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To identify factors distinguishing adolescents across 3 groups: no self-harm, nonsuicidal self-injury (NSSI) only, and NSSI and suicide attempt (NSSI + SA).

Data were from the 2007 Minnesota Student Survey. The sample included 61,330 students in grades 9 and 12. Logistic regression analysis determined factors that best distinguished adolescents who reported NSSI from those who reported no self-harm, and adolescents who reported NSSI + SA. Final models were developed over 3 stages of analysis that tested the importance of variables within risk factor, protective factor, and co-occurring health-risk behavior domains.

For male and female subjects, factors that consistently distinguished youth who reported NSSI from those who reported no self-harm included depressive symptoms, hopelessness, physical abuse, less parent connectedness, running away from home, and …