Validation of the inflammatory bowel disease disability index for self-report and development of an item-reduced version

Emma Paulides*, Catherine Kim, Chris Frampton, Richard B. Gearry, Tim Eglinton, Rupert W. Leong, Nanne K. H. de Boer, Chris J. J. Mulder, Andrew M. McCombie

*Corresponding author for this work

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Abstract

Background and Aim: The Inflammatory Bowel Disease Disability Index (IBD-DI) is a measure of disability in inflammatory bowel disease (IBD). The IBD-DI is validated for use as a clinical interview but not for use as a self-report questionnaire. We aimed to validate the IBD-DI for self-report (IBD-DI-SR) and to reduce the number of items, using IBD patients from two centers. Methods: Between April and August 2017, ambulatory IBD patients were recruited from Christchurch Hospital, New Zealand and Concord Hospital, Australia. The IBD-DI clinical interview version was compared with a self-report version. Participants were randomized to do the clinical interview or self-report first. Validation of the IBD-DI-SR involved calculating the correlation coefficient between the clinician completed and self-reported version of the IBD-DI and Cronbach's α of internal consistency of the IBD-DI-SR. To create an item-reduced version, multiple linear regression was used. The R2 of the model described the overall association between the item-reduced IBD-DI-SR and the IBD-DI. Results: One hundred fourteen patients (57 from Christchurch and 57 from Sydney) completed the IBD-DI-SR validation phase, of whom 63 had Crohn's disease and 51 had ulcerative colitis. The Pearson correlation coefficient between the IBD-DI-SR and IBD-DI is 0.90 (P < 0.001), and Cronbach's α of the IBD-DI-SR was 0.86. The item-reduced version of the IBD-DI-SR consisted of eight questions instead of 28, explaining 77% of the variance. Conclusions: The IBD-DI-SR has demonstrated reliability and validity. The item-reduced IBD-DI-SR is a concise self-report instrument for measuring IBD disability, which makes the IBD-DI more widely usable.

Original languageEnglish
Pages (from-to)92-102
Number of pages11
JournalJournal of Gastroenterology and Hepatology (Australia)
Volume34
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019
Externally publishedYes

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Keywords

  • Crohn's disease
  • disability, self-report
  • inflammatory bowel disease
  • ulcerative colitis

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