Figure 2. Receiver Operating Characteristic Curves of the Predictive Model in the Estimation Group (n=403) and Using the Leave-one-out Cross-Validation.

The model included seven variables (abnormal CT or chest X-ray, chronic kidney disease, age, white blood cells, platelet count, alanine aminotransferase, and aspartate transaminase) to predict in-hospital mortality. The area under the ROC curves for the estimation and cross-validation analyses were 82.30 (95% CI: 77.52-87.09) and 80.14 (95% CI: 75.09-85.19), respectively.