Abstract

The purpose of this study was to examine the mediating effect of rumination moderated by entrapment in the relationship between maladaptive perfectionism and Non-Suicidal Self-Injury (NSSI). This study selected young adults aged 19 to 35 years as study subjects utilizing The Functional Assessment of Self-Mutilation, Maladaptive Perfectionism Scale, Korean- Ruminative Response Scale, and Entrapment Scale. Data of 320 participants were analyzed using IBM SPSS Statistics v22.0 and Hayes (2022) PROCESS Macro v4.0. Results of this study are summarized as follows. First, the mediating effect of rumination in the relationship between maladaptive perfectionism and NSSI was insignificant. Second, the moderating effect of entrapment in the relationship between rumination and NSSI was significant. Third, the moderated mediating effect of entrapment in the relationship between maladaptive perfectionism, rumination, and NSSI was significant. Finally, clinical significance, therapeutic implications, and limitations of this study are discussed.