The response of ADHD symptoms was measured using the 18-question ADHDRS. Depressive symptoms were measured using the Children's Depression Rating Scale.
For inclusion in the ADHD group, children must have received a prior diagnosis of ADHD, must have had at least eight items endorsed at or above a "2" on the ADHD Rating Scale (ADHDRS; DuPaul, 1990) and a T-score of greater than 65 on the Attentional Problems Subscale of the Child Behavior Checklist (CBCL, Achenbach, 1991).
The number of diagnostic items endorsed on the ADHDRS by parents ranged from 4 to 14.