Abstract
To test the hypothesis that exposure to magnetic fields, of the type generated by high voltage installations, increases cancer incidence in children, the original data from two case-control studies were pooled. The Swedish study was based on children living within 300 m from transmission lines, and the Danish study on the total population of Denmark. In both these studies, national cancer registries were used to identify cases of leukaemia, lymphoma or central nervous system tumour. Controls were selected randomly from the study populations. Magnetic field exposure was assessed through theoretical calculations of the magnetic fields before the time of diagnosis. An elevated relative risk of childhood leukaemia was found for calculated magnetic field levels of > or = 0.2 microT, estimated at 2.0 (95% CI 1.0-4.1), and for magnetic field levels of > or = 0.5 microT, estimated at 5.1 (95% CI 2.1-12.6). The results support the hypothesis of an association between magnetic fields and childhood leukaemia.
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