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American Journal of Epidemiology Vol. 155, No. 4 : 368-378
Copyright © 2002 by The Johns Hopkins University School of Hygiene and Public Health

ORIGINAL CONTRIBUTIONS

Individual Estimation of Exposures to Extremely Low Frequency Magnetic Fields in Jobs Commonly Held by Women

J. E. Deadman and C. Infante-Rivard

From the Joint Departments of Epidemiology, Biostatistics, and Occupational Health, Faculty of Medicine, McGill University, Montréal, Québec, Canada.

Exposures to extremely low frequency (ELF) magnetic fields have not been documented extensively in occupations besides the work environments of electric or telephone utilities. A 1980–1993 study of childhood acute lymphoblastic leukemia (ALL) in Québec, Canada, gathered detailed information about the occupations of 491 mothers of ALL cases and mothers of a similar number of healthy controls. This information was combined with published data on the intensities of ELF magnetic fields associated with sources or work environments to estimate ELF magnetic field exposures for a wide range of jobs commonly held by women. Estimated exposures for 61 job categories ranged from 0.03 to 0.68 µT; the 25th, 50th, and 75th percentiles were 0.135, 0.17, and 0.23 µT, respectively. By job category, the most highly exposed jobs (>0.23 µT) included bakery worker, cashier, cook and kitchen worker, electronics worker, residential and industrial sewing machine operator, and textile machine operator. By work environment, the most highly exposed job categories were electronics worker in an assembly plant (0.70 µT) and sewing machine operators in a textile factory (0.68 µT) and shoe factory (0.66 µT). These results provide new information on expected levels of exposure in a wide range of jobs commonly held by women.

electromagnetic fields; occupational exposure; women

Abbreviations: ALL, acute lymphoblastic leukemia; ELF, extremely low frequency; EMF RAPID, Electric and Magnetic Fields Research and Public Information Dissemination


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