Estimating magnetic fields of homes near transmission lines in the California Power Line Study

摘要: The California Power Line Study is a case-control study investigating the relation between residences near transmission lines and risk of childhood leukemia. It includes 5788 leukemia cases matched primary controls born 1986 2007. We describe methodology for estimating magnetic fields at as well characterizing sources uncertainty in these estimates. Birth subjects were geocoded their distances to ascertained. 302 deemed sufficiently close have non-zero attributable lines. These visited detailed data, describing physical configuration dimensions contributing field residence, collected. Phasing, loading, directional load flow data years birth diagnosis each subject day site visit obtained from utilities when available; yearly average particular year was not available, extrapolated values based on expert knowledge prediction models obtained. used estimate center, closest farthest point residence. found good correlation calculated spot measurements taken during visits. Our modeling strategies yielded similar estimates, they high agreement with utility extrapolations. Phasing known over 90% Important included lack information precise location located within apartment buildings or other complexes. findings suggest that we able achieve specificity exposure assessment, which essential examining association distance power risk.