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Validity of RDW and ESR to differentiate between RA and controls.
| Variables | Cut point | Sensitivity | Specificity | Accuracy | PPV | NPV |
|---|---|---|---|---|---|---|
| RDW | >14.1 % | 52.25% | 95.88% | 75.1% | 93.5% | 63.7% |
| ESR | >26 mm/hr | 81.98% | 94.85% | 88.6% | 94.8% | 82.1% |
PPV: positive predictive value, NPV: negative predictive value, RDW: Red Cell Distribution Width, ESR: Erythrocyte Sedimentation Rate, %: percent.
