Since the age difference across the groups was statistically significant (p < 0.001), the association of age with significant predictor variables from the RF analysis was calculated within each group using bivariate Pearson correlation and in the total sample using partial correlation adjusted for the group effect (Table 4) as an exploratory (descriptive) analysis. It was found that there was no significant association of age with the top significant variables in any of the groups or in the total sample, after correcting for multiple comparisons. However, a single FC variable (FC_6_7) representing the connectivity between the right amygdala and left hippocampus was significant (r = 0.38; p = 0.0374), but it did not survive multiple testing correction.
