Compounding Prevalence of Inflammatory Bowel Disease in a 2024 Population-Based Study From Canterbury, New Zealand

IF 1.7 Q3 GASTROENTEROLOGY & HEPATOLOGY

JGH Open Pub Date : 2025-05-30 DOI:10.1002/jgh3.70192

Angela J. Forbes, Andrew S. Day, Chris M. A. Frampton, Richard B. Gearry

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Abstract

Background and Aim

The epidemiological patterns of inflammatory bowel disease (IBD) can give insights into disease etiology and health system burden. This study aimed to measure the population-based prevalence in Canterbury and consider the region's position within the 4-stage epidemiological model of IBD.

Methods

Gastroenterology clinics in Canterbury were searched for patients with a confirmed diagnosis of IBD. Demographic and disease details (including Montreal phenotype) were extracted from individual medical records. The prevalence of IBD, Crohn's disease (CD), ulcerative colitis (UC) and inflammatory bowel disease unclassified (IBDU) was established for the total population and for age, sex, and ethnic sub-groups.

Results

Altogether 4042 individuals (1 in 150 people) in Canterbury with IBD were identified. The point prevalence of IBD on 1st January 2024 was 671 (95% CI 651–692) per 100 000 persons. The prevalence of CD 386 (95% CI 370–402) was higher than UC 264 (95% CI 251–277) each per 100 000. Almost three times as many individuals had IBD in 2024, compared to a 2005 study. The majority of the cohort were New Zealand European (92.9%) followed by Māori (4.2%), Asian (2.6%) and Pacific peoples (0.3%). Older adults (65+ years) comprised 21% of the population with a prevalence of 845 (95% CI 789–904) per 100 000 persons.

Conclusion

Canterbury has the highest reported prevalence of IBD in Oceania to date, and there is a growing proportion of older age patients. The rapid rise in cases supports the hypothesis that Canterbury is in the compounding prevalence stage of the epidemiological model of IBD.

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在新西兰坎特伯雷的一项基于2024年人群的研究中，炎症性肠病的复合患病率

背景与目的了解炎症性肠病（IBD）的流行病学特征有助于了解疾病病因和卫生系统负担。本研究旨在测量坎特伯雷以人群为基础的患病率，并考虑该地区在IBD 4阶段流行病学模型中的地位。方法检索坎特伯雷胃肠科门诊确诊的IBD患者。从个人病历中提取人口统计学和疾病细节（包括蒙特利尔表型）。确定了IBD、克罗恩病（CD）、溃疡性结肠炎（UC）和未分类炎症性肠病（IBDU）在总人口、年龄、性别和种族亚组中的患病率。结果坎特伯雷共有4042人（150人中有1人）患有IBD。2024年1月1日IBD的点患病率为每10万人671例（95% CI 651-692）。每10万人中CD 386 （95% CI 370-402）的患病率高于UC 264 （95% CI 251-277）。与2005年的研究相比，2024年患IBD的人数几乎增加了三倍。大多数队列是新西兰欧洲人（92.9%），其次是Māori(4.2%)，亚洲人（2.6%）和太平洋人（0.3%）。老年人（65岁以上）占人口的21%，患病率为每10万人845例（95% CI 789-904）。结论迄今为止，坎特伯雷是大洋洲报告的IBD患病率最高的地区，而且老年患者的比例越来越大。病例的快速增加支持了坎特伯雷处于IBD流行病学模型复合流行阶段的假设。

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