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. 2021 Aug 2;11:15591. doi: 10.1038/s41598-021-95004-8

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© The Author(s) 2021

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/.

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Feature importance for older and younger patients. Each point represents a feature in the SIVEP-Gripe dataset, and the axes show the relative importance for COVID-19 mortality prediction for older ( $\geq$ 60 years, x axis) and younger ( $< 60$ years, y axis) hospitalized patients. Variables deviating from the dotted identity line suggests a different relative importance for the groups. The coloring marks the categories listed in Fig. 1.