Incidence and phenotype of inflammatory bowel disease based on results from the Asia-pacific Crohn's and colitis epidemiology study.


BACKGROUND & AIMS Inflammatory bowel diseases (IBD) are becoming more common in Asia, but epidemiologic data are lacking. The Asia-Pacific Crohn's and Colitis Epidemiology Study aimed to determine the incidence and phenotype of IBD in 8 countries across Asia and in Australia. METHODS We performed a prospective, population-based study of IBD incidence in predefined catchment areas, collecting data for 1 year, starting on April 1, 2011. New cases were ascertained from multiple overlapping sources and entered into a Web-based database. Cases were confirmed using standard criteria. Local endoscopy, pathology, and pharmacy records were searched to ensure completeness of case capture. RESULTS We identified 419 new cases of IBD (232 of ulcerative colitis [UC], 166 of Crohn's disease [CD], and 21 IBD-undetermined). The crude annual overall incidence values per 100,000 individuals were 1.37 for IBD in Asia (95% confidence interval: 1.25-1.51; 0.76 for UC, 0.54 for CD, and 0.07 for IBD-undetermined) and 23.67 in Australia (95% confidence interval: 18.46-29.85; 7.33 for UC, 14.00 for CD, and 2.33 for IBD-undetermined). China had the highest incidence of IBD in Asia (3.44 per 100,000 individuals). The ratios of UC to CD were 2.0 in Asia and 0.5 in Australia. Median time from symptom onset to diagnosis was 5.5 months (interquartile range, 1.4-15 months). Complicated CD (stricturing, penetrating, or perianal disease) was more common in Asia than Australia (52% vs 24%; P = .001), and a family history of IBD was less common in Asia (3% vs 17%; P < .001). CONCLUSIONS We performed a large-scale population-based study and found that although the incidence of IBD varies throughout Asia, it is still lower than in the West. IBD can be as severe or more severe in Asia than in the West. The emergence of IBD in Asia will result in the need for specific health care resources, and offers a unique opportunity to study etiologic factors in developing nations.

DOI: 10.1053/j.gastro.2013.04.007
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@article{Ng2013IncidenceAP, title={Incidence and phenotype of inflammatory bowel disease based on results from the Asia-pacific Crohn's and colitis epidemiology study.}, author={Siew C Ng and Whitney Tang and Jessica Y Ching and May Wong and Chung Mo Chow and A J Hui and T C Wong and Vincent K Leung and Steve W Tsang and Hon Ho Yu and Mo Fong Li and Ka Kei Ng and Michael A Kamm and Corrie Studd and Sally Bell and Rupert Leong and H Janaka de Silva and Anuradhani Kasturiratne and M N F Mufeena and Khoon Lin Ling and Choon Jin Ooi and Poh Seng Tan and David Ong and Khean L Goh and Ida Hilmi and Pises Pisespongsa and Sathaporn Manatsathit and Rungsun Rerknimitr and Satimai Aniwan and Yu Fang Wang and Qin Ouyang and Zhirong Zeng and Zhenhua Zhu and Min Hu Chen and Pin Jin Hu and Kaichun Wu and Xin Wang and Marcellus Simadibrata and Murdani Abdullah and Justin Cy Wu and Joseph J Y Sung and Francis K L Chan}, journal={Gastroenterology}, year={2013}, volume={145 1}, pages={158-165.e2} }