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. 2024 May 7;16:26. doi: 10.1186/s13099-024-00619-7

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Alpha-diversity comparison based on Chao and Shannon indices according to bile reflux gradings, pathological gradings, H. pylori infection, and sex. (A) Bile reflux gradings, (B) pathological gradings, (C) presence/absence of H. pylori, and (D) sex. Grade 0: no bile reflux; grade 1: light-yellow-clear fluid in the stomach; grade 2, yellowish green fluid in the stomach; LGD, low-grade dysplasia; EGC, early gastric cancer; H. pylori, Helicobacter pylori