Year: 2018 Source: rchives of Suicide Research. (2018). 22(3): 453-464. SIEC No: 20180509

Military psychiatric inpatients with and without a lifetime history of non-suicidal self-injury (NSSI), combined with a history of at least one suicide attempt, were compared on suicide ideation severity, number of suicide attempts, and Interpersonal-Psychological Theory of Suicide variables. Data were derived from baseline assessments performed in a psychotherapy randomized controlled trial. Lifetime history of NSSI and lifetime number of suicide attempts were assessed using the Columbia Suicide Severity Rating Scale (C-SSRS; Posner et al., 2011Posner, K.Brown, G. K.Stanley, B.Brent, D. A.Yershova, K. V.Oquendo, M. A., … Mann, J. J. (2011). The Columbia–suicide severity rating scale: Initial validity and internal consistency findings from three multisite studies with adolescents and adultsAmerican Journal of Psychiatry168(12), 12661277. doi:10.1176/appi.ajp.2011.10111704[Crossref][PubMed][Web of Science ®][Google Scholar]). Individuals with versus without a combined lifetime history of attempted suicide and NSSI showed significant elevations on thwarted belongingness and acquired capability for suicide. No significant between-group differences were found on perceived burdensomeness, frequency, duration, and controllability of suicide ideation, or number of lifetime suicide attempts. A history of NSSI, above and beyond attempted suicide, appears to increase service members’ social alienation and acquired capability for suicide.