Abstract
The developmental course of attention-deficit/hyperactivity disorder (ADHD) symptoms (inattention, hyperactivity, impulsivity) from childhood to adolescence was described and compared based on parent and teacher report as a function of co-occurring conduct disorder/oppositional defiant disorder (CD/ODD) over 6 years. The moderating effect of gender was investigated. Participants were 291 children (6–13 years old; 79 girls) with ADHD: 91 with ADHD only and 200 with ADHD+CD/ODD. At study entry, boys and girls in the ADHD+CD/ODD group presented significantly more hyperactivity symptoms based on parent report and more impulsivity symptoms based on teacher report than did those in the ADHD-only group. ADHD symptoms, however, diminished on average over time in both groups, according to both parent and teacher report. However, as children in the ADHD+CD/ODD group, particularly girls, presented more symptoms at study entry, they tended to remain above the diagnostic threshold 6 years later. This suggests an association exists between co-occurring CD/ODD and ADHD persistence.
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