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. 2021 Sep 22;11:18844. doi: 10.1038/s41598-021-98308-x

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© The Author(s) 2021

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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Cumulative incidence of death for all patients (top), patients stratified by sex (middle), and patients stratified by age (bottom) in Aragon, Spain, February-September 2020. By sex: purple indicates men, green indicates women. By age: green indicates 0–60 years, red 60–80 years, and blue > 80 years. Solid lines: first wave; dashed lines: second wave. The p-values corresponds to the Gray test to compare survival curves between waves for groups stratified by sex or age.