Table 3.
The Diagnostic Value of PLT, RBC, Hb, RPR and HPR for RA
| Parameters | AUC | 95% CI | Optimal Cut-off Value | Specificity (%) | Sensitivity (%) | PPV (%) | NPV (%) | AC (%) |
|---|---|---|---|---|---|---|---|---|
| PLT(109/L) | 0.648 | 0.584–0.709 | >237 | 82.26 | 46.55 | 72.41 | 60.61 | 64.41 |
| RBC (1012/L) | 0.785 | 0.727–0.835 | <4.29 | 77.42 | 72.63 | 76.28 | 73.88 | 75.03 |
| Hb (g/L) | 0.787 | 0.730–0.837 | <128 | 77.42 | 73.74 | 76.56 | 74.67 | 75.58 |
| RPR | 0.747 | 0.687–0.801 | <0.018 | 90.32 | 55.17 | 85.07 | 66.83 | 72.75 |
| HPR | 0.738 | 0.677–0.793 | <0.54 | 83.87 | 55.75 | 77.56 | 65.46 | 69.81 |
Abbreviations: AUC, area under curve; 95% CI, 95% confidence interval; PPV, positive predictive value; NPV, negative predictive value; AC, accuracy; RBC, red blood cells; Hb, hemoglobin; PLT, platelet; RPR, red blood cells-platelet ratio; HPR, hemoglobin–platelet ratio.