Association of a History of Incarceration and Solitary Confinement with Suicide-Related Outcomes in a General Population Sample from Two U.S. Cities

Objectives: To evaluate whether a history of incarceration was associated with increased odds of suicidal ideation and suicide attempts, and to determine if this association was further strengthened when combined with a history of solitary confinement. Methods: We collected cross-sectional data from a general population sample in New York City and Baltimore in March 2017. Participants were categorized based on their history of incarceration and solitary confinement: (1) no incarceration, (2) incarceration-only, and (3) incarceration plus solitary confinement. We compared these three groups, utilizing hierarchical adjustments for sociodemographic factors and adverse childhood experiences. Missing data were accounted for utilizing multiple imputation via chained equation. Results: A total of 1221 individuals were analyzed. Those who experienced both incarceration and solitary confinement consistently had higher odds of suicidal ideation (OR, 2.80; 95% CI, 1.43 to 5.48) and suicide attempts (OR, 6.98; 95% CI, 2.77 to 17.61) than never incarcerated individuals. Those who experienced incarceration without solitary confinement had higher odds of suicide attempts (OR, 3.77; 95% CI, 1.35 to 10.56) than never incarcerated individuals, whereas this association was not evident for suicidal ideation. Solitary confinement increased the odds of suicidal ideation even compared to incarceration without solitary confinement (OR, 2.71; 95% CI, 1.09 to 6.74). Conclusions: Our findings support the need to address the higher likelihood of suicide-related outcomes among those in contact with the criminal justice system, and to consider alternatives to solitary confinement.