Combat exposure and risk for suicidal thoughts and behaviors among military personnel and veterans: A systematic review and meta-analysis.

Due to seemingly mixed empirical results, questions persist about the possible role of deployments and combat exposure. We conducted a narrative review and meta-analysis of 22 published studies to integrate findings regarding the relationship of deployment-related predictors (i.e., deployment, deployment to a combat zone, combat experience, and exposure to specific combat events) with suicide-related outcomes (i.e., suicide ideation, attempt, and death). Across all predictors and outcomes, the combined effect was small and positive, r = .08 0.04, 0.13, and marked by significant heterogeneity, I2 = 99.9%, Q(21)=4880.16, p < .0001, corresponding to a 25% increased risk for suicide-related outcomes among those who have deployed. Studies examining the relationship between exposure to killing and atrocities (k = 5) showed the largest combined effect, r = .12 0.08, 0.17, and less heterogeneity, I2 = 84.4%, Q(4)=34.96, p < .0001, corresponding to a 43% increased risk for suicide-related outcomes among those exposed to killing or atrocity. Implications for theory, research, and clinical practice are discussed.

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