Table 7 Predictive values of single and combined variables for positive Covid tests in asymptomatic patients (n = 171)
Characteristic variables | AUC | Cut off values* | Sensitivity(%) | Specificity(%) | PPV(%) | NPV(%) | Accuracy(%) |  + LR | -LR | Variable P |
|---|---|---|---|---|---|---|---|---|---|---|
Single variable | ||||||||||
 Lym | 0.667 |  ≤ 1.22 | 40.74 | 87.30 | 84.61 | 46.22 | 57.89 | 3.21 | 0.68 |  < 0.001 |
 MO | 0.601 |  > 0.51 | 36.11 | 82.54 | 78.00 | 42.97 | 53.22 | 2.07 | 0.77 |  < 0.050 |
 MO (%) | 0.708 |  > 6.70 | 52.78 | 84.13 | 85.08 | 50.96 | 64.33 | 3.33 | 0.56 |  < 0.001 |
 PLR | 0.627 |  > 183.85 | 37.96 | 85.71 | 82.00 | 44.62 | 55.56 | 2.66 | 0.72 |  < 0.010 |
Combined variables | ||||||||||
 Lym + MO | 0.687 |  > 0.6465 | 57.41 | 79.37 | 82.7 | 52.1 | 65.50 | 2.78 | 0.54 |  > 0.05* |
 PLR + MO | 0.671 |  > 0.6190 | 53.70 | 74.60 | 78.40 | 48.50 | 61.40 | 2.11 | 0.62 |  > 0.05* |
 Lym + MO% | 0.733 |  > 0.6742 | 57.41 | 87.30 | 85.6 | 54.5 | 68.42 | 4.52 | 0.49 |  > 0.05* |
 PLR + MO% | 0.740 |  ≤ 0.6738 | 57.41 | 85.71 | 87.3 | 54.0 | 67.84 | 4.02 | 0.50 |  < 0.01# |