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Most children with attention-deficit/hyperactivity disorder (ADHD) have one or more coexisting conditions that affect learning and social relationships. To examine comorbidity in children with ADHD, researchers conducted a cross-sectional analysis of 61,779 children (age range, 6–17 years) from the 2007 National Survey of Children's Health. ADHD and other coexisting conditions were ascertained by asking parents if a doctor or healthcare provider had ever told them that their children had any of the conditions; 5028 children who currently had ADHD were included in the analysis.
The parent-reported prevalence of ADHD was 8.2%. Coexisting conditions were significantly more common in children with ADHD than in children without ADHD: learning dis…