In adults with PTSD we also noticed that aberrant DNAm of the oxytocin receptor gene was present in PTSD adult females, but not in males, which underlines differences in the etiology of PTSD between males and females as it has also been suggested between adults and children (Nawijn et al., 2019; Ensink et al., 2021). This evidence concerns the gene OXTR and post-traumatic stress disorder.