Psychometric Properties of the Persian Version of the Interpersonal Mindfulness Scale (IMS) among Iranian Adolescents

Interpersonal mindfulness, involving present-moment awareness and acceptance during social interactions, is crucial for emotional regulation and adaptive interpersonal functioning. This study examined the psychometric properties of the Persian version of the Interpersonal Mindfulness Scale (IMS), a 27-item instrument with four subscales: presence, awareness of self and others, nonjudgmental acceptance, and nonreactivity. The cross-sectional sample included 15- to 17-year-old Iranian adolescents (2023–2024), recruited via convenience sampling. Participants completed the Persian version of the IMS alongside the Five-Facet Mindfulness Questionnaire (FFMQ), Mindful Attention Awareness Scale (MAAS), and Prosocial Personality Battery (PBS). Face and content validity were confirmed by expert reviews, with all items exceeding thresholds for Content Validity Ratio (CVR > 0.62, p < 0.05) and Content Validity Index (CVI > 0.79). Confirmatory Factor Analysis supported the original four-factor structure, demonstrating good model fit (CMIN/DF = 3.51, IFI = 0.91, CFI = 0.91, TLI = 0.90, RMSEA = 0.06). Convergent validity was acceptable, with Average Variance Extracted (AVE) close to or above 0.50 for most factors. Reliability analyses revealed strong internal consistency (Cronbach’s alpha: 0.77–0.92; overall 0.81) and good test-retest stability over one month (0.77–0.86). Construct validity was supported by significant positive correlations between IMS and FFMQ (r = 0.35, p < 0.01), MAAS (r = 0.57, p < 0.01), and PBS (r = 0.63, p < 0.01). These results indicate that the Persian IMS is a valid and reliable tool for assessing interpersonal mindfulness in Iranian adolescents.