The purpose of this study is to verify the mediating effect of difficulties in emotional regulation in the impact of complex trauma on nonsuicidal self-injury in adults. To test the model, data were collected from 350 adults using scales for traumatic experience, nonsuicidal self-injury, and difficulties in emotional regulation. The mediating effect was verified through regression analysis using SPSS 29.0 and Process Macro. As a result of the study, first, complex trauma, difficulties in emotional regulation, and non-suicidal self-harm were all found to have a positive significant correlation. Second, difficulties in emotional regulation was found to have a partial mediating effect in the relationship between complex trauma and non-suicidal self-harm. Third, the subfactors of difficulties in emotional regulation were found to have differences in mediating effects. This study is significant in that it confirmed the effect of complex trauma on non-suicidal self-harm in adults and suggested implications for therapeutic intervention to improve emotional regulation ability.
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