Table 5. AUC for Severity Classification of COVID-19 Using Quantitative CT Parameters and Semiquantitative Visual Score.
| Test Result Variable(s) | Cutoff | Sensitivity (%) | Specificity (%) | Youden's Index (%) | AUC | ||||
|---|---|---|---|---|---|---|---|---|---|
| Value | 95% CI | Value | 95% CI | Value | P | 95% CI | |||
| Volume of lesions (cm3) | 42.018 | 91.4 | 85.1–95.6 | 55.9 | 42.4–68.6 | 47.3 | 0.804 | < 0.001 | 0.739–0.858 |
| Percentage of lesions | 7.477 | 50.8 | 41.8–59.7 | 93.2 | 83.5–98.1 | 44.0 | 0.807 | < 0.001 | 0.744–0.861 |
| Volume of ground-glass opacities (cm3) | 28.780 | 92.2 | 86.1–96.2 | 54.2 | 40.8–67.3 | 46.4 | 0.788 | < 0.001 | 0.722–0.844 |
| Percentage of ground-glass opacities | 0.671 | 93.0 | 87.1–96.7 | 55.9 | 42.4–68.8 | 48.9 | 0.795 | < 0.001 | 0.730–0.851 |
| Semiquantitative score | 2.000 | 85.9 | 78.7–91.4 | 52.5 | 39.1–65.7 | 38.5 | 0.716 | < 0.001 | 0.646–0.780 |
AUC = area under curve, CI = confidence interval