TRENDS IN THE ULCERATIVE COLITIS TO CROHN'S DISEASE INCIDENCE RATIO ARE DISTINCT BETWEEN EPIDEMIOLOGIC STAGES OF INFLAMMATORY BOWEL DISEASE.

Windsor, Joseph W; Coward, Stephanie; Hracs, Lindsay; Mak, Joyce W Y; Banerjee, Rupa; Kotze, Paulo G; Gearry, Richard; Ng, Siew C et al. · Am J Gastroenterol · 2025

retrospective_cohort · Level III

Where this comes from

Abstract

The ulcerative colitis (UC) to Crohn's disease (CD) incidence ratio varies across geography and time. We analyzed UC:CD incidence ratios across three epidemiologic stages using generalized additive models for location, shape, and scale and pooled average annual percent changes (AAPCs) by meta-analysis. Ratios significantly decreased: median 3.62 in stage 1, 1.82 in stage 2, 1.55 in stage 3; the incidence ratio stabilized in stage 3 (AAPC: -0.12; 95%CI: -0.66, 0.42). Decreasing UC:CD incidence ratios signal a rising burden of CD, underscoring the need to anticipate greater healthcare demand, including higher treatment costs and higher prevalence of complications.