OBJECTIVE
Though most veterans with Posttraumatic Stress Disorder (PTSD) are not violent, research has demonstrated that there is substantial minority who are at increased risk. This study tested hypotheses regarding hyperarousal symptoms and hostile cognitions (i.e. “hostility”) as potential mechanisms of the association between PTSD and physical aggression in a longitudinal sample of Iraq/Afghanistan era veterans.
METHOD
U.S. veterans between the ages of 18 and 70 who served in the military after September 11, 2001 were eligible for participation. At baseline, 301 veterans were evaluated for PTSD and completed self-report measures of hostility. At 6 month follow-up 275 veterans and their family members or friends reported on the veteran’s physical aggression over the preceding interval. OLS and logistic regression were used to evaluate relationships among PTSD status, hyperarousal cluster symptoms, and hostility at baseline, and physical aggression at 6 months. Bootstrapping was used to test for the mediation of baseline PTSD and 6-month aggression by hostility.
RESULTS
PTSD significantly predicted physical aggression over 6 months, but hyperarousal cluster symptoms did not account for unique variance among the three clusters. Hostility partially mediated the association of PTSD at baseline and physical aggression at 6 months.
CONCLUSIONS
Hostility may be a mechanism of the association of PTSD and physical aggression in veterans, suggesting the potential utility of targeting hostile cognitions in therapy for anger and aggression in veterans with PTSD.