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. 2021 Sep 23;155:104594. doi: 10.1016/j.ijmedinf.2021.104594

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© 2021 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 6 — Performance Flow Chart for the Test Assessing Risk of Intubation for (A) the Development Cohort and (B) the Validation Cohort. Each uncolored box represents a classifier with the contents reflecting the set of patients to be classified by the classifier. The colored boxes represent the final risk groups with the contents reflecting composition of the groups and test performance. Bootstrap 95% confidence intervals for performance metrics are given in the supplement. Pos = Positive (Intubated); Neg = Negative (Not intubated), PPV = Positive Predictive Value.