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. 2023 Dec 5;23:487. doi: 10.1186/s12890-023-02798-6

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© The Author(s) 2023

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. 3 — Comparison of changes in FEV₁% predicted from baseline in HRV-positive patients. Eighteen HRV-positive patients underwent a PFT 3 months after exacerbations, and FEV₁% predicted from baseline was compared with the treatment period of systemic corticosteroids (3–5 days, n = 8; 6–8 days, n = 10). Values are expressed as the median with an interquartile range. Differences in data were analyzed by the Mann–Whitney U-test. FEV₁, forced expiratory volume in 1 second