The Association of Predeployment and Deployment-Related Factors on Dimensions of Postdeployment Wellness in US Military Service Members

Purpose. To assess the effects of predeployment and deployment-related factors on dimensions of wellness following deployment. Design. Prospective longitudinal study. The dependent variable was dimensions of wellness. Independent variables were measured in terms of modifiable, nonmodifiable, and military factors, such as sex, race/ethnicity, service branch, smoking status, and combat experience. Setting. A large military cohort participating in the Millennium Cohort Study. Subjects. Included 10,228 participants who deployed in support of the operations in Iraq and Afghanistan. Measures. Dimensions of wellness were measured by using standardized instruments assessing self-reported physical health, mental health, and stress. Covariates were measured by using self-reported and electronic data. Analysis. Factors of postdeployment wellness were assessed by using ordinal logistic regression. Results. Most participants (78.7%) were categorized as "moderately well" post deployment. Significant modifiable predeployment predictors of postdeployment wellness included normal/underweight body mass index (odds ratio [OR] = 1.72, p < .05). Military factors significantly associated with wellness included not experiencing combat (OR = .56, p < .05), member of Air Force (OR = 2.02, p < .05) or Navy/Coast Guard (OR = 1.47, p < .05), and combat specialist occupation (OR = 1.22, p < .05). Conclusion. Multiple modifiable factors associated with postdeployment wellness were identified, which may help inform medical and military leadership on potential strategies to ensure a well force. Those trained in combat roles were more likely to be well post deployment though this apparent benefit was not conferred onto those reporting combat experiences.