Childhood Adversity, Deployment-Related Stress, and Mental Health in the Canadian Armed Forces

Abstract

Background: For decades, researchers have been striving to better understand the complex mix of factors underlying post-combat mental illness, in the hope of enabling better outcomes for military personnel. This study focuses on investigating the behavior and possible interaction of two risk factors for poor mental health post-deployment to a combat mission: adverse childhood experience (ACE) and deployment-related stressful experience (DRSE). Methods: A longitudinal dataset linking data from 3302 military personnel at recruitment to data collected post-deployment to Canada’s mission in Afghanistan was analysed, using novel scoring systems for exposure classification. Results: Significant ACE-DRSE interaction terms were found in relation to SF-36 MCS, depression and suicidal ideation: the negative effect DRSE had on mental health outcomes was amplified as ACE levels increased. Conclusion: Individuals with a history of childhood adversity are more susceptible to the negative mental health impacts of stressful experiences during deployment to a combat zone.