“…Nonsuicidal selfâinjury (NSSI) occurs in approximately 3%â6% of the adult general population (Klonsky, 2011; Liu, 2021; Plener et al, 2016; Swannell et al, 2014), 17%â27% of adolescents (Monto et al, 2018; Swannell et al, 2014; Zetterqvist et al, 2021), 13%â18% of young adults (Kiekens et al, 2021; Swannell et al, 2014), and up to 80% of clinical populations (Auerbach et al, 2014; Clarkin et al, 1983; Gunderson & Ridolfi, 2001). In addition to being associated with functional impairment and numerous psychiatric disorders (e.g., depression, posttraumatic stress disorder [PTSD], borderline personality disorder [BPD]; Bentley et al, 2015; Gratz et al, 2015; Patel et al, 2021), NSSI is a robust predictor of suicidal thoughts and behaviors (Asarnow et al, 2011; Franklin et al, 2017). Further, recurrent NSSI was included as a âcondition for further studyâ within the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSMâ5; American Psychiatric Association, 2013), with the diagnostic criteria for NSSI disorder (NSSID) including engagement in NSSI on at least five days in the past year (Criterion A); the expectation that NSSI will regulate emotions and/or resolve interpersonal difficulties (Criterion B); the experience of negative feelings or thoughts immediately prior to NSSI, and/or preoccupation with or frequent thoughts related to NSSI (Criterion C); and the presence of significant distress or impairment (Criterion E), among others.…”