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. 2021 Jul 20;4:113. doi: 10.1038/s41746-021-00482-9

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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 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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Fig. 5 — Confusion matrix for the predictions of the test sets based on the optimal decision threshold based on the Youden’s J statistic. True refers to entering critical state, and False refers to not entering critical state. The shades of the confusion matrix correspond to the median percentage of the actual labels (i.e., shade of the top left cell and the bottom right cell represent the median specificity and the median sensitivity, respectively).