Journal
BIOELECTROMAGNETICS
Volume 30, Issue 3, Pages 183-188Publisher
WILEY
DOI: 10.1002/bem.20465
Keywords
EMF; childhood cancer; epidemiology; exposure assessment
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A recent study examining the relationship between distance to nearby power lines and childhood cancer risk re-opened the debate about which exposure metrics are appropriate for power frequency magnetic field investigations. Using data from two large population-based UK and German studies we demonstrate that distance to power lines is a comparatively poor predictor of measured residential magnetic fields. Even at proximities of 50 m or less, the positive predictive value of having a household measurement over 0.2 mu T was only 19.4%. Clearly using distance from power lines, without taking account of other variables such as load, results in a poor proxy of residential magnetic field exposure. We conclude that Such high levels of exposure misclassification render the findings from Studies that rely on distance alone uninterpretable. Bioelectromagnetics 30:183-188, 2009. (c) 2008 Wiley-Liss, Inc.
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