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. 2021 Nov 27;21:267. doi: 10.1186/s12874-021-01441-4

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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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Mean predicted probability versus the observed event rate over 10 predicted probability groups between 0 and 1 at an increment of 0.1 for the scenario without hospital use for COVID-19 as predictors. The black line at 45 degree represents a line of perfect calibration. The grey lines are the linear regression lines for modelling the observed event rate against the mean predicted probabilities over the 10 groups as predictor