Perceived effectiveness of NSSI in achieving functions on severity and suicide risk.

Nonsuicidal self-injury (NSSI) continues to be a psychiatric problem for youth and young adults, and is a robust risk factor for suicidal thoughts and behaviors. Research has established that NSSI is motivated by intrapersonal and interpersonal functions; however, research on the perceived effectiveness of NSSI for achieving the desired functions is lacking. In the current study, it was expected that using NSSI to achieve intrapersonal functions would be rated as more effective than interpersonal functions, and that perceived effectiveness of NSSI would be differentially related to NSSI severity and suicide risk outcomes. In a sample of 264 adults with lifetime NSSI history (over 70% past year), intrapersonal functions were endorsed more than interpersonal functions, and were rated as significantly more effective. Overall, perceived effectiveness of NSSI for intrapersonal functions was significantly and positively predictive of NSSI severity, while interpersonal functions were significantly and negatively related. Perceived effectiveness of NSSI for intrapersonal functions, but not interpersonal functions, were significantly predictive of more frequent and intense suicide ideation and greater likelihood of suicide plans and attempts. Results highlight the importance of assessing the perceived effectiveness of NSSI for specific functions in identifying individuals at risk for more severe NSSI and suicide.