American Journal of Epidemiology Vol. 153, No. 9 : 825-835
Copyright © 2001 by The Johns Hopkins University School of Hygiene and Public Health
ORIGINAL CONTRIBUTIONS |
Leukemia, Brain Tumors, and Exposure to Extremely Low Frequency Electromagnetic Fields in Swiss Railway Employees
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. 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). The mortality rate ratio for leukemia was 2.4 (95% confidence interval (CI): 1.0, 6.1) among line engineers (reference category: station masters). 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). Two exposure characteristics were evaluated: cumulative exposure in µT-years and years spent under exposure to magnetic fields of 
10 µT. 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. The increase by years spent under exposure of 10 µT was even stronger: 62% per year (95% CI: 15, 129). Brain cancer risk did not show a dose-response relation. 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.
brain neoplasms; electromagnetic fields; environmental monitoring; leukemia; occupational exposure
Abbreviations: CI, confidence interval; ELF, extremely low frequency; ICD-8, International Classification of Diseases, Eighth Revision.
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