Re: Kheifets et al. (2017): Residential magnetic fields exposure and childhood leukemia: a population-based case–control study in California
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In a case–control study of childhood leukemia and residential magnetic fields (MF) in California, Kheifets and colleagues recently reported a weak non-significant association from an exposure evaluation that only included high-voltage transmission lines (HVTL) . However, our 1999 paper  reported a significant association in a study of Los Angeles County, California’s largest metropolitan area, with similar methods applied to all types of electric lines near a subject’s residence. By comparing these two studies, the relative merits of the MF exposure assessment methods and risk estimates can be assessed, providing lessons for future epidemiologic studies of residential MF carcinogenicity.
Kheifets et al. obtained 5,788 cases of childhood leukemia and an equal number of controls from the California Cancer Registry. They conducted a detailed MF exposure assessment for the 302 subject’s residences that were close to an HVTL, and treated all other residences as having background MFs [
Funding was provided by Electric Power Research Institute (Grant No. 2964) and National Institute of Environmental Health Sciences (Grant No. P30 ES 07048-11).
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