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Comparison of the diagnostic efficacy of WBC, lymphocyte percentage, CRP, NLR, and combined CRP and NLR for COVID-19.
| AUC (95% CI) | Youden index | Sensitivity (%) | Specificity (%) | Cut-off value | |
|---|---|---|---|---|---|
| NLR | 0.835 (0.786–0.884) | 0.662 | 70.2 | 96.0 | 3.17 |
| CRP | 0.775 (0.717–0.832) | 0.668 | 72.8 | 94.0 | 8.55 |
| WBC | 0.416 (0.347–0.485) | 0.184 | 20.4 | 68.0 | 9.85 |
| LY% | 0.749 (0.690–0.809) | 0.650 | 67.0 | 98.0 | 21.34 |
| NLR and CRP | 0.863 (0.818–0.909) | 0.755 | 77.5 | 98.0 | 0.71 |
