Table 4.
Assessment of the ability of CRP, RF, ESR, NLR, and Pre‐1 in the diagnosis of RA
| Item | AUC | Cutoff | Sensitivity (%) | Specificity (%) | Maximum Youden index | Negative likelihood ratio | Positive likelihood ratio | Diagnosis accuracy (%) |
|---|---|---|---|---|---|---|---|---|
| CRP | 0.938 | 3.20 | 77.0 | 89.4 | 0.8064 | 0.0072 | 5.30 | 82.20 |
| RF | 0.974 | 19.0 | 87.5 | 91.0 | 0.8352 | 0.074 | 9.53 | 89.00 |
| ESR | 0.751 | 34.0 | 74.1 | 73.5 | 0.5222 | 0.37 | 3.98 | 73.90 |
| NLR | 0.831 | 2.13 | 76.7 | 75.9 | 0.5424 | 0.31 | 3.51 | 76.40 |
| Pre‐1 | 0.988 | 0.61 | 93.0 | 95.1 | 0.8958 | 0.078 | 32.35 | 93.90 |
Abbreviations: AUC, area under the curve; CRP, C‐reactive protein; ESR, erythrocyte sedimentation rate; NLR, neutrophil‐to‐lymphocyte ratio; Pre‐1, predicted probability‐1; RF, rheumatoid factor.