚¢‚¤‰uŠwŒ¤‹†@

ƒAƒuƒXƒgƒ‰ƒNƒg‚ð“üŽè@‰¼–ó‚ð‚‚¯‚½B@ì¬F@‚Q‚O‚O‚R|‚S|‚Q‚R@

ŒfÚŽFEPIDEMIOLOGY 2002;13:21-31
˜_•¶–¼FA Nested Case-Control Study of Residential and Personal Magnetic Field Measures and Miscarriages  
ZŠÂ‹«‚¨‚æ‚ьl‚ÌŽ¥ŠE‚Ö‚Ì–\˜I‚Æ—¬ŽY‚̃ŠƒXƒN‚ÉŠÖ‚·‚éÇ—á‘Ώƌ¤‹†

Œ¤‹†ŽÒFGeraldine M. Lee; Raymond R. Neutra; Lilia Hristova; Michael Yost; Robert A. Hiatt

From the Environmental Health Investigations Branch California Department of Health Services, Oakland, CA;

ŠT—vF
We conducted a nested case-control study (177 cases, 550 controls) to assess the relation between retrospective magnetic field measures and clinical miscarriage among members of the northern California Kaiser Permanente medical care system.
–kƒJƒŠƒtƒHƒ‹ƒjƒA‚̃ƒfƒJƒ‹ƒPƒAƒVƒXƒeƒ€‚̉ïˆõ‚ð‘ΏۂƂµ‚āAŒã‚ëŒü‚«‚ÌŽ¥ŠE–\˜I•]‰¿‚Æ—¬ŽY‚ÌŠ¯‰v‚𒲍¸‚µ‚½AÇ—á‚Í‚P‚V‚VA‘ΏƂÍ550‚Å‚ ‚Á‚½B@

We also conducted a prospective substudy of 219 participants of the same parent cohort to determine whether 12-week and 30-week exposure assessments were similar.
‚³‚ç‚ɁA‚±‚ÌŒ¤‹†‘ΏۏW’c‚©‚çA219–¼‚Ì‹¦—͎҂𓾂āA‘OŒü‚«‚ÌŒ¤‹†‚ðs‚Á‚½B12TŠÔ‚Æ30TŠÔ‚Ì–\˜I•]‰¿Œ‹‰Ê‚Å‚Ç‚¤‚È‚é‚©‚ðŒ¤‹†‚µ‚½B

We evaluated wire codes, area measures, and three personal meter metrics: (1) the average difference between consecutive levels (a rate-of-change metric), (2) the maximum level, and (3) the time-weighted average.
ƒƒCƒ„ƒR[ƒhA’nˆæ‚Ì–\˜IƒŒƒxƒ‹A‚»‚µ‚Ȑl–\˜I‚ÉŠÖ‚µ‚Ä‚Í•Ï“®‚ÌŠ„‡AÅ‘å’lAŽžŠÔ‚ɏd‚Ý•t‚¯‚µ‚½•½‹Ï‚ð•]‰¿Žw•W‚Æ‚µ‚½B

For wire codes and area measures we found little association.
ƒƒCƒ„ƒR[ƒh‚Æ’nˆæ‚Ì–\˜IƒŒƒxƒ‹‚Å‚Í—¬ŽY‚ÆŽ¥ŠE–\˜I‚Æ‚ÌŠÖ˜A‚Í‚È‚©‚Á‚½B@

For the personal metrics (30 weeks after last menstrual period), we found positive associations.
ŒÂl–\˜IiÅŒã‚ÌŒŽŒo‚©‚ç30TŠÔŒã‚Ì–\˜IƒŒƒxƒ‹j‚ł̓|ƒWƒeƒBƒu‚ÈŠÖŒW‚ª‚ ‚Á‚½B
Each exposure was divided into quartiles, with the lowest quartile as referent.
–\˜I‹­“x‚ð4•ªŠ„‚µAÅ‚à’á‚¢–\˜IŒQ‚ðŽQÆƒŒƒxƒ‹‚Æ‚µ‚½B

Starting with the highest quartile, adjusted odds ratios and 95% confidence intervals were 3.1 (95% CI = 1.6-6.0), 2.3 (95% CI = 1.2-4.4), and 1.5 (95% CI = 0.8-3.1) for the rate-of-change metric; 2.3 (95% CI = 1.2-4.4), 1.9 (95% CI = 1.0-3.5), and 1.4 (95% CI = 0.7-2.8) for the maximum value; and 2.3 (95% CI = 1.2-4.4), 1.9 (95% CI = 1.0-3.5), and 1.4 (95% CI = 0.7-2.8)for the time-weighted average.
‚»‚ꂼ‚ê‚̃IƒbƒY”ä‚́A‚‚¢–\˜IŒQ‚©‚ç’á‚¢‚Ù‚¤‚ÉŒü‚©‚Á‚Ä‚»‚ꂼ‚ê
”˜˜I‚Ì•Ï“®‚ÌŒƒ‚µ‚³‚Å‚Í3.1 (CIF1.6-6.0), 2.3 (CIF1.2-4.4), 1.5 (CIF 0.8-3.1)
Å‘å’l‚ł́A2.3 (CIF1.2-4.4), 1.9 (CIF1.0-3.5), 1.4 (CIF0.7-2.8)
ŽžŠÔ‚ŏd‚Ý•t‚¯‚µ‚½•½‹Ï’l‚Å‚Í2.3 (CIF1.2-4.4), 1.9 (CI:1.0-3.5), 1.4 (CI: 0.7-2.8)‚Å‚ ‚Á‚½B@
—ʁ\”½‰žŠÖŒW‚É‚ ‚éB@

The odds ratio conveyed by being above a 24-hour time-weighted average of 2 milligauss was 1.0 (95% CI = 0.5-2.1).
24ŽžŠÔ‚ÌŽžŠÔ‚ɏd‚Ý•t‚¯‚µ‚½•½‹Ï–\˜I‚Å‚Qƒ~ƒŠƒKƒEƒX‚ð’´‚¦‚Ä‚¢‚é‚ƁAƒIƒbƒY”ä‚Í1.0iCI:0.5-2.1j‚Å‚ ‚Á‚½B

