At medial-lateral centroparietal sites (P3/4, P7/8, CP5/6, C3/4) for factor 630, there was also a highly significant main effect of intensity, F(1,63) = 74.5, p < .0001, stemming from a greater P2 source for high than low odor concentration (Figure 3B, bottom; for detailed ANOVA means, see supplementary Table A2). A significant group main effect, F(1,63) = 6.48, p = .01, and a highly significant Group × Intensity interaction, F(1,63) = 14.0, p = .0004, indicated smaller P2 source in patients compared to healthy adults, which was significant for high (simple group main effect, F(1,63) = 16.3, p = .0001) but not low intensity stimuli, F(1,63) < 1.0, n.s. A significant hemisphere main effect, F(1,63) = 5.99, p = .02, resulted from right-larger-than-left P2 source across groups. A greater P2 source in women compared with men for both controls (M ± SD, 0.71 ± 0.94 vs. 0.40 ± 0.81) and patients (0.38 ± 0.77 vs. 0.31 ± 0.72) yielded a significant gender main effect, F(1,63) = 5.41, p = .02.
