Tahereh Dehdari - Assistant Professor, Department of Health Education and Health Promotion, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
Nasim Mirzaei - PhD Student, Department of Health Education and Health Promotion, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
Mohammad Hossein Taghdisi - Professor, Department of Health Education and Health Promotion, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
Ashkan Khosropour - Department of Mathematics, School of Mathematics, Firoozabad Branch, Islamic Azad University, Firoozabad, Iran
Najaf Zare - Professor, Department of Biostatistics, School of Medicine AND Infertility Research Center, Shiraz University of Medical Sciences, Shiraz, Iran

Background: Transtheoretical model (TTM) has been recognized as a common theoretical model in researches in terms of addictive behaviors. The aim of this study was to examine the psychometric properties of the Persian brief version of the TTM for hookah tobacco smoking cessation in a sample of Iranian rural adults who were in the preparation stage for hookah cessation.Methods: This was a validation study on Iranian rural adult hookah smokers by the TTM instrument. First, to translate the questionnaire items from English to Persian, backward-forward procedure was used. Face and content validity of the instrument items were assessed. Confirmatory factor analysis (CFA) was performed to determine the construct validity of the instrument. For this aim, ۳۰۰ participants completed the instrument. Cronbach's alpha coefficient and intraclass correlation coefficient (ICC) were calculated to examine the internal consistency and reliability of the subscales of the instrument.Findings: The content validity index (CVI) and content validity ratio (CVR) of the items were ≥ ۰.۸۰ and ≥ ۰.۶۰, respectively. Based on CFA, the data fitted the TTM model. root mean square error of approximation (RMSEA), the goodness of fit index (GFI), adjusted GFI, and comparative fit index (CFI) were ۰.۰۳۷, ۰.۹۶۰, ۰.۹۱۰, and ۰.۹۵۰, respectively. At this stage, ۶ items were deleted. The ICC and Cronbach's alpha of the subscales ranged between ۰.۶۰-۰.۷۴ and ۰.۷۱-۰.۸۶, respectively. The final instrument with ۲۹ items was confirmed.Conclusion: The findings suggest that translating Persian brief version of the TTM instrument was a reliable and valid tool to identify the determinants of hookah smoking cessation among Iranian rural adults.

Hookah smoking, Transtheoretical model, Scale, Psychometrics, Iran