Abstract Background For patients with inflammatory bowel diseases (IBD), the ultimate goal is to live a ‘normal life’, yet no validated patient-reported outcome measure (PROM) exists to assess this. We aimed to develop and validate a globally relevant PROM to assess the impact of IBD on normal life through a world-wide, patient-centred approach, the ‘IBD LIFE’. Methods Patients with Crohn’s disease (CD) or ulcerative colitis (UC) from Argentina, Australia, India, the Netherlands, South Korea, and the USA without ostomies, pouches, or significant comorbidities were eligible. The development phase involved (A) patient interviews, (B) a Delphi consensus, (C) patient focus groups, (D) pilot-testing, and (E) cross-cultural translation, resulting in a 23-item PROM with five domains: physical, activities, social, psychological, and circumstances. For the validation phase, CD and UC patients speaking Dutch, English, and Spanish were recruited (n=100 per disease, per language). IBD LIFE and generic and IBD-specific quality of life (QoL) PROMs ((Short-From-36 (SF-36) and IBD Questionnaire (IBDQ)) were administered at baseline, 2 weeks (n=30 per language) and ≥8 weeks. Clinical disease activity was measured at baseline and ≥8 weeks using Harvey Bradshaw Index (HBI) for CD and Simple Clinical Colitis Activity Index (SCCAI) for UC. Construct validity was tested through correlations between baseline indices, repeatability using intraclass correlation coefficient (ICC) in patients with stable QoL at 2 weeks, and responsiveness through a Receiver Operating Characteristic curve analysis for detection of a clinically meaningful change in IBDQ at ≥8 weeks. Country-specific normal life impairment patterns were assessed using total IBD LIFE scores and domain weights. Results Among 605 patients (300 CD/305 UC, table 1), IBD LIFE’s construct validity was supported by strong correlations with QoL indices (IBDQ r=-0.90; SF-36 r=-0.83), and moderate correlations with clinical disease indices (HBI r=0.52; SCCAI r=0.51). IBD LIFE showed strong repeatability (ICC=0.91) and responsiveness (AUC=0.873). IBD LIFE scores ranged from 0-90 (mean 18.51 ± 18.73), with higher scores being associated with more impairment on normal life. Physical and psychological domains had most impact on patients’ lives (indicated by highest domain weights, figure 1). USA patients had the lowest IBD LIFE score compared to other countries (mean 12.27 ± 14.20; P<0.001), yet showed disproportionately higher impact in the physical domain and lower impact in activities (Figure 1). Conclusion IBD LIFE, developed with extensive patient involvement, is a valid PROM of IBD’s impact on normal life. It allows tailored patient support to achieve normal life across all life domains affected by IBD.
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