Table 3 summarizes results of the univariate analyses, showing the Z-score and portion of variance explained by each component for each diagnostic group (represented by McKelvey & Zavoina’s pseudo-R2 , the measure of probit regression model performance that most closely approximates ordinary least squares regression’s measure of explained variance, R2 ; (Hagle & Mitchell, 1992; Veall & Zimmerman, 1994)). Results show that, with few exceptions, each component successfully discriminated diagnostic from control groups. The exceptions, however, were only marginally non-significant with p-values ≤ 0.1 (in ADHD and DAD: p=0.06 for PC4, p=0.07 for PC5; p=0.1 for P3 in ADHD). In all cases, significant discriminative ability was based on reduced amplitudes in the diagnostic group compared to the control group.
