Table 3 lists the main and interaction effects in the RM-ANOVA model, and Fig. 4 illustrates the pairwise comparisons of the estimated marginal means of the P3 amplitude between the levels of risk groups, gender, and age groups at each scalp region for the loss and gain conditions. P3 amplitude showed significant main effects for age group, condition, and region along with the following 2-way and 3-way interaction effects: (i) age group × gender, (ii) age group × region, (iii) gender × region, (iv) condition × region, (v) risk group × condition × region, (vi) gender × condition × region (Table 3). These results are explained for each major factor (risk group, gender, and age group) in the order of higher order (complex) to lower order (simpler) effects in the subsections below.
