Participant characteristics are summarized in Table 1. Table 1.A summarizes the characteristics of participants involved in the comparison analysis (section 1), where children with ADHD-C and controls were included. Age did not vary across groups, but the proportion of male and female participants was different, as expected, since ADHD is more common among males. Estimated IQ was in the normal range for all the participants, but as it is commonly found, the ADHD group had a lower estimated full-scale IQ than the control group. Additional analysis was performed to verify whether IQ differences might have accounted for the findings (see Section 1 below). For the comparison analysis, as mentioned before, the controls and children with ADHD-C were matched for FD. The groups did not differ significantly on ln(k); however, when controlling for age, controls and ADHD-C were significantly different in ln(k) (p value = 0.027).
