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. 2023 Jan 9;13:442. doi: 10.1038/s41598-022-27342-0

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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/.

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Time to event analysis of oxygen support using SpO2 CT93 and median measured during the first recorded hour. (a) Kaplan–Meier analysis of CT93 stratified as low (0–30), medium (30–60), and high (60–100) CT93. (b) Cox proportional hazards model summary, including stratified CT93, age, and sex. CT93 represents the fraction of time (in %) under the 93% SpO2 threshold. (c) Kaplan–Meier analysis of median stratified as bellow 90%, between 90 and 93% and above 93%. (d) Cox proportional hazards model summary, including stratified median, age, and sex.