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We assessed for comorbid developmental disorders and which cognitive processes were impaired in children with ADHD. Method: Measures of intelligence, language, motor skills, social cognition, and executive functions were administered to children with ADHD ( n = 53) and age\/sex-matched typical children. Results: Clinically significant deficits were 2 to 7 times as common in children with ADHD as in typical children, and the structure of ability differed in the two groups. Abilities were less differentiated in children with ADHD. 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