Measures
Nonsuicidal Self-injury. Inventory of Statements about Self-Injury (ISAS; Klonsky & Glenn, 2009) was used to determine the presence of NSSI history. The ISAS is a self-report measure that assesses lifetime NSSI engagement across 12 forms of NSSI (i.e., self-cutting, self-burning, etc.); participants were determined to have a lifetime history of NSSI if they reported at least two NSSI acts. The psychometric properties of the ISAS have been supported (Klonsky & Glenn, 2009; Glenn & Klonsky, 2011).
Emotion Dysregulation. The Difficulties in Emotion Regulation Scale (DERS; Gratz & Roemer, 2004) is a self-report measure that assesses six dimensions of emotion dysregulation; for the present study only the overall index of emotion dysregulation was utilized. The DERS internal consistency, re-test reliability, and construct and predictive validity have been supported (Gratz & Roemer, 2004). Total scores in this sample demonstrated adequate internal consistency (α = .90).
Interpersonal Stressor Interview. Consistent with past research (Gratz et al., 2011), participants completed a semi-structured interview about a recent upsetting interpersonal conflict (i.e., where they were “very upset or angry”), wherein they were asked specific details about the event (e.g., location), as well as specific emotions, physical sensations, and thoughts that occurred at the time of the conflict. Each interview took approximately 10 minutes to complete. All interviews were transcribed verbatim for use in the current study.