{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,12]],"date-time":"2026-02-12T10:23:04Z","timestamp":1770891784725,"version":"3.50.1"},"reference-count":29,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T00:00:00Z","timestamp":1765584000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T00:00:00Z","timestamp":1765584000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Internal Medicine Journal"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>The epidemiology of inflammatory bowel disease (IBD) in New Zealand (NZ) has been explored in regional studies but not at a national level. This study aimed to use administrative data to define the first nationwide IBD population and estimate the incidence, prevalence and mortality of IBD in NZ.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>The Integrated Data Infrastructure (IDI) is a statistical database linking population\u2010level health data. An IBD population was created within the IDI using hospital discharge information by International Classification of Diseases, Tenth Revision code. Incidence and prevalence rates were calculated for 16\u2009years (2006\/07\u20132021\/22) by age, sex, ethnicity and urban\/rural location. Age\u2010sex\u2010standardised mortality was measured annually from 2012 to 2022.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Between 1 July 2021 and June 30 2022, 19\u2009566 people in the IDI were identified as having IBD, giving a prevalence of 391.4 (95% confidence interval (CI) 386.0\u2013396.9) per 100\u2009000 people. The prevalence of Crohn's disease (CD), 206.9 (95% CI 203.0\u2013211.0), was similar to that of ulcerative colitis (UC), 213.2 (95% CI 209.2\u2013217.2), both per 100\u2009000 people. In the same year, 1407 new cases of IBD were observed, giving an incidence rate of 28.1 (95% CI 26.7\u201329.7) per 100\u2009000 person\u2010years. The 2012\u20132022 standardised mortality ratio for IBD was 1.69 (95% CI 1.60\u20131.79).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>A high incidence and prevalence of IBD were seen in NZ, and increased all\u2010cause mortality rates were observed. Despite the limitations of using hospital data, this work established the value of IDI data for IBD epidemiological studies and produced national estimates of IBD burden.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/imj.70291","type":"journal-article","created":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T11:55:06Z","timestamp":1765626906000},"page":"229-237","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Incidence, prevalence and mortality of inflammatory bowel disease in New Zealand 2006\u20132022 using hospital information in the Integrated Data Infrastructure (\n                    <scp>IDI<\/scp>\n                    )"],"prefix":"10.1111","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0186-5877","authenticated-orcid":false,"given":"Angela J.","family":"Forbes","sequence":"first","affiliation":[{"name":"Department of Medicine University of Otago Christchurch  Christchurch New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9708-8816","authenticated-orcid":false,"given":"Sheree J.","family":"Gibb","sequence":"additional","affiliation":[{"name":"Southern Research and Analytics Ltd  New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4589-9956","authenticated-orcid":false,"given":"Nicholas","family":"Bowden","sequence":"additional","affiliation":[{"name":"Southern Research and Analytics Ltd  New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2290-7386","authenticated-orcid":false,"given":"Andrew S.","family":"Day","sequence":"additional","affiliation":[{"name":"Department of Paediatrics and Child Health University of Otago Christchurch  Christchurch New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0603-5661","authenticated-orcid":false,"given":"Chris M. A.","family":"Frampton","sequence":"additional","affiliation":[{"name":"Department of Medicine University of Otago Christchurch  Christchurch New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2298-5141","authenticated-orcid":false,"given":"Richard B.","family":"Gearry","sequence":"additional","affiliation":[{"name":"Department of Medicine University of Otago Christchurch  Christchurch New 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