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. 2021 Sep 8;8:695195. doi: 10.3389/fmed.2021.695195

Figure 1.

Figure 1

Receiver operating characteristic curve analysis showing the prognostic value of age (A), Charlson Comorbidity Index (B), and chest computed tomography severity score (C) in the discriminative performance for severe/critical disease. (A) The cut-off value of 68.9 years predicts a severe/critical disease with 94.6% sensitivity and 68.1% specificity. The AUC-ROC is 0.836 (95% CI 0.785–0.896), the Youden index 0.627; (B) the cut-off value of 3 at Charlson Comorbidity Index predicts a severe/critical outcome with 83.8% sensitivity and 69.6% specificity. The AUC-ROC curve is 0.854 (95% CI 0.792–0.903), the Youden index 0.534; (C) the cut-off value of 53 at computed tomography severity score predicts a severe/critical outcome with 64.9% sensitivity and 84.4% specificity. The AUC-ROC curve is 0.824 (95% CI 0.759–0.878), the Youden index 0.625. ROC, receiver operating characteristic; AUC, area under the curve; CI, confidence interval.