Distribution of high-risk scores on the BASC (see text for details). The first column represents the percentage of high-risk scores expected in the normal population (healthy control subjects). The subsequent columns show the proportion of children receiving high-risk scores for inattention and hyperactivity as rated by parents and teachers. For all of the categories, a statistically significant greater proportion of high-risk scores was given to the children with CHD compared with the expected proportion in healthy control subjects.