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Identification of a Latitude Gradient in the Prevalence of Primary Biliary Cholangitis

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French, J, Simpson-Yap, S ORCID: 0000-0001-6521-3056, van der Mei, I ORCID: 0000-0001-9009-7472, Ng, J, Angus, P and Gow, PJ 2021 , 'Identification of a Latitude Gradient in the Prevalence of Primary Biliary Cholangitis' , Clinical and Translational Gastroenterology, vol. 12, no. 5 , e00357 , doi: 10.14309/ctg.0000000000000357.

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Abstract

Introduction: The prevalence of primary biliary cholangitis (PBC) reported in different countries varies significantly and seems to have a latitudinal gradient with the highest prevalence reported in higher latitudes, as has been observed with other autoimmune diseases. This study aimed to determine whether there is a latitudinal gradient of PBC prevalence in Australia using 2 methods of case ascertainment.Methods: We investigated the latitudinal variation of PBC prevalence across the states and territories of Australia (latitudinal range 18.0°-42.7°S) using pathology-based (private pathology antimitochondrial antibody results and PBC-specific prescription databases (prescriptions for ursodeoxycholic acid, the only publicly subsidized treatment for this disease).Results: PBC prevalence was significantly positively associated with latitude, and the postcodes in the highest quintile of latitude (encompassing the south coastal areas of the Australian mainland and Tasmania; latitude range -37.75° to -42.72°) had a prevalence estimate that was 1.78 times higher using the pathology-based prevalence estimation than those in the lowest quintile (encompassing tropical and southern Queensland; latitude range -18.02° to -27.59°). Comparing prevalence estimates between states/territories, the result was 2.53 and 2.21 times higher in Tasmania compared with Queensland when using the pathology-based and prescription-based methods, respectively.Discussion: Using 2 different case-ascertainment methods, we have demonstrated that prevalence estimates of PBC vary significantly with latitude in Australia. Further studies are needed to determine whether factors such as variations in ultraviolet radiation exposure and/or vitamin D levels are responsible for this observation and to investigate the latitudinal prevalence of PBC in other populations.

Item Type: Article
Authors/Creators:French, J and Simpson-Yap, S and van der Mei, I and Ng, J and Angus, P and Gow, PJ
Journal or Publication Title: Clinical and Translational Gastroenterology
Publisher: Wolters Kluwer Health
ISSN: 2155-384X
DOI / ID Number: 10.14309/ctg.0000000000000357
Copyright Information:

© 2021 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of The American College of Gastroenterology. This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CC BY-NC-ND), (https://creativecommons.org/licenses/by-nc-nd/4.0/) where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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