CRP and post-traumatic stress disorder: However, these authors showed interesting differences between the genders: In women, endogenous OXT levels were positively correlated with cooperativeness (r = 0.41, p = 0.01), whereas in men these levels were negatively correlated with C-reactive protein (r = −0.22, p < 0.01), which indicates that OXT plays a role in the coping strategies for PTSD symptoms among women.