Journal Article

P354 Refinement and confirmation of psychometric properties of the Inflammatory Bowel Disease Distress Scale (IBD-DS): A new tool to measure disease-specific distress

L Dibley, W Czuber-Dochan, S Woodward, T Wade, P Bassett, J Sturt and C Norton

in Journal of Crohn's and Colitis

Published on behalf of European Crohn's and Colitis Organisation

Volume 12, issue supplement_1, pages S282-S283
Published in print January 2018 | ISSN: 1873-9946
Published online January 2018 | e-ISSN: 1876-4479 | DOI: https://dx.doi.org/10.1093/ecco-jcc/jjx180.481
P354 Refinement and confirmation of psychometric properties of the Inflammatory Bowel Disease Distress Scale (IBD-DS): A new tool to measure disease-specific distress

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Abstract

Background

We previously reported initial development and psychometric properties of the Inflammatory Bowel Disease Distress Scale (IBD-DS),1 guided by recommended procedures.2,3 Statistical analysis following test–retest indicated considerable item reduction was possible, reducing the length of the questionnaire by 50%. A further validation round to confirm construct validity and reliability (repeatability) of the scale, and identify any domains within the newly reduced draft scale, was therefore indicated.

Methods

We recruited a cohort of community-dwelling patients with IBD via the social media platforms and the website of a UK-based IBD charity. Participants received the revised shorter IBD-DS, the relevant disease activity index (Harvey Bradshaw Index [HBI]) for CD, Simple Clinical Colitis Activity Index [SCCAI]) for UC, and the Hospital Anxiety and Depression Score (HADS) on two occasions, approximately 2 weeks apart. Internal consistency was assessed using Cronbach’s alpha; intra-class correlation was used to examine repeatability. Factor analysis with varimax rotation was used to assess domains within the scale.

Results

209 people volunteered to receive the 28-item IBD-DS; 123 (58.8%) returned the test round, and 95 (77%) returned the retest round. Higher IBD-DS values were associated with higher values on the HBI, SCCAI, and HADS (all p < 0.001). Cronbach’s alpha was 0.95. Ninety-five participants had complete data and stable disease. An ICC value of 0.92 (95% CI, 0.88, 0.95) indicated fairly good to excellent agreement between test and retest values. Factor analysis identified four domains; one explained almost half of all variation in the data, indicating that a single domain with an overall score (range 0–168, plus three supplementary unscored items) is appropriate.

Conclusions

The IBD-DS performs well psychometrically. It offers a useful clinical and research tool for assessing IBD distress. Further testing, to include responsiveness to change, relationship with self-management activity such as drug concordance, and determining cut-off points, is needed.

References

1. Dibley L, Czuber-Dochan W, Woodward S, et al. Distress in IBD: development of a new assessment tool, 11th Congress of ECCO, Amsterdam, The Netherlands, 15–19 March 2016.

2. Centre for Drug Evaluation and Research. Guidance for industry. Patient reported outcome measures: use in medical product development to support labelling claims. 2009. https://www.fda.gov/downloads/drugs/guidances/ucm193282.pdf 2017-01-01

3. Rothrock N, Kaiser K, Cella D. Developing a valid patient-reported outcome measure. Clin Pharmacol Ther, 2011;90:737–42

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Subjects: Medicine and Health ; Clinical Medicine ; Gastroenterology ; Gastro-intestinal and Colorectal Surgery ; Health, Illness, and Medicine

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