Abstract Introduction Gross’s Emotion Regulation Questionnaire is one of the most widely-used and valid questionnaires for assessing emotion regulation strategies. The validity and reliability of the Persian version have not been determined and data on its psychometric properties are not available to Iranian mental health researchers. The purpose of this study was to determine the psychometric properties of the Emotion Regulation Questionnaire in Iranian students. Methodology In this cross-sectional study, 348 students (170 males and 178 females) were selected from Shahid Beheshti University of Medical Science and Tehran University of Medical Science. The following statistical procedures were conducted: correlation coefficients, factor analysis, Cronbach’s alpha, and independent t tests. Results The results showed that men use suppression more than women (T = -2.62, p = 0.009). Cronbach’s alpha coefficients were 0.76 for the cognitive reappraisal sub-scale and 0.72 for the suppression sub-scale (excluding question 9). Six questions related to the cognitive reappraisal factor explained 30.97% of emotion regulation variance, and 3 questions related to the suppression factor explained 22.59% of emotion regulation variance. Overall, these factors explained 53.5% of emotion regulation variance. There were significant correlations between suppression and difficulties in emotion regulation, trait anxiety, and affective control. Furthermore, there was a significant correlation between cognitive reappraisal and the Five-Facet Mindfulness Questionnaire. Conclusion The results indicate that the Persian version of the ERQ is a reliable and valid instrument that can be helpful for development of further important studies of emotional regulation.

Abstract Introduction Depression is one of the most important psychiatric disorders, and the rate of recurrence is high. The heavy cost burden of depression is probably due to treatment-resistant depression. The purpose of this study was to determine the effectiveness of mindfulness-based cognitive therapy (MBCT) in patients with treatment-resistant depression (TRD). Method The present study was a quasi-experimental study conducted with twenty-four patients with treatment-resistant depression. Participants were selected by purposive sampling and randomly assigned to two groups, an experimental group and a control group. The experimental group received MBCT and antidepressants, while the control group received antidepressants only. The Hamilton and Beck Depression Inventory, Self-Compassion Scale, Thought Rumination Scale, and Mindfulness Scale were administered. The treatment program was conducted in eight sessions; with a follow-up period of one month subsequent to treatment termination. Data were analyzed using descriptive statistics (mean and standard deviation) and inferential statistics (analysis of variance for repeated measures and Bonferroni’s post-hoc test). Results The results showed that MBCT significantly reduced depression and ruminative thinking in the experimental group and also improved mediators such as mindfulness and self-compassion. Patients maintained gains over the one month follow-up period (p < 0.01). Conclusion The present study provides additional evidence for the effectiveness of MBCT for TRD.