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To summarize worldwide data on the incidence and prevalence of inflammatory bowel disease (IBD) — which comprises ulcerative colitis (UC) and Crohn disease (CD) — researchers systematically reviewed 238 incidence and 122 prevalence studies. The highest percentage of studies came from Europe, the second highest from Asia and the Middle East, and the third highest from North America.
Incidence rates of IBD were highest in Europe and North America, with lower rates in Asia and the Middle East. Incidence did not differ by sex but did differ by age, with the highest rates among 20- to 29-year-olds. Among studies with at least 10 years of data that tracked incidence over time, 75% showed increasing incidence of CD, and 60% showed increasing incide…