Figure 2. Standardized Risk Estimates (SREs) of Suicide Attempt by Number of Past-Year Unit Suicide Attempts and Unit Size.

The SREs (number of soldiers who attempted suicide per 100 000 person-years) were calculated assuming other predictors were at their sample-wide means. The SREs were calculated separately for each unit size based on logistic regression models that included basic sociodemographic and service-related variables (sex, age at entry into the army, current age, race/ethnicity, educational level, marital status, time in service, deployment status, military occupation, and number of past-year unit suicide attempts) and included a dummy predictor variable for calendar month and year to control for secular trends.