Table 1 Sensitivity, specificity and positive predictive value of RF, anti-CCP and anti-RA33 autoantibodies in patients with very early RA
From: Autoantibodies in very early rheumatoid arthritis: diagnostic tools or pathogenic players?
| Â | RA (n = 100) | Non-RA (n = 80) | Sensitivity (%) | Specificity (%) | Positive predictive value (%) |
|---|---|---|---|---|---|
RF (≥ 20 U/ml) | 54 | 9 | 54 | 89 | 86 |
RF (≥ 50 U/ml) | 46 | 2 | 46 | 97 | 96 |
Anti-CCP | 42 | 1 | 42 | 98 | 97 |
Anti-RA33 | 26 | 8 | 26 | 90 | 76 |
RF + anti-CCP | 32 | 0 | 32 | 100 | 100 |
RF + RA33 | 15 | 0 | 15 | 100 | 100 |