Objectives：Children with attention-deficit hyperactivity disorder (ADHD) have problems in social interactions. We compared the effect of 10-session social skill training (SST) among two groups, children with pure ADHD, and those with ADHD with comorbidity.

Methods：Consecutive 10-session SST was conducted for 34 children from 2006 to 2012. There were 22 children with pure ADHD (male 20, female 2), and 12 children suffering from ADHD with comorbidity (male 11, female 1). All children took medication as prescribed by their doctors before the start of SST. The Child Behavior Checklist (CBCL), the Korean Personality Inventory for Children (K-PIC), the Conner’s Rating Scale, the ADHD Rating Scale, and the Home Situation Questionnaire were completed by mothers before and after the SST. All children completed the Child Depression Inventory, the Stat-Trait Anxiety Inventory for Children, the Self-Concept Scale and the ADHD Diagnostic System before and after the SST.

Results：Only children with pure ADHD showed improvement in anxiety and self-concept in scales rated by children. In the CBCL rated by parents, the pure ADHD group and the ADHD with comorbidity showed improvement in both externalizing and internalizing subscales. In the K-PIC rated by parents, the pure ADHD group showed improvement in most outcomes and ADHD with comorbidity showed positive change in verbal development.

Conclusion：These results suggest that SST has significant positive effects on both the pure ADHD and ADHD with comorbidity group. Further research is needed in order to target diverse comorbidity groups with ADHD to improve the effectiveness of the SST.