Exposure assessment measurements at 12 weeks were poorly correlated with those taken at 30 weeks.
12
TŠÔ‚ÌŽ¥ŠE–\˜I•]‰¿‚ƁA30TŠÔ‚ÌŽ¥ŠE–\˜I•]‰¿‚Å‚Í‘ŠŠÖ‚ª‚Æ‚ê‚È‚©‚Á‚½B

Nonetheless, the prospective substudy results regarding miscarriage risk were consistent with the nested study results.
‚µ‚©‚µ‚È‚ª‚çA‚±‚Ì‘OŒü‚«‚̃TƒuŒ¤‹†‚Å“¾‚ç‚ꂽ—¬ŽYƒŠƒXƒN‚́A‘¼‚ÌŒ¤‹†‚Æ“¯‚¶Œ‹‰Ê‚Æ‚È‚Á‚Ä‚¢‚éB

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‚S‚SD•ÛˆçŠí“à‚ÌŽ¥ŠE–\˜I‚Ə¬Ž™”’ŒŒ•a@


ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½@ì¬F‚Q‚O‚O‚R|‚S|‚Q‚O@

˜_•¶–¼FChildhood Leukemia and Magnetic Fields in Infant Incubators  
•ÛˆçŠí‚Å‚ÌŽ¥ŠE‚Ö‚Ì–\˜I‚Ə¬Ž™”’ŒŒ•a

Œ¤‹†ŽÒFKarin C. Söderberg; Estelle Naumburg,; Gert Anger; Sven Cnattingius; Anders Ekbom; Maria Feychting@
From
Fthe 1Institute of Environmental Medicine Sweden.@
ŒfÚŽFEPIDEMIOLOGY 2002;13:45-49

ŠT—vF@

In studies of magnetic field exposure and childhood leukemia, power lines and other electrical installations close to the children´s homes constitute the most extensively studied source of exposure.
Ž¥ŠE–\˜I‚Ə¬Ž™”’ŒŒ•a‚ÌŒ¤‹†‚ł́A‹ßÝ‚̍‚ˆ³‘—“dü‚â‘—“dÝ”õ‚ðŽ¥ŠE–\˜IŒ¹‚̑ΏۂƂµ‚Ä‚«‚½B

We conducted a study to assess whether exposure to magnetic fields in infant incubators is associated with an increased leukemia risk.
@
¡‰ñ‚ÌŒ¤‹†‚Å‚Í—cŽ™‚Ì•ÛˆçŠí‚É‚¨‚¯‚鎥ŠE–\˜I‚ª¬Ž™”’ŒŒ•a‚Ì‘‰Á‚ÉŠÖ˜A‚µ‚Ä‚¢‚È‚¢‚©‚𒲍¸‚µ‚½B@

We identified all children with leukemia born in Sweden between 1973 and 1989 from the national Cancer Registry and selected at random one control per case, individually matched by sex and time of birth, from the study base.
ƒXƒEƒF[ƒfƒ“‚Ì‚ª‚ñ“o˜^‚©‚ç1973”N‚©‚ç1989”N‚ɏ¬Ž™‚ªƒ“‚É‚È‚Á‚½Žq‹Ÿ‚𒊏o‚µA«•Ê‚Æ”N—î‚ðƒ}ƒbƒ`‚³‚¹‚½‘ΏƌQ‚ð‘I‘ð‚µ‚½B

We retrieved information about treatment in infant incubators from medical records.
•a‰@‚Ì‹L˜^‚©‚çV¶Ž™•ÛˆçŠí‚Å‚Ì•Ûˆçó‹µ‚̏î•ñ‚ð“üŽè‚µ‚½B

We made measurements of the magnetic fields inside the incubators for each incubator model kept by the hospitals.
•a‰@‚É‚ ‚Á‚½•ÛˆçŠí‚Ì“à•”‚ÌŽ¥ŠE•ª•zó‹µ‚𒲍¸‚µ‚½B

Exposure assessment was based on measurements of the magnetic field level inside the incubator, as well as on the length of treatment.
–\˜I•]‰¿‚́A•ÛˆçŠí“à•”‚ÌŽ¥ŠE‹­“x‚ƁA•ÛˆçŠúŠÔ‚Ì’·‚³‚Å‚¨‚±‚È‚Á‚½B

For acute lymphoblastic leukemia, the risk estimates were close to unity for all exposure definitions.
‹}«ƒŠƒ“ƒp«”’ŒŒ•a‚ÉŠÖ‚µ‚ẮA‘S‚Ä‚Ì–\˜I•]‰¿‚ɑ΂µ‚ăŠƒXƒN‚Ì‘‰Á‚Í‚È‚©‚Á‚½B

For acute myeloid leukemia, we found a slightly elevated risk, but with wide confidence intervals and with no indication of dose response.
‹}«œ‘«”’ŒŒ•a‚ÉŠÖ‚µ‚ẮA­‚µƒŠƒXƒN‚Ì‘‰Á‚ªŒ©‚ç‚ꂽ‚ªAM—Š«‹æŠÔ‚͍L‚­A‚Ü‚½—ʁ\”½‰žŠÖŒW‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

Overall, our results give little evidence that exposure to magnetic fields inside infant incubators is associated with an increased risk of childhood leukemia.
‘S”Ê‚Æ‚µ‚āAV¶Ž™•ÛˆçŠí‚É‚¨‚¯‚鎥ŠE–\˜I‚ª¬Ž™”’ŒŒ•a‚̃ŠƒXƒN‚𑝉Á‚³‚¹‚é‚Æ‚¢‚¤ŠmØ‚Í“¾‚ç‚ê‚È‚©‚Á‚½B


