Abstract:
BACKGROUND:The risk of breast cancer was investigated in a large dynamic population-based cohort of all 1.1 million economically active women in Norway with potential exposure to 50 Hz magnetic fields at the censuses of 1960, 1970, and 1980. METHODS:The follow-up period for the cohort was 1961-1992. For each woman, date of birth and census information on occupation and socioeconomic status were ascertained. These data were linked to the breast cancer morbidity information in the Cancer Registry of Norway. Exposure to magnetic fields was assessed a priori using two different approaches. In the first approach, hours per week in a potential magnetic field above background level (0.1 microT) were classified by an expert panel. In the second approach, measured magnetic fields from a separate study of men at work were allocated to the women's census job titles. In both approaches, exposure was cumulated over the years of employment (work hours and microT-years, respectively). RESULTS:The Poisson regression analysis showed a risk ratio (RR) of 1.14 (95% confidence interval (CI) = 1.10-1.19) in the highest exposure category compared to the lowest when using the first approach, and the corresponding RR was 1.08 (95% CI = 1.01-1.16) when using the second approach. For women younger than 50 years, RR was 1.20 (95% CI = 1.11-1.29) and 1.12 (95% CI = 0.98-1.28), respectively. CONCLUSIONS:The results give some support to the hypothesis that exposure to 50 Hz magnetic fields may increase the risk of breast cancer. However, since no direct information on exposure was available, no firm conclusions can be drawn.
journal_name
Am J Ind Medjournal_title
American journal of industrial medicineauthors
Kliukiene J,Tynes T,Martinsen JI,Blaasaas KG,Andersen Adoi
10.1002/(sici)1097-0274(199907)36:1<147::aid-ajim2subject
Has Abstractpub_date
1999-07-01 00:00:00pages
147-54issue
1eissn
0271-3586issn
1097-0274pii
10.1002/(SICI)1097-0274(199907)36:1<147::AID-AJIM2journal_volume
36pub_type
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