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Point Prevalence of Pediatric Inflammatory Bowel Disease in New Zealand in 2015: Initial Results from the PINZ Study

Lopez, Robert N. MMedSc*; Evans, Helen M. MBChB; Appleton, Laura MSc*; Bishop, Jonathan MBChB; Chin, Simon MBChB; Mouat, Stephen MBChB; Gearry, Richard B. PhD; Day, Andrew S. MD*

doi: 10.1097/MIB.0000000000001138
Original Clinical Articles

Background: The incidence of pediatric inflammatory bowel disease (IBD) around the world is increasing. However, there is a scarcity of data on the epidemiology of pediatric IBD in the Southern Hemisphere. This study aimed to document the point prevalence of pediatric IBD in New Zealand on June 30, 2015.

Methods: All patients in New Zealand, under 16 years of age, with a diagnosis of IBD on June 30, 2015 were identified. Demographic and disease phenotypic details were collected and entered into a secure database. Age-specific population data for New Zealand were obtained and national and regional prevalence rates were calculated.

Results: The point prevalence of pediatric IBD, Crohn's disease, ulcerative colitis, and inflammatory bowel disease unclassified in New Zealand on June 30, 2015 was (95% confidence intervals) 21.7 (18.9–24.8), 16.5 (14.0–19.2), 3.3 (2.2–4.6), and 1.9 (1.2–3.0) per 100,000 children, respectively. There was a striking disparity between the prevalence rates in the North and South Islands.

Conclusions: The point prevalence of pediatric IBD in New Zealand represents the first-ever national, population-based prevalence rates of pediatric IBD published. Results from the Paediatric IBD in New Zealand (PINZ) study are also the first to show markedly higher prevalence rates of IBD in the southern part of a country compared with its northern counterpart. Ongoing prospective ascertainment of the incidence of pediatric IBD is required.

Article first published online 24 May 2017.Supplemental Digital Content is Available in the Text.

*Department of Paediatrics, University of Otago, Christchurch, Christchurch, New Zealand;

Department of Paediatric Gastroenterology, Starship Children's Hospital, Auckland, New Zealand; and

Department of Medicine, University of Otago, Christchurch, Christchurch, New Zealand.

Address correspondence to: Robert N. Lopez, MBChB, MMedSc (Dist), Department of Gastroenterology, Sydney Children's Hospital, High Street, Randwick NSW 2031, Sydney, Australia (e-mail:

Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (

R. N. Lopez was the recipient of a Freemasons Postgraduate Fellowship in Paediatrics and Child Health. The remaining authors have no conflict of interest to disclose.

Received February 16, 2017

Accepted March 29, 2017

© Crohn's & Colitis Foundation
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