Perceived benefits and barriers of increased dietary fiber consumption: Validation of a decisional balance scale

Tehran University of Medical Sciences Journal of Nutritional Sciences and Dietetics 2 1 2016 01 29 Perceived benefits and barriers of increased dietary fiber consumption: Validation of a decisional balance scale 15 23 EN Parisa Keshani School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran Mohammad Tavousi Health Metrics Research Center, Iranian Institute for Health Sciences Research, ACECR, Tehran, Iran Ali Montazeri Health Metrics Research Centre, Iranian Institute for Health Sciences Research, ACECR, Tehran, Iran Maryam-Sadat Farvid Faculty of Nutrition Sciences and Food Technology, Shaheed Beheshti University of Medical Sciences, Tehran,Iran 2016 04 15 2016 08 14 Background: This study was conducted to develop and validate a scale in order to assess perceived benefits and barriers (decisional balance) to improving dietary fiber consumption in patients with type 2 diabetes (T2D). Methods: In order to develop the questionnaire, focus-group discussions, in-depth interviews and literature review were carried out. Validity of the questionnaire was assessed using content validity, face validity and construct validity. The factor structure of the questionnaire was also extracted by performing both principle component analysis (PCA) and confirmatory factor analyses. Reliability was then estimated using internal consistency and test-retest analysis. Two groups of T2D patients participated in the study. 146 T2D patients participated in the content validity and the other 265 T2D patients were those whose data were used for the confirmatory factor analysis Results: The mean age of the participants was 52.3±7.6 years. PCA indicated two components representing benefits (Cronbach’s α=0.75) and barriers (Cronbach’s α=0.71). Confirmatory factor analysis supported the two-component structure [Goodness of Fit Index = 0.94, χ 2/df=1.56 (χ 2 =118.28, df=76, p <0.001), RMSEA=0.046]. The Test–retest results, measured by interclass correlation (ICC), for all the items were between 0.62 and 0.78. Conclusion: The designed questionnaire is valid and reliable to assess perceived benefits and barriers of dietary fiber intake in patients with T2D. https://jnsd.tums.ac.ir/index.php/jnsd/article/view/46 https://jnsd.tums.ac.ir/index.php/jnsd/article/download/46/30