DRD2 and post-traumatic stress disorder: The simple moderation model in the PROCESS showed that after entering the genotype × CAPS score interaction in the model, there was a significant change in F (ΔF = 5.01, p = 0.008, ΔR2 = 0.05) for the left CA3 volume, withstanding FDR correction for multiple tests (p = 0.048), suggesting that the DRD2 Taq1A polymorphism moderated the effect of PTSD symptom on the volume of the left CA3.