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. 2023 Sep 12;18:673. doi: 10.1186/s13018-023-04157-x

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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. 1 — The bar graph displays the distribution of NLR, PLR, and SII values between the non-POP group (n = 1008) and the POP group (n = 111). a The NLR values in the POP group were higher than in the non-POP group (p < 0.001). b The PLR values in the POP group were higher than in the non-POP group (p = 0.02). c The SII values in the POP group were higher than in the non-POP group (p < 0.001). NLR refers to neutrophil-to-lymphocyte ratio; PLR refers to platelet-to-lymphocyte ratio; SII refers to systemic immune-inflammation index; POP refers to postoperative pneumonia; Non-POP refers to non-postoperative pneumonia