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With growing concern that environmental toxins might contribute to the increasing prevalence of attention-deficit/hyperactivity disorder (ADHD), interest has turned to the developmental neurotoxicity of mercury during gestation. Investigators prospectively studied a cohort of children born to mothers living near a contaminated Massachusetts harbor in the 1990s. At about age 8 years, 607 children had neuropsychological assessments; postpartum maternal hair mercury concentration and fish consumption during pregnancy were determined in 421 and 515 of their mothers, respectively. Median maternal hair mercury level was 0.45 µg/g, and median fish consumption was two servings per week.
In analysis adjusted for maternal, child, and household factors…