Internal reliability was assessed by Kuder–Richarson Formula 20 and Cronbach’s alpha coefficient and external reliability by interclass correlation coefficient among participants who completed the instrument at baseline and two weeks later ( n = 28). Construct validity was assessed via principal component analysis (PCA) and the ‘known-groups’ method. Item reduction analysis was assessed by item difficulty index, discrimination index and point-biserial correlation. Items considered irrelevant were removed and the refined questionnaire was administered to dietitians with different levels of IBS experience ( n = 154) for further psychometric testing.
Academic/senior clinical dietitians ( n = 5) provided written feedback and a focus group ( n = 4 gastroenterology dietitians) was undertaken to evaluate content and face validity of the question-items. Subjects/MethodsĪn initial pool of 151 questions was generated addressing three domains (knowledge, attitudes, practices).
To develop and validate a questionnaire assessing knowledge, attitudes and practices in the dietary management of IBS.
0 kommentar(er)