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‚S‚T.’áŽü”gŽ¥ŠE‚ª”]Žî“’‚Ì”­Ç‚ð’x‚点‚é‚Æ‚¢‚¤‰uŠwŒ¤‹†

 

ƒAƒuƒXƒgƒ‰ƒNƒg‚ɑ΂µ‚ĉ¼–ó‚ð‚‚¯‚½B@ì¬G@‚Q‚O‚O‚R]‚V|‚Q‚O@

]—ˆ‚ÍŽ¥ŠE–\˜I‚ªŒ’N‚Ɉ«‚¢‰e‹¿‚ð‚à‚½‚ç‚·‚Æ‚¢‚¤‰uŠw’²¸‚ª‚ ‚Á‚½‚ªA‚±‚ÌŒ¤‹†‚Í‹t‚ŁAŽ¥ŠE–\˜I‚ª”]Žîᇂ̔­¶‚ð’x‚点‚éŒø‰Ê‚ª‚ ‚é‚©‚à‚µ‚ê‚È‚¢A‚Æ‚¢‚¤•ñ‚Å‚ ‚éB
‚±‚Ì•ñ‚̓}ƒCƒNƒƒEƒG[ƒuƒjƒ…[ƒX‚É‚àŒfÚ‚³‚ê‚Ä‚¢‚éB

˜_•¶–¼FElevated Residential Exposure to Power Frequency Magnetic Field Associated With Greater Average Age at Diagnosis for Patients with Brain Tumors@
ZŠÂ‹«‰º‚É‚¨‚¯‚é“d—ÍŽü”g”Ž¥ŠE‚Ö‚Ì”˜˜I‚ª”]Žîᇊ³ŽÒ‚Ì•½‹Ïf’fŽž”N—î‚ðL‚΂µ‚Ä‚¢‚éB
Œ¤‹†ŽÒFChung-Yi Li et al: ‘ä˜p‚ÌŒ¤‹†ŽÒ
ŒfÚŽGBio Electromagnetics 24:218-221, 2003.

To explore whether the age at cancer diagnosis was associated with residential exposure to magnetic field, we compared average ages at diagnosis for cases of leukemia, brain tumor, or female breast cancer with elevated exposure (magnetic flux density > 0.2 uT, or residential distance from major power lines < 100 m) to average ages at diagnosis for cancer cases with same diagnoses but with a background exposure (< 0.2 uT or > 100 m from major power lines).
 
Šà‚Ɛf’f‚³‚ꂽ”N—ZŠÂ‹«‰º‚É‚¨‚¯‚鎥ŠE–\˜I‚ÉŠÖŒW‚µ‚Ä‚¢‚é‚©’²¸‚ðs‚Á‚½B‘Ώۂ͔’ŒŒ•aA”]ŽîᇁA—«“û‚ª‚ñ‚Å‚ ‚éB0.2ƒÊTˆÈã‚̍‚”˜˜I‚à‚µ‚­‚ÍŽå—v‚È‘—“dü‚Ì‚P‚O‚O‚ˆÈ“à‚ɏZ‚ñ‚Å‚¢‚él‚ªŠà‚Ɛf’f‚³‚ꂽ”N—î‚Ì•½‹Ï’l‚ƁA0.2ƒÊTˆÈ‰º‚Ì”wŒi”˜˜I‚à‚µ‚­‚Í‘—“dü‚©‚ç‚P‚O‚O‚ˆÈã—£‚ê‚Ä‚¢‚éê‡‚Æ‚ð”äŠr‚µ‚½B

Comparing with brain tumor cases with background magnetic field exposure (n = 506), brain tumor cases with elevated exposure (n = 71) were 6 years older on average at diagnosis (P = 0.01).

”]ŽîᇂɊւµ‚ẮAŽ¥ŠE‚̍‚”˜˜Ii0.2ƒÊTˆÈãj‚̏Ǘá‚Í71–¼A”wŒi”˜˜Ii0.2ƒÊTˆÈ‰ºjŒQ‚Å‚Í506–¼‚ð”äŠr‚µA‚”˜˜IŒQ‚Å‚Í6Î”N—‚‚©‚Á‚½B“Œv“I‚É—LˆÓ‚Å‚ ‚Á‚½B

The difference was greater for males (45.2 vs. 52.
‚P years, P = 0.01) than for females (44.3 vs. 48.2 years, P = 0.27).

‚±‚̍·‚́A’j«‚Å‚Í‚æ‚è‹­‚¢ŒXŒü‚É‚ ‚èA‚”˜˜IG52.1ÎA”wŒi–\˜IF45.2Î‚Å“Œv“I‚É—LˆÓ‚Å‚ ‚Á‚½B—«‚ł͍‚”˜˜IF48.2Î@”wŒi”˜˜IF44.3Î‚Å‚ ‚Á‚½B@

No such phenomena at a significant level were observed for leukemia, female breast cancer, or a random sample of general population.
@
”’ŒŒ•aA—«“û‚ª‚ñA–³ìˆ×’Šo‚µ‚½ˆê”ʏZ–¯‚ł́A‚±‚¤‚µ‚½ŠÖ˜A‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

We noted an association between magnetic field exposure and a greater mean age at diagnosis for brain tumors.
@
”]ŽîᇂɊւµ‚ẮAŽ¥ŠE–\˜I‚Æ”]ŽîᇂɂȂéif’f‚³‚ê‚éjŽžŠú‚Ì•½‹Ï”N—î‚Æ‚ÉŠÖ˜A‚ª‚ ‚Á‚½B

Whether or not these phenomena suggest delayed occurrence of brain tumors following a higher than background residential magnetic field exposure deserves further investigation.
‚Ž¥ŠE”˜˜I‚ª”wŒi”˜˜Ii0.2ƒÊTˆÈ‰ºj‚É”ä‚ׂĔ]Žîᇂ̔­¶‚ð’x‚点‚éŒø‰Ê‚ª‚ ‚é‚©”Û‚©‚ÉŠÖ‚µ‚Ä‚Í‚³‚ç‚Ȃ錤‹†‚ª•K—v‚Å‚ ‚éB@

