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. 2022 Dec 9;22:950. doi: 10.1186/s12877-022-03659-3

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© The Author(s) 2022

Open AccessThis 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. 4 — Cubic spline showing odds ratio or difference in length of stay stratified by kidney function. a Association between BMI and the risk of in-hospital mortality in patients with CKD stage G3 after multivariable adjustment. b Association between BMI and the risk of in-hospital mortality in patients with CKD stage G4 after multivariable adjustment. c Association between BMI and the risk of in-hospital mortality in patients with CKD stage G5 after multivariable adjustment. d Association between BMI and difference in length of stay (days) in patients with CKD stage G3 after multivariable adjustment. e Association between BMI and difference in length of stay (days) in patients with CKD stage G4 after multivariable adjustment. f Association between BMI and difference in the length of stay (days) in patients with CKD stage G5 after multivariable adjustment. CKD G3, chronic kidney disease stage G3; CKD G4, chronic kidney disease stage G4; CKD G5, chronic kidney disease stage G5