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. 2020 Jul 14;10:11599. doi: 10.1038/s41598-020-68398-0

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Patient statistics according to the sub-classification criteria for pre-renal and renal AKI. Cr_p, plasma creatinine; Cr_u, urinary creatinine; FENa, fractional excretion of sodium; RFI, renal failure index. (b) AKI etiologies in the whole AKI population and in the subpopulation of patients who recovered from AKI and in the subpopulation of patients who did not recover.