The relationship between interpersonal trauma history and the functions of non-suicidal self-injury in young adults: An experience sampling study.

Non-suicidal self-injury (NSSI) has been reported to serve a range of functions for individuals who engage in it. Despite considerable variation in NSSI functions between individuals, limited attention has been paid to exploring relationships between NSSI functions and other characteristics of self-injuring individuals, such as trauma history. This is despite allusion to trauma history in the suggested etiology of some NSSI functions (e.g., anti-dissociation, self-punishment). The present study used a 21-day online daily diary to explore possible relationships between common NSSI functions and past interpersonal trauma in community young adults (n = 38). The interpersonal boundaries and anti-dissociation functions significantly related to interpersonal trauma severity in multiple regression analyses; the interpersonal boundaries function continued to significantly relate to interpersonal trauma severity when controlling for the number of NSSI functions endorsed.