Mean percent endorsement among children with ADHD (% ADHD endorsement), children without ADHD (% Non-ADHD endorsement), and mean net endorsement (% ADHD endorsement - % Non-ADHD endorsement) for inattentive (IN) and hyperactive/impulsive (HI) symptom domains at three time-points (T1, T2, T3). Repeated measures ANOVAs of % ADHD endorsement and net endorsement yielded no significant main effects, but both yielded significant Symptom Type x Time interactions (p<.001 for both variables). For % Non-ADHD endorsement there was a significant main effect of Time (p=.017) and a Symptom Type x Time interaction (p=.001).