Mahdieh Barzegari-Soltan-Ahmadi - Department of Clinical Psychology, Faculty of Humanities, Shahed University, Tehran, Iran
Hamid Yaghubi - Department of Clinical Psychology, Faculty of Humanities, Shahed University, Tehran, Iran
Mohammad Gholami-Fesharaki - Department of Biostatistics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran

Introduction: Trauma may have psychopathological effects, but also improvements that are considered beneficial (i.e., posttraumatic growth). An influence on people's beliefs is needed for significant progress to occur, and can be calculated by the Core Beliefs Inventory (CBI). The aim of the present study was to examine the validity and reliability of the Persian version of the CBI. Method: In a cross-section study, the Persian version of the CBI was submitted to ۲۱۱ university students in the year ۲۰۲۱. Confirmatory Factor Analysis (CFA), reliability and predictive validity were used for the psychometric properties. For evaluating the predictive validity, the Posttraumatic Growth Inventory (PTGI) was used. The SPSS version ۲۱, AMOS version ۱۸ and PLS version ۲ were also used to analyze the data. Results: Cronbach’s alpha and composite reliability for CBI were ۰.۸۴ and ۰.۹۴ respectively. The CFA (RMSEA=۰.۰۲۶, relative Chi–square =۱.۷۷, GFI=۰.۹۶۲, AGFI=۰.۹۱۸) showed adequate construct validity of the CBI. More results also showed that the CBI score significantly predicted the of PTGI score (r=۰.۲۵, p<۰.۰۰۱) and good convergent validity (AVE=۰.۶۱). Conclusion: The results of the research revealed the validity and reliability of the Persian version of the CBI questioner at a very desirable level, thus making it a valid and reliable instrument in evaluating the core beliefs.

Core Beliefs Inventory (CBI), Validity, Reliability, Psychometric properties