The main purpose of this study was to investigate the effect of stress and egocentricity on depression and aggression mediated by emotion regulation difficulties. The statistical population of this study was adults (20-60 years old) in Isfahan in 2017 and 700 participants were selected by convenience sampling method. The measures consisted of Aggression questionnaire (Bryant & Smith, 2001), the Difficulties in Emotion Regulation Scale (Gratz & Roemer, 2004), the Depression, Anxiety, and Stress Scales (Lovibond & Lovibond, 1995), Psychopathic Personality Inventory-Revised (Sörman, 2016), Symptom Checklist-90- Revised (Derogatis, 1997). The structural equations modeling, Bootstrapping, and analysis of variance method have been used for data analysis.The results confirmed the direct effect of egocentricity on difficulties in Emotion Regulation and aggression. The results showed the direct effect of stress on Emotion Regulation difficulties and depression. Emotion Regulation difficulties have a direct effect on depression and aggression. The mediating analysis showed that stress has an indirect effect on depression mediated by difficulty in emotion regulation. Results highlight the role of emotion regulation difficulties and poverty in the prevalence and persistence of depression and aggression.
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