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Although children with attention-deficit hyperactivity disorder (ADHD) have, on average, lower intelligence quotient (IQ) scores than control subjects, the reasons for these deficits remain unknown. Because IQ is highly familial, we investigated whether children with ADHD have a decrement in IQ from expectations based on parental IQ.

An Examination of the Impact of Attention-Deficit Hyperactivity Disorder on IQ: A Large Controlled Family-Based Analysis