 

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‚S‚UD‚P‚UD‚V‚g‚šŽ¥ŠE‚Ə¬Ž™”’ŒŒ•a


ƒAƒuƒXƒgƒ‰ƒNƒg‚Ì‚Ý“üŽè@‰¼–ó‚ð‚‚¯‚½B@ì¬G‚Q‚O‚O‚R|‚W|‚W@

ŒfÚŽGBritish Journal of Cancer: March 2001, Volume 84, Number 5, Pages 697-699

˜_•¶–¼FChildhood acute leukemia and residential 16.7 Hz magnetic fields in Germany
 
ƒhƒCƒc‚É‚¨‚¯‚éZŠÂ‹«‰º‚Ì‚P‚UD‚V‚g‚šŽ¥ŠE–\˜I‚Ə¬Ž™‹}«”’ŒŒ•a
Œ¤‹†ŽÒFJ Schüz, J P Grigat, K Brinkmann and J Michaelis@
Institut für Medizinische Statistik und Dokumentation der Universität Mainz, D-55101 Mainz, Germany

Abstract
@ŠT—v@
We observed a moderate but statistically non-significant association between magnetic fields (MF) and childhood leukemia.
Ž¥ŠE–\˜I‚Ə¬Ž™”’ŒŒ•a‚Ƃ̂킸‚©‚ȁA‚µ‚©‚µ“Œv“I‚É‚Í—LˆÓ‚Å‚Í‚È‚¢ŠÖŒW‚ðŒ©o‚µ‚½B

This is the first such study to cover residential exposure to 16.7 Hz (railway frequency) MF though based on few exposed subjects.
‚±‚ê‚́A“d‹C“S“¹‚ō̗p‚³‚ê‚Ä‚¢‚é‚P‚UD‚V‚g‚š‚ÌŽ¥ŠE‚ÉŠÖ‚·‚éÅ‰‚ÌŒ¤‹†‚ŁAZŠÂ‹«‰º‚Å‚Ì–\˜I‚ðŽó‚¯‚Ä‚¢‚鑽‚­‚È‚¢(Œ´•¶‚Ífew‚Å‚ ‚èAa few‚Å‚Í‚È‚¢HH)@lX‚ð‘ΏۂƂµ‚½B

Our study does not exclude a small excess risk, but the attributable risk must be very low.
–{Œ¤‹†Œ‹‰Ê‚͏­‚È‚¢‰ßèƒŠƒXƒN‚ª‚ ‚邱‚Æ‚ð”rœ‚µ‚È‚¢‚ªAƒŠƒXƒN‚ª‚ ‚Á‚½‚Æ‚µ‚Ä‚àŠñ—^—¦‚Í’á‚¢B

It is reassuring that neglecting 16.7 Hz MF in childhood cancer studies appears to have little effect on findings.
Ž¥ŠE‚Ə¬Ž™‚ª‚ñ‚ÉŠÖ‚·‚錤‹†‚ɍۂµ‚āA‚±‚Ì‚P‚UD‚V‚g‚šŽ¥ŠE‚𖳎‹‚µ‚Ä‚àAŒ¤‹†‚ɉe‹¿‚ð—^‚¦‚È‚¢‚±‚Æ‚ª‚í‚©‚Á‚½B

 

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‚S‚V@ƒXƒEƒF[ƒfƒ““d—ÍŽ–‹Æ]Ž–ŽÒ‚̃Rƒz[ƒgŒ¤‹†Œ‹‰Ê

 

ƒXƒEƒF[ƒfƒ“‚Ì’·Šú“I’²¸‚Å–¾‚ç‚©‚É
o“TFEuropean Commission”­suJANUSv‘æ27† p.24

ELECTROMAGNETIC FIELDS DO NOT INCREASE THE RISK OF ILL-HEALTH
“dŽ¥ŠE‚É‚ÍŒ’N‚ւ̊댯‚Í‚È‚¢

Every Seventh worker at electrical power companies has experienced that her or his health has worsened. Noise at work was the main problem.
Linemen suffered very often from backache and knee pain.
There was no correlation between exposure for magnetic fields and health effects. Furthermore, the study showed that the fields did not increase reproductive hazards or the risk of a malformed foetus.
@“d—͉ïŽÐ‚̏]Ž–ŽÒ‚Ì7l‚É1l‚ÍŒ’N‚̈«‰»‚ðŒoŒ±‚µ‚Ä‚¢‚éB‚»‚ÌŒ´ˆö‚ÍŽå‚ɐEê‚Å‚Ì‘›‰¹‚É‚ ‚éB‚Ü‚½‰ËüH‚à˜’É‚â•G‚̒ɂ݂ɋꂵ‚Þ‚±‚Æ‚ª‘½‚¢B
‚µ‚©‚µAŽ¥ŠE‚É‚³‚炳‚ê‚邱‚Æ‚ÆŒ’N‚ւ̉e‹¿‚Ƃ̊Ԃɂ́A‘ŠŠÖ‚ª‚È‚¢‚±‚Æ‚ª’²¸‚Å•ª‚©‚Á‚½B‚Ü‚½Ž¥ŠE‚͐¶B‹@”\‚ɏáŠQ‚ð—^‚¦‚½‚èA‘ÙŽ™‚ÉŠïŒ`‚ð‹N‚±‚µ‚½‚è‚·‚郊ƒXƒN‚à‚È‚¢‚±‚Æ‚ª”»–¾‚µ‚½B

