Brief Severity Index for Nonsuicidal Self-Injury: Initial Validation of a Self-Report Measure

The aim of this study was to develop and provide validation evidence for a self-report measure of nonsuicidal self-injury (NSSI), the Brief Severity Index for NSSI (BSI-NSSI). We developed items to tap the new diagnostic classification for NSSI in the Diagnostic and Statistical Manual of Mental Disorders (5th ed., DSM-5; American Psychiatric Association.[APA], 2013). We also designed the measure to distinguish among gradations of NSSI severity. Data were collected from a sample of 843 young adults, 72 of whom had performed NSSI in the past year. Using Rasch analysis, we reached initial support for the validity and reliability of the BSI-NSSI. Implications for counseling and research are discussed.