Performance metrics results
| AUC | Sensitivity (%) | Specificity (%) | ||||
| Internal test set | External validation set | Internal test set | External validation set | Internal test set | External validation set | |
| No infection | 0.98 | 0.92 | 78.18 | 84.21 | 97.72 | 92.59 |
| Influenza/CAP | 0.89 | 0.92 | 82.97 | 78.57 | 88.79 | 89.44 |
| COVID-19 | 0.91 | 0.90 | 87.90 | 83.43 | 88.01 | 91.07 |
AUC: area under the curve; CAP: community-acquired pneumonia; COVID-19: coronavirus disease 2019.