A unique research project within the Swedish electrical power industry, has been carried out at the Swedish Institute for Work Life Research in Stockholm.
The researchers have made a prospective study.
A selected group of employees, a so-called cohort, was examined for a long period of time.
ƒXƒEƒF[ƒfƒ““d—ÍŽY‹Æ‚цƒj[ƒN‚ÈŒ¤‹†ƒvƒƒWƒFƒNƒg‚ªAƒXƒgƒbƒNƒzƒ‹ƒ€‚̃XƒEƒF[ƒfƒ“˜J“­¶ŠˆŒ¤‹†Š‚É‚æ‚Á‚čs‚í‚ꂽBŒ¤‹†ŽÒ‚́A‘OŒü‚«‚ÌŒ¤‹†i‚ ‚鎞“_‚©‚çŠJŽn‚µ‚āA’ǐՒ²¸‚ðs‚¤j‚ðs‚Á‚½B‘I‘ð‚³‚ê‚½]‹ÆˆõƒOƒ‹[ƒv‚ªƒRƒz[ƒg‚Æ‚µ‚āA’·Šú‚É“n‚è’²¸‚³‚ꂽB

About 700 workers at power stations and linemen, recruited by companies during 1981-85, were included in the research project.
A medical investigation was carried out every third year.
At the same intervals the employees' experiences were investigated by a specific questionnaire, in which the workers judged and evaluated their working conditions.
1981
”N‚©‚ç85”N‚É‚©‚¯‚ĉïŽÐ‚É‚æ‚Á‚Čٗp‚³‚ꂽA”­“dŠ‚̏]‹Æˆõ‚â‰ËüH‚ðŠÜ‚Þ700l‚̘J“­ŽÒ‚ª’²¸‚̑ΏۂɂȂÁ‚½B‚R”N’u‚«‚ÉŒ’Nf’f‚ªs‚í‚êA‚»‚ê‚Æ“¯Žž‚ɏ]‹Æˆõ‚ªŒoŒ±‚µ‚½‚±‚Ƃɂ‚¢‚ẴAƒ“ƒP[ƒg’²¸‚às‚í‚ꂽB

The exposure is different risk Factors such as certain chemical, noise
and electric and magnetic fields was measured by technical expert.
When the project ended in 1995 about 460 workers were still in the study group.
ŠeŽí‚̃ŠƒXƒN—vˆöA‚½‚Æ‚¦‚Ή»ŠwÞ—¿A‘›‰¹A“dŽ¥ŠE‚È‚Ç‚ªA‹Zp‚̐ê–å‰Æ‚É‚æ‚Á‚Ä‘ª’肳‚ꂽBƒvƒƒWƒFƒNƒg‚Í1995”N‚ɏI‚í‚Á‚½‚ªA‚»‚ÌŽž‚É‚Í–ñ460l‚̘J“­ŽÒ‚ª’²¸ƒOƒ‹[ƒv‚ÉŽc‚Á‚Ä‚¢‚½B

Early warning
@‰Šú‚ÌŒx
For quite a long time electric and magnetic Fields have been in the focus of the risk debate, not least in the media.
The First findings were reported in the 1970s by Spanish and Russian scientists.
“dŽ¥ŠE‚ªŒ’N‚Ɋ댯‚ð‹y‚Ú‚·‚©‚Ç‚¤‚©‚Ì–â‘è‚́A’·‚¢ŠÔA“Á‚ɃƒfƒBƒA‚݂̂ȂȂ炸A˜_‹c‚̃^ƒl‚É‚È‚Á‚Ä‚¢‚½BÅ‰‚ÌŒ¤‹†¬‰Ê‚Í1970”N‘ã‚ɃXƒyƒCƒ“‚¨‚æ‚уƒVƒA‚̉ȊwŽÒ‚É‚æ‚Á‚Ä”­•\‚³‚ꂽB

Therefore, the Swedish researchers studied whether this exposure could be related to specific symptoms, such as anxiety, depression, dizziness, headaches, irritation, numbness, stomach pains, restlessness, sleeplessness and tiredness.
‚»‚Ì‚½‚߁AƒXƒEƒF[ƒfƒ“‚ÌŒ¤‹†ŽÒ‚Í‚±‚¤‚µ‚½”˜˜I‚ª“Á’è‚̏ǏóA‚½‚Æ‚¦‚ΕsˆÀA—}ŸTÇA‚ß‚Ü‚¢A“ª’ɁA‚¢‚炾‚¿AŒ‘‘ÓŠ´AˆÝ’ɁA•s–°ÇA”æ˜J‚È‚Ç‚ÆŠÖŒW‚ª‚ ‚é‚©‚Ç‚¤‚©‚𒲍¸‚µ‚½B

The scientists did not find any correlation between electric fields and depression, headaches or sleeplessness, however magnetic fields may increase the risk of anxiety, restlessness and tiredness.
‚±‚Ì’²¸‚É‚æ‚é‚ƁA“dŠE‚Æ—}ŸTÇA“ª’ɁA•s–°Ç‚Ƃ̊Ԃɂ͉½‚ÌŠÖŒW‚à‚È‚¢‚±‚Æ‚ª‚í‚©‚Á‚½B‚µ‚©‚µAŽ¥ê‚Í•sˆÀA•sˆÀ’èA”æ˜J‚̃ŠƒXƒN‚ð‚‚ß‚é‰Â”\«‚ª‚ ‚é‚Æ‚³‚ê‚Ä‚¢‚éB

Since it is important to detect early symptoms, the worker's blood and hormones, such as cortisole and prolactine, and biomarkers, such as tissue polypeptid antigen (TPA), were analysed.

