TY - JOUR T1 - Leukaemia, brain tumours and exposure to extremely low frequency magnetic fields: cohort study of Swiss railway employees JF - Occupational and Environmental Medicine JO - Occup Environ Med SP - 553 LP - 559 DO - 10.1136/oem.2006.030270 VL - 64 IS - 8 AU - Martin Röösli AU - Manfred Lörtscher AU - Matthias Egger AU - Dominik Pfluger AU - Nadja Schreier AU - Emanuel Lörtscher AU - Peter Locher AU - Adrian Spoerri AU - Christoph Minder Y1 - 2007/08/01 UR - http://oem.bmj.com/content/64/8/553.abstract N2 - Aims: To 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. Methods: 20 141 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. Results: The 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. Conclusions: Some 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. ER -