Percentage of children aged 4 through 18 years, with a diagnosis of attention deficit/hyperactivity disorder (ADHD), who demonstrate a change score of 0.25 or greater on the Weiss Functional Impairment Rating Scale - Parent Report (WFIRS-P) within 2 to 6 months after an initial positive finding of functional impairment. Performance Rate Descriptions: Rate 1: The percentage of patients 4 to 18 years of age receiving a psychiatric or behavioral health intake visit  Rate 2: The percentage of patients 4 to 18 years of age receiving a psychiatric or behavioral health intake visit, and a clinically significant, baseline WFIRS-P total mean score of 0.65 or greater.