Development and Validation of the TUMMY-UC: A Patient-Reported Outcome for Pediatric Ulcerative Colitis

Liron Marcovitch, Gili Focht, Natalie Carmon, Claudia Tersigni, Oren Ledder, Raffi Lev-Tzion, Peter C. Church, Jeffrey S. Hyams, Robert N. Baldassano, Athos Bousvaros, David R. Mack, Séamus Hussey, Anthony Otley, Nicholas M. Croft, Michael D. Kappelman, Anne M. Griffiths, Dan Turner*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Background & Aims: The TUMMY-UC is a patient-reported outcome measure for pediatric ulcerative colitis (UC) with an observer-reported outcome version for children aged <8 years. It includes eight items selected by concept elicitation interviews. We aimed to finalize the TUMMY-UC by cognitive interviews (stage 2) and to evaluate the index for its psychometric properties (stage 3). Methods: The TUMMY-UC items were first finalized during 129 cognitive debriefing interviews. Then, in a prospective, multicenter validation study, 84 children who underwent colonoscopy or provided stool for calprotectin completed the TUMMY-UC and various measures of disease activity. Assessments were repeated after 7 and 21 days for evaluating reliability and responsiveness. Results: During stage 2, the items were formatted with identical structure to ensure conceptual equivalence and weighted based on ranking of importance. In stage 3, the TUMMY-UC total score had excellent reliability in repeated assessments (intraclass correlation coefficient, 0.90; 95% confidence interval, 0.84–0.94). It also had moderate to strong correlations with all constructs of disease activity: r = 0.70 with UC endoscopic index of severity, r = 0.63 with the IMPACT-III questionnaire, r = 0.43 with calprotectin, r = 0.80 with the Pediatric Ulcerative Colitis Activity Index, r = 0.75 with global assessment of disease activity, and r = 0.46 with C-reactive protein (all P < .015). The index had excellent discrimination of disease activity, with a score of <9 defining remission (area under the receiver operating characteristic curve, 0.95; 95% confidence interval, 0.93–0.99). The ΔTUMMY-UC showed high responsiveness and differentiated well between children who experienced changed from those with no change. Conclusions: The TUMMY-UC, constructed from patient-reported outcome and observer-reported outcome versions, is a reliable, valid and responsive index that can be now used in practice and clinical trials.

Original languageAmerican English
Pages (from-to)610-618.e4
JournalGastroenterology
Volume164
Issue number4
DOIs
StatePublished - Apr 2023

Bibliographical note

Publisher Copyright:
© 2023 AGA Institute

Keywords

  • ObsRO
  • PRO
  • PUCAI Scale
  • Patient-Reported Outcome
  • Ulcerative Colitis

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