Multiplicative interaction tests between mobile phone exposure and blood lead in association with ADHD symptoms were significant or borderline significant for the variables of ownership, age at first ownership of a mobile phone, and the number of outgoing calls per day, and the risk of ADHD symptoms was higher in the high lead group than that in the low lead group.
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Mobile phone use, blood lead levels, and attention deficit hyperactivity symptoms in children: a longitudinal study.
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