Journal of

Over the years, weight loss motivation has been introduced as an important factor in weight loss and its stability. The purpose of the present study was to investigate psychometric properties of the Motivation for Weight Loss Questionnaire (WLM-Q) among overweight and obese Individuals. In this study, the Persian version of the WLM-Q prepared using back-translation was administrated to 453 individuals referring to diet therapy centres in Tehran. The internal consistency of the Persian version of the WLM-Q was assessed via Cronbach’s alpha. Moreover, the factor structure of the scale was assessed using confirmatory and exploratory factor analysis. The results of Cronbach's alpha for the whole scale was 0.82 and for the three extracted factors of health, appearance in relation to others, and appearance in relation to oneself, were 0.86, 0.85 and 0.74 respectively. The results indicated the desirable internal consistency of the scale and its components. The outcome of confirmatory factor analysis supported the factor structure obtained from exploratory factor analysis and the fit indices demonstrated a good model fit. In general, it can be concluded that the Persian version of the WLM-Q has desirable psychometric properties and is a reliable instrument for research and clinical settings.

The purpose of the present study was to investigate the psychometric properties of the Persian version of the Valuing Questionnaire (VQ) in people who engaged in weight loss or weight loss maintenance. In this descriptive study, 420 men and women were selected through consecutive sampling and respond to the Persian version of the VQ and the Self-compassion Scale (SCS). To assess the validity of the questionnaire, construct validity (exploratory factor analysis and confirmatory factor analysis) and convergent validity was used. The reliability of the questionnaire was assessed via internal consistency. Exploratory factor analysis of VQ’s items revealed two factors named progress and obstruction, but, at the item level, it was different from the original model of the questionnaire. For two extracted factors, Cronbach’s alphas range was 0.73 to 0.85 suggesting satisfying reliability of the Persian version of the VQ.  Confirmatory factor analysis supported the original two factor model of the questionnaire, and fit indices indicated a good model fit. The convergent validity of the questionnaire was also adequate. The Persian version of the VQ has adequate reliability and validity in Iranian society and is a good self-report for research and clinical settings.