OXT and post-traumatic stress disorder: The interindividual differences dependent effect of oxytocin in our clinical study, i.e. a beneficial oxytocin effect on PTSD symptom development in individuals with high acute PTSD symptom severity only, is in line with previous observations that intranasal oxytocin effects depend on the presence and/or severity of psychiatric symptom (Bertsch et al., 2013; Cardoso et al., 2014; Dodhia et al., 2014; Koch et al., 2016a; Nawijn et al., 2016b).