This antigen may be very useful in the detection of early tumors.
Çó‚𑁊ú‚É”­Œ©‚·‚邱‚Æ‚ªd—v‚Å‚ ‚邽‚߁A˜J“­ŽÒ‚ÌŒŒ‰t‚¨‚æ‚уzƒ‹ƒ‚ƒ“iƒRƒ‹ƒ`ƒ][ƒ‹‚âƒvƒƒ‰ƒNƒ`ƒ“–‚ȂǁjA¶•¨Žw•Wi‘gD‚̃|ƒŠƒyƒvƒ`ƒhRŒ´TPA‚Ȃǁj‚ª•ªÍ‚³‚ꂽB‚±‚̍RŒ´‚ÍŽîᇂ𑁊ú‚É”­Œ©‚·‚éã‚Å—LŒø‚Å‚ ‚éB

The researchers did notice that electrical fields might increase the body's production of cortisole and TPA.
However, the results have to be interpreted very cautiously. Furthermore,
the researchers did not find any correlation between exposure to the fields and reproductive hazards.
’²¸‚ł́A“dŠE‚ª‘Ì“à‚̃Rƒ‹ƒ`ƒ][ƒ‹‚âTPA‚̐¶ŽY‚𑝂₷‰Â”\«‚ðŽw“E‚µ‚Ä‚¢‚½B‚±‚¤‚µ‚½Œ‹‰Ê‚͐Td‚ɉðŽß‚·‚é•K—v‚ª‚ ‚éB‚³‚ç‚É“dŽ¥ŠE”˜˜I‚Ɛ¶B‹@”\‚̏áŠQ‚Æ‚ÌŠÖ˜A‚ÍŒ©o‚¹‚È‚©‚Á‚½B

Noise a problem
@‘›‰¹‚ª–â‘è‚É
The linemen had hard, heavy work tasks and they were exposed to wind and bad weather conditions. After nine years in this occupation every seventh employee suffered from back pain.
Furthermore, every eighth worker fell symptoms in the knees, the neck or the shoulders.
‰ËüH‚ÌŽdŽ–‚͏d˜J“­‚ŁA•—‚∫“VŒó‚Ì’†‚Å‚àì‹Æ‚µ‚È‚¯‚ê‚΂Ȃç‚È‚¢B‚±‚Ì‹Æ–±‚É‚X”N‚ɂ킽‚Á‚ď]Ž–‚µ‚½ê‡A˜J“­ŽÒ‚Ì7l‚É‚Pl‚͍˜’ɂɋꂵ‚ß‚ç‚ê‚éB‚³‚ç‚É8l‚É1l‚Í•GAŽñAŒ¨‚ȂǂɏǏ󂪌©Žó‚¯‚ç‚ꂽB

In general, the most frequently reported symptoms of the whole study group were bock pain, headaches, stomach problems and shoulder pain.
‘S‘Ì‚Æ‚µ‚āA’²¸‘ΏۃOƒ‹[ƒv‚ÅÅ‚à‘½‚¢Çó‚͍˜’ɁA“ª’ɁAˆÝ•aAŒ¨’É‚È‚Ç‚Å‚ ‚Á‚½B

The employees themselves pointed out that noise was the main problem in their work environment. In an everyday context, the noise levels exceeded the Swedish threshold value.
˜J“­ŽÒŽ©g‚ª˜J“­ðŒ‚Ì’†‚ōłà–â‘è‚È‚Ì‚Í‘›‰¹‚¾‚ÆŽw“E‚µ‚Ä‚¢‚½B–ˆ“ú‚̍ì‹Æ‚Ì’†‚Å‘›‰¹ƒŒƒxƒ‹‚̓XƒEƒF[ƒfƒ“‚Ì臒l‚ð’´‚¦‚Ä‚¢‚½B

The most frequent sources were compressors, drilling machines, excavators, power saws and snow scooters. To reduce the noise level the researcher suggested an action programme.
‘›‰¹‚ÌŒ´ˆö‚̓Rƒ“ƒvƒŒƒbƒTAúE‹@AŒ@í‹@A“d“®‹˜AáãŽÔ‚È‚Ç‚Å‚ ‚Á‚½B‘›‰¹ƒŒƒxƒ‹‚ðˆø‚«‰º‚°‚邽‚߂ɂ́A‚»‚Ì‚½‚߂̑΍ôƒvƒƒOƒ‰ƒ€‚ª•K—v‚Å‚ ‚é‚ÆŒ¤‹†ŽÒ‚ÍŽw“E‚µ‚Ä‚¢‚éB

In general, the health and well-being of the employees was quite good during the project. Workers in the power industry did not suffer from diseases or injuries more than other occupational groups.
Furthermore, we did not find any symptoms which could be explained by the e electric and magnetic fields' concluded Siv Torqvist a researcher on the project.
u‚±‚Ì’²¸ƒvƒƒWƒFƒNƒg‚ÌŠúŠÔ’†‚É‚¨‚¯‚é˜J“­ŽÒ‚ÌŒ’NA•ŸŽƒ‚Í”ñí‚ɗǍD‚¾‚Á‚½B“d—ÍŽY‹Æ‚̘J“­ŽÒ‚Í‘¼‚̐EŽí‚̘J“­ŽÒ‚æ‚è•a‹C‚âÐŠQ‚ª‘½‚¢‚Æ‚¢‚¤‚悤‚È•sˆÀ‚Í‚à‚Á‚Ä‚¢‚È‚©‚Á‚½B‚³‚ç‚É“dŽ¥ŠE‚É‹Nˆö‚·‚éÇó‚ÍŒ©o‚¹‚È‚©‚Á‚½v‚ƁAƒvƒƒWƒFƒNƒg‚ÌŒ¤‹†ˆõ‚̃VƒuEƒgƒ‹ƒ“ƒLƒXƒg‚ÍŒê‚Á‚Ä‚¢‚éB


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‚S‚W@ƒXƒEƒF[ƒfƒ““d—ÍŽ–‹Æ]Ž–ŽÒ‚̐¶B‚ւ̉e‹¿\‚P‚X‚X‚W”N

 

ŠT—v‚ð“üŽè@‰¼–ó‚ð‚‚¯‚½B@ì¬F‚Q‚O‚O‚R|‚P‚P|‚Q‚R@

Œ¤‹†ŽÒFSiv Tornqvist, RN
˜_•¶–¼FPaternal Work in the Power Industry: Effects on Children at Delivery
@@@@•ƒe‚ª“d—͏]Ž–ŽÒê‡F¶‚Ü‚ê‚éŽq‹Ÿ‚ւ̉e‹¿@
ŒfÚŽGŽFJOEM(Journal of Occupational and Environmental Medicine) 40:2 (February 1998), pp 111-117@

