Chunk #3 — Method — Subjects and Clinical Measures

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Investigating the contribution of common genetic variants to the risk and pathogenesis of ADHD.

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The children were between 4 and 18 years old (mean=10 years 3 months [SD=3 years]). The sample consisted of 699 boys (87.4%) and 100 girls (12.6%). Table 1 summarizes ADHD subtypes and comorbidities.