cultural adaptation and psychometric properties of social cognitive scales related to substance use behavior in iranian adolescents

Background: using cultural-adapted scales and inventories is important both in research and treatment. there is not an iranian version of social cognitive scales related to substance use behavior. objectives: the aim of this research was to examine factorial validity and reliability of the iranian version of social cognitive scales related to adolescent substance use behavior. patients and methods: this study was cross-sectional research using astratified, two stage, cluster sampling based on the popuation of different areas of isfahan city in iran. 720 adolescents aged 14 to 18years old completed the questionnairs: european drug abuse prevention (eudap) and the peer influence scale. the translation and back-translation, and cultural adaptation with face and content validity, were done in the first step. factorial and construct validity were assessed in 3 steps, including: item analysis, explanatory analysis and confirmatory factor analysis. reliability was also assessed with cronbach's alph. results: in the cultural adaption, some of the items were changed or removed according to the experts’ view. the efa in the cross sectional study showed appropriate loading items and revealed a 23-item scale with 5 factors including: refusal self-efficacy, negative and positive outcome expectancies, intention, and peer influence, which was in line with the original questionnaires. the result of confirmatory factor analysis showed appropriate fit indices for 5 factor model including (x² = 522, df = 144, x²/ df = 3.6, rmsea = 0.06, cfi = 0.94, ifi = 0.94, and nfi = 0.92). internal consistency was found to be in the range of 0.74 to 0.89 for all subscales. conclusions: the results of this study indicate that the persian version of social cognitive determinant appears to be a psychometrically robust instrument and could significantly predict substance use behavior in iranian adolescents.