| ANA | RF | Anti-Ro/SSA | Anti-La/SSB | |
|---|---|---|---|---|
| Grade I (n = 5) | 40% | 60% | 0% | 0% |
| Grade II (n = 12) | 50% | 41,7% | 11,1% | 0% |
| Grade III (n = 58) | 59,6% | 33,9% | 14,7% | 8,8% |
| Grade IV (n = 45) | 80% | 65,9% | 28,9% | 15,8% |
| Sensitivity for a positive biopsy | 47,5% | 67,9% | 22,2% | 12,5% |
| Specificity for a positive biopsy | 41,9% | 43,3% | 81,8% | 86,3% |