NR3C1 and post-traumatic stress disorder: Post-hoc Spearman correlations indicated that interaction was significant because maternal NR3C1 correlated with child NR3C1 methylation among mothers in the PTSD group, but not among mothers in the non-PTSD group (see Figure 1, Spearman correlations overall: rs = 0.36, p = 0.014, PTSD: rs = 0.71, p < 0.001, non-PTSD: rs = −0.08, p = 0.73).