{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T22:38:34Z","timestamp":1790289514842,"version":"4.1.0"},"reference-count":22,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2023,3,27]],"date-time":"2023-03-27T00:00:00Z","timestamp":1679875200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Internal Medicine Journal"],"published-print":{"date-parts":[[2023,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background and Aims<\/jats:title><jats:p>Inflammatory bowel disease (IBD) prevalence is rising globally; however, indigenous groups are underrepresented. Waikato, New Zealand, is a large region with a high proportion of M\u0101ori patients. In Canterbury in 2006, 1% of patients with IBD were M\u0101ori. We investigated the incidence and prevalence of IBD in Waikato over 10\u2009years.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This was a retrospective cohort study assessing the incidence and prevalence of IBD between 2009 and 2019. The search strategy included pathology, radiology, Provation, <jats:italic>ICD\u201010<\/jats:italic> coding and private clinics, using the keywords: Crohn's, Crohn, ileitis, colitis, ulcerative, inflammatory bowel disease and IBD. Collected data included current age and age at diagnosis, sex, ethnicity and IBD subtype.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The IBD point prevalence on 31 December 2019 was 375.6\/100 000 compared with 293.6\/100 000 in 2010, increasing by 27.9%. The annualised incidence was static from 21.5\/100 000 in 2010 to 17.5\/100 000 in 2019. Female patients comprised 53.3% of the cohort. Ulcerative colitis (UC) made up 54.2% of cases, 43.8% had Crohn disease (CD) and 2.0% had indeterminate colitis. Sixty (3.7%) patients identified as M\u0101ori. In non\u2010M\u0101ori patients, the average age at diagnosis was 36.2\u2009years, compared with 33.0\u2009years in M\u0101ori patients (<jats:italic>P<\/jats:italic> =\u20090.11). In M\u0101ori patients, 53.3% had UC and 45.0% had CD. Thirty\u2010five percent of M\u0101ori patients lived 50 km or more from base hospital, compared with 41% of non\u2010M\u0101ori patients (<jats:italic>P<\/jats:italic> =\u20090.33).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>IBD prevalence has increased substantially; however, the incidence has remained static. M\u0101ori IBD rates are higher than previously reported, in keeping with international indigenous trends. M\u0101ori patients were diagnosed at a similar age as non\u2010M\u0101ori patients, with similar disease subtypes.<\/jats:p><\/jats:sec>","DOI":"10.1111\/imj.16072","type":"journal-article","created":{"date-parts":[[2023,3,14]],"date-time":"2023-03-14T07:45:30Z","timestamp":1678779930000},"page":"2307-2312","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Inflammatory bowel disease in Waikato, New Zealand: incidence and prevalence"],"prefix":"10.1111","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1913-6090","authenticated-orcid":false,"given":"Samir","family":"Seleq","sequence":"first","affiliation":[{"name":"Waikato District Health Board  Hamilton Waikato New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank","family":"Weilert","sequence":"additional","affiliation":[{"name":"Waikato District Health Board  Hamilton Waikato New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1884-2401","authenticated-orcid":false,"given":"James","family":"Fulforth","sequence":"additional","affiliation":[{"name":"Waikato District Health Board  Hamilton Waikato New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,3,27]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1136\/gutjnl-2013-304636"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0016-5085(17)33292-4"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1136\/gutjnl-2019-318936"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1093\/jcag\/gwy054"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/nrgastro.2015.150"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41575-020-00360-x"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1097\/01.mib.0000231572.88806.b9"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1097\/MIB.0000000000000829"},{"key":"e_1_2_8_10_1","first-page":"1981","volume-title":"Decades of Disparity III: Ethnic and Socioeconomic Inequalities in Mortality","author":"Ministry of Health and University of Otago","year":"2006"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1445-5994.1982.tb02443.x"},{"key":"e_1_2_8_12_1","volume-title":"Provation [Computer Program]","author":"Provation Software Group","year":"2020"},{"key":"e_1_2_8_13_1","unstructured":"Stats NZ [Internet]. 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