Psychometric Properties of the Persian Version of the Weight Loss Motivation Questionnaire (WLM-Q) among Overweight and Obese Individuals

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 Cronbachchr('39')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.