Table 4. The risk stratification values of baseline PT and APTT among COVID-19 patients attending at the Tibebe Ghion Specialized Hospital, COVID-19 treatment center 2021 (n = 117).
| Parameter | Category | AUC (95% CI) | Cut-off value | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | Youden Index |
|---|---|---|---|---|---|---|---|---|
| PT, Sec | Severe from others | 0.89 (0.83–0.95) | ≥ 16.25 | 89.7 | 76.1 | 61.7 | 100 | 0.658 |
| Mild from others | 0.90 (0.84–0.96) | ≤ 15.35 | 82.2 | 86.1 | 95.75 | 100 | 0.683 | |
| APTT, sec | Severe from others | 0.74 (0.64–0.83) | ≥ 25.5 | 89.7 | 54.5 | 43.94 | 100 | 0.442 |
| Mild from others | 0.79 (0.7–0.88) | ≤ 25.35 | 77.8 | 79.2 | 90 | 100 | 0.57 |