Although reports on reproductive disturbances among occupational groups of electrical workers have been discussed, few studies have focused explicitly on the children of workers employed in the power industry.
E‹Æ“I‚È“d‹CŠÖŒW]Ž–ŽÒ‚Ì’†‚É‘¶Ý‚·‚鐶BáŠQ‚ÉŠÖ‚·‚é•ñ‚ª‚ ‚éB’†‚É‚Í“d—ÍŽ–‹Æ]Ž–ŽÒ‚ÌŽq‹Ÿ‚É“Á‚ɏœ_‚ð“–‚Ä‚½Œ¤‹†‚ª‚ ‚éBiŒ´•¶‚ÍFew‚Å‚ ‚邪AA few‚̊ԈႢHj

Birth outcome and cancer in the offspring(
Žq‹Ÿ) of fathers who were exposed to electric and magnetic fields at time of spermi¸Žqjproduction were studied in two cohorts.
¸Žq‚ªì‚ç‚ê‚鎞‚É“dŽ¥ŠE‚É”˜˜I‚µ‚½•ƒe‚ÌŽq‹Ÿ‚ÌŠà‚Əo¶‚ÉŠÖ‚·‚é“ñ‚‚̃Rƒz[ƒgŒ¤‹†‚ª‚ ‚éB

In Study I, male occupation in the power industry was identified in censuses. Study 2 is a prospective cohort study of newly employed power industry workers.
Œ¤‹†‚P‚ł͍‘¨’²¸‚ð—˜—p‚µ‚½’j«“d—͏]Ž–ŽÒ‚ð‘ΏۂƂµAŒ¤‹†2‚Å‚Í“d—ÍŽ–‹Æ‚ɐV‹K‚ɍ̗p‚³‚ꂽl‚ð‘ΏۂƂµ‚½‘OŒü‚«‚̃Rƒz[ƒgŒ¤‹†‚Å‚ ‚éB@

Birth data were obtained by record linkage between censuses and several available
@health registers in Sweden.
o¶ƒf[ƒ^‚̓XƒEƒF[ƒfƒ“‚̍‘¨’²¸‚ÆŠô‘½‚Ì—˜—p‰Â”\‚ÈŒ’N“o˜^‚ðŒ‹‚Ñ‚Â‚¯‚āA“¾‚ç‚ꂽB

Multiple births, birth weight, sex survival, congenital malformations, and cancer have been analyzed with relation to the father's exposure to electric and magnetic fields one year before the child was born.
‘oŽq‚Ì’a¶A¶‚܂ꂽŽž‚̑̏dA«•ÊAæ“V“I‚ȈُíAŠà‚ðAŽq‹Ÿ‚ª¶‚Ü‚ê‚é1”N‘O‚Ì•ƒe‚Ì“dŽ¥ŠE”˜˜I‚Æ‚ÌŠÖŒW‚ŁA‰ðÍ‚µ‚½A

There were six cancer cases among infants(1
Î–¢–ž‚Ì—cŽ™) in the exposed group (2.4 expected) and six in the unexposed group (3.2 expected) in Study 1.
Œ¤‹†‚P‚ł́A”˜˜IŒQ‚Å‚ÍŠú‘Ò’l2.4‚ɑ΂µ‚Ä1Î–¢–ž‚Ì—cŽ™‚ÌŠà‚ª6—áA”ñ”˜˜IŒQ‚Å‚ÍŠú‘Ò’l3.2‚ɑ΂µ‚Ä6—á‚ÌŠà‚ªŠÏŽ@‚³‚ꂽB@

Jointly, the 12 cancer cases found among the infants were more than expected (P = 0.02). However, this total excess may be random.
‚ ‚킹‚Ä12—á‚Ì1Î–¢–ž‚Ì—cŽ™‚ÌŠà‚ÍŠú‘Ò’l‚ðã‰ñ‚鐔Žš‚Å‚ ‚邪A‚±‚ê‚Í‹ô‘R‚ÆŒ¾‚¦‚éB

No cancer cases were observed in the prospective study.
Œ¤‹†2‚Ì‘OŒü‚«ƒRƒz[ƒgŒ¤‹†‚ł́AŠà‚̏Ǘá‚ÍŠÏŽ@‚³‚ê‚È‚©‚Á‚½B

For chromosomal abnormalities, such as Down's syndrome, one case was observed among infants of exposed fathers and three cases, among unexposed fathers in Study 1.
ƒ_ƒEƒ“ÇŒóŒQ‚̂悤‚ȐõF‘ُ̈í‚ÉŠÖ‚µ‚ẮAŒ¤‹†‚P‚ŁA”˜˜IŒQ‚Å‚Í1—áA”ñ”˜˜IŒQ‚Å‚Í3—ႪŠÏŽ@‚³‚ꂽB

In Study 2, no cases were observed.
Œ¤‹†‚Q‚ł́A‚»‚¤‚µ‚½Ç—á‚ÍŠÏŽ@‚³‚ê‚È‚©‚Á‚½B

There was a slightly higher proportion of malformation diagnoses among infants of exposed fathers than among infants of unexposed fathers in Study 2, but this could be random (odds ratio = 1.59; 95% Confidence interval 0.43-1.48).
Œ¤‹†2‚ł́A”ñ”˜˜IŒQ‚ɑ΂µ‚Ä”˜˜IŒQ‚łُ̈í‚ÌŠ„‡‚ª­‚µ‚‚©‚Á‚½‚ªA‚±‚ê‚Í‹ô‘R‚ÆŒ¾‚¦‚éBƒIƒbƒY”ä‚Í1.59@95%M—Š‹æŠÔ‚Í0.43|1.49‚Å‚ ‚Á‚½B@

