Faculty of Life Sciences and Medicine, Nutritional Sciences, King's College London, 150 Stamford Street, London, SE1 9NH, UK.
Faculty of Life Course and Population Sciences, Department of Women and Children's Health, King's College London, St Thomas' Hospital, London, SE1 7EH, UK.
Eur J Clin Nutr. 2023 Sep;77(9):911-918. doi: 10.1038/s41430-023-01306-7. Epub 2023 Jul 12.
To develop and validate a questionnaire assessing knowledge, attitudes and practices in the dietary management of IBS.
SUBJECTS/METHODS: An initial pool of 151 questions was generated addressing three domains (knowledge, attitudes, practices). 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. 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. Item reduction analysis was assessed by item difficulty index, discrimination index and point-biserial correlation. Construct validity was assessed via principal component analysis (PCA) and the 'known-groups' method. 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).
Face and content validity resulted in the removal of 61 items from the initial 151 items. Psychometric testing was applied to the refined 90-item questionnaire administered to participating dietitians, resulting in the final 46-item questionnaire. Six factors were extracted by PCA with varimax rotation explaining 59.2% of the total variance. Partial confirmatory factor analysis showed an acceptable model fit (χ2/df = 2.11, CFI = 0.97, TLI = 0.96, RMSEA = 0.08, SRMR = 0.05). Significant differences were found in sum scores among dietitians with different levels of IBS experience. Internal reliability was >0.7 for each factor. External reliability was >0.6 for each factor and >0.7 for overall items of each domain.
A validated questionnaire to use in practice and research to assess knowledge, attitudes and practices in the dietary management of IBS has been developed.
开发并验证用于评估 IBS 饮食管理的知识、态度和实践的问卷。
最初生成了一个包含 151 个问题的问题库，涵盖了三个领域（知识、态度、实践）。学术/高级临床营养师（n=5）提供了书面反馈，一个焦点小组（n=4 名胃肠病学营养师）进行了评估，以评估问题项目的内容和表面效度。认为不相关的项目被删除，然后将经过修订的问卷分发给具有不同 IBS 经验水平的营养师（n=154）进行进一步的心理测量测试。通过项目难度指数、区分指数和点二项式相关来评估项目减少分析。通过主成分分析（PCA）和“已知群体”方法评估结构有效性。通过 Kuder-Richarson 公式 20 和 Cronbach 的 alpha 系数评估内部信度，通过在基线和两周后完成该工具的 28 名参与者之间的组内相关系数评估外部信度。
通过对最初的 151 个项目进行的面部和内容效度评估，删除了 61 个项目。对参与的营养师进行的经过修订的 90 个项目问卷进行了心理测量测试，得到了最终的 46 个项目问卷。通过 PCA 与方差极大旋转提取了 6 个因子，解释了总方差的 59.2%。部分验证性因子分析显示出可接受的模型拟合度（χ2/df=2.11，CFI=0.97，TLI=0.96，RMSEA=0.08，SRMR=0.05）。在具有不同 IBS 经验水平的营养师中，总分存在显著差异。每个因素的内部信度均>0.7。每个因素的外部信度均>0.6，每个领域的总分均>0.7。
已开发出一种经过验证的问卷，可用于实践和研究中，以评估 IBS 饮食管理的知识、态度和实践。
