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To examine comorbidity in children with attention deficit/hyperactivity disorder (ADHD), researchers used data from the 2007 National Survey of Children's Health to conduct a cross-sectional analysis of 61,779 children (age range, 6–17 years), including 5028 children (8%) with parent-reported diagnoses of ADHD.
Children with ADHD were significantly more likely than children without ADHD to have other neurodevelopmental conditions: learning disabilities (46% vs. 5%), conduct disorder (27% vs. 2%), anxiety (18% vs. 2%), and depression (14% vs. 1%). Only 33% of children with ADHD had no other comorbid conditions, 33% had one comorbidity, and 34% had two or more. Children in low-income families were significantly more likely than children in aff…