No clear-cut effects on infants fathered by men who were exposed to electric and magnetic fields around the time of sperm production could be seen in these two studies.
‚±‚ê‚ç‚Ì“ñ‚‚̌¤‹†‚©‚çA“dŽ¥ŠE‚É”˜˜I‚µ‚½•ƒe‚ÌŽq‹Ÿ‚Ö‚Ì–¾Šm‚ȉe‹¿‚ÍŒ©‚ç‚ê‚È‚©‚Á‚½B

Correspondence:
@Siv Tornqvist, RN
National Institute for Working Life S-17184 Solna, Sweden

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49. “d—ÍŽü”g”“dŽ¥ŠE–\˜I‚Ɛ_ŒoŽ¾Š³‚Ì‘ä˜p‚ł̉uŠwŒ¤‹†


ŠT—v‚ð“üŽè@‰¼–ó‚ð‚‚¯‚½B@ì¬F@‚Q‚O‚O‚R|‚P‚P|‚Q‚T@

˜_•¶–¼FRisk of Cognitivei”F’mjImpairmenti‹@”\‚È‚Ç‚ðŠQ‚·‚éj in Relation to Elevated Exposure to Electromagnetic Fields@“dŽ¥ŠE”˜˜I‚É‚æ‚é”F’máŠQ‚̃ŠƒXƒN
ŒfÚŽFJOEMiJournal of occupational and Environmental Medicinej44:1 pp 66-72 JANUARY 2002
Œ¤‹†ŽÒFChung-Yi, Li, PhD, Fung-Chang Sung, PhD, Shwu Chong Wu,PhD

ŠT—v
Occupational exposure to power-frequency electromagnetic fields (PF-EMF) has been suspected of being associated with adverse neurological outcomes.
E‹Æ“I‚È“d—ÍŽü”g”“dŽ¥ŠE–\˜I‚ª_Œo‹@”\‚Ɉ«‰e‹¿‚ð‹y‚Ú‚µ‚Ä‚¢‚é‰Â”\«‚ª‚ ‚éB

We performed a case-control study to assess the relationship between exposure to PF-EMF and the risk of cognitive impairment, an indication of certain adverse neurological diseases such as Alzheimer's disease and dementia
i’s•ðj.
“d—ÍŽü”g”“dŽ¥ŠE–\˜I‚Ɛ_ŒoáŠQ‚̃ŠƒXƒN‚ÌŠÖŒW‚𒲍¸‚·‚邽‚߂ɏǗá‘Ώƌ¤‹†‚ðs‚Á‚½B”F’máŠQ‚̈«‰e‹¿‚ÌŽw•W‚Æ‚µ‚ăAƒ‹ƒcƒnƒCƒ}[•a‚Æ’s•ð‚ðŽæ‚èã‚°‚½B

Among 2198 elderly individuals aged 65 years or older, 290 persons with score-based cognitive impairment were compared with 580 sex-matched controls to assess the risk of cognitive impairment in relation to PF-EMF exposure.
‚U‚TÎˆÈã‚Ì”N—î‚Ì‚Q‚P‚X‚W–¼‚̌l‚ð‘ΏۂɁA”F’máŠQ‚Æ”»’肳‚ꂽ‚Q‚X‚O–¼‚ƁA‚T‚W‚O–¼‚̑ΏƂð“d—ÍŽü”g”“dŽ¥ŠE–\˜I‚Æ‚ÌŠÖŒW‚ð”äŠr‚µ‚½B

Participants who were former electrical workers or living within 100 meters of high-voltage transmission lines were considered to have higher exposure.
’²¸‚̑Ώێ҂͓dŽ¥ŠE‚ɍ‚”˜˜I‚ƍl‚¦‚ç‚ê‚錳“d—ÍŽ–‹Æ]Ž–ŽÒ‚©A‚ˆ³‘—“dü‚©‚ç‚P‚O‚O‚ˆÈ“à‚ɏZ‚ސl‚Å‚ ‚éB

Compared with background exposure, the risk was equal or close to unity for participants with higher exposure from a previous occupation (odds ratio [OR], 1.3; 95% confidence interval [CI], 0.7 to 2.3), higher residential exposure (OR, 0.9; 95% CI, 0.3 to 2.6), or higher exposure in both occupation and residential environments (OR, 1.0; 95% CI, 0.2 to 4.6).
”wŒi”˜˜I‚Æ”ä‚ׂāAƒŠƒXƒN‚Í•½‹Ï“I‚È’l‚Æ“¯‚¶‚©‚»‚ê‚É‹ß‚¢’l‚Å‚ ‚Á‚½B‰ß‹Ž‚̐E‹Æ“I‚ȍ‚”˜˜I‚ł̓IƒbƒY”ä‚Í1.3i95%“M—Š‹æŠÔ‚Í0.7-2.3jAZŠÂ‹«‚ł̍‚”˜˜I‚ł̓IƒbƒY”ä‚Í0.9A@ZŠÂ‹«‚ƉߋŽ‚̐E‹Æ“I‚È”˜˜I‚ł̃IƒbƒY”ä‚Í1.0‚Å‚ ‚Á‚½B

Our findings provide little support for the link between PF-EMF and cognitive impairment. Nevertheless, the study results do not preclude the possible association between PF-EMF and any specific neurodegenerative (_ŒoÁ–Ր«Ž¾Š³) disease previously investigated.
‚±‚ÌŒ¤‹†Œ‹‰Ê‚́A“d—ÍŽü”g”“dŽ¥ŠE‚Æ”F’máŠQ‚ÌŠÖŒW‚ðŽxŽ‚µ‚È‚¢B
‚µ‚©‚µA‰ß‹Ž‚ɍs‚í‚ꂽ‘¼‚Ì“dŽ¥ŠE‚Ɛ_ŒoÁ–Ր«Ž¾Š³‚ÌŠÖŒW‚ðŽ¦´‚·‚錤‹†‚ð”Û’è‚·‚é‚à‚Ì‚Å‚à‚È‚¢B


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