The results of studies of neurobehavioral responses to exposure to electric and magnetic fields are inconsistent and of mixed quality. The exposure measurements used—job titles, calculated fields, spot measurements and visual proximity—all have known limitations and are likely to result in substantial misclassification. A range of symptoms for clinically relevant outcomes were reported in the studies, and only some of the studies used standardized instruments to assess their occurrence. Hospital and medical records are likely to result in incomplete ascertainment and are likely biased by educational level and socioeconomic status of the subject.

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