Leukaemia, brain tumours and exposure to extremely low frequency magnetic fields: cohort study of Swiss railway employees |
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Authors: | Röösli Martin Lörtscher Manfred Egger Matthias Pfluger Dominik Schreier Nadja Lörtscher Emanuel Locher Peter Spoerri Adrian Minder Christoph |
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Affiliation: | Department of Social and Preventive Medicine, University of Berne, Switzerland. Roeoesli@ispm.unibe.ch |
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Abstract: | AimsTo investigate the relationship between extremely low frequency magnetic field (ELF‐MF) exposure and mortality from leukaemia and brain tumour in a cohort of Swiss railway workers.Methods20 141 Swiss railway employees with 464 129 person‐years of follow‐up between 1972 and 2002 were studied. Mortality rates for leukaemia and brain tumour of highly exposed train drivers (21 μT average annual exposure) were compared with medium and low exposed occupational groups (i.e. station masters with an average exposure of 1 μT). In addition, individual cumulative exposure was calculated from on‐site measurements and modelling of past exposures.ResultsThe hazard ratio (HR) for leukaemia mortality of train drivers was 1.43 (95% CI 0.74 to 2.77) compared with station masters. For myeloid leukaemia the HR of train drivers was 4.74 (95% CI 1.04 to 21.60) and for Hodgkin''s disease 3.29 (95% CI 0.69 to 15.63). Lymphoid leukaemia, non‐Hodgkin''s disease and brain tumour mortality were not associated with magnetic field exposure. Concordant results were obtained from analyses based on individual cumulative exposure.ConclusionsSome evidence of an exposure–response association was found for myeloid leukaemia and Hodgkin''s disease, but not for other haematopoietic and lymphatic malignancies and brain tumours. |
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Keywords: | leukaemia lymphoma brain tumours electromagnetic fields cohort study |
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