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. 2024 Jan 2;14:47. doi: 10.1038/s41598-023-49210-1

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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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Risk factors for ICU admission; Comparison of three subsets: all patients (CW 1, 2020 to CW 48, 2022), pre-Omicron (CW 1, 2020 to CW 51, 2021) and Omicron (CW 52, 2021 to CW 48, 2022). Only symptomatic patients were included (N = 6512 out of 7375 total). To test a two-sided hypothesis, variables were analyzed in a fully-adjusted Poisson regression model with a 95% confidence interval (CI) and significance level of 0.05.