Table 5 also presents the results of the MANCOVA performed on this subset of ERO measures, with the P3b amplitude at Pz as a covariate. The MANCOVA group effect was not significant (F(4,90) = 1.833, p = 0.129) after removal of P3b variance. Although the MANCOVA is non-significant, follow-up univariate analyses are included so that univariate effect sizes can be compared before and after removal of P3b variance. Only θ2 EROTOT power at Cz had a p-value below 0.05, providing a weak indication that this measure may provide discriminatory power beyond P3b amplitude.
