As shown in Table 3, the main effect of risk group was highly significant [F = 20.83; p < 0.0001], showing that HR subjects [2.96 (0.01)] manifested significantly lower theta power than their LR counterparts [3.10 (0.03)]. Significant risk group × region interaction effect revealed that the difference between HR and LR subjects were significant in all four regions, and that the highest difference was observed in the parietal region [HR = 3.01 (0.01); LR = 3.18 (0.03); F = 22.92; p < 0.0001], followed by central [HR = 2.96 (0.01); LR = 3.12 (0.03); F = 21.92; p < 0.0001], occipital [HR = 2.95 (0.01); LR = 3.10 (0.03); F = 20.10; p < 0.0001], and frontal regions [HR = 2.92 (0.01); LR = 3.01 (0.03); F = 7.53; p = 0.0061]. Due to the highly significant main effect of risk group, most of the interaction effects of risk group were not significant (see Table 3) but most of the comparisons (HR vs. LR) within each of these interaction effects were significant (HR < LR) as shown in Table 4.
