Rates of occurrence of serological markers obtained with IIF and ELISA assays in patients with and without RA, and healthy control groups
| Serological variables | RA patients n=96 (%) | Patients with rheumatic diseases other than RA n=90 (%) | Healthy donors n=37 (%) |
| AKA | 42 (44)2-150 | 3 (3) | 1 (3) |
| ANCA | 32 (33)2-160 | 17 (19) | 3 (8) |
| pANCA | 32 | 16 | 2 |
| cANCA | 0 | 1 | 1 |
| ANA | 49 (51) | 38 (42) | 3 (8) |
| Homogeneous | 32 | 21 | 1 |
| Speckled | 12 | 10 | 1 |
| Nucleolar | 6 | 10 | 0 |
| Centromere | 3 | 4 | 1 |
| IgA RF | 74 (77)2-150 | 20 (22) | 0 |
| IgM RF | 75 (78)2-150 | 19 (21) | 2 (5) |
| IgA RF + IgM RF | 69 (72)2-150 | 15 (17) | 0 |
| PR3-ANCA | 1 (1) | 0 | 1 (3) |
| MPO-ANCA | 4 (4) | 1 (1) | 0 |
| LF-ANCA | 18 (19) | 10 (11) | 1 (3) |
| Anti-dsDNA | 10 (10) | 9 (10) | 0 |
| Antihistone | 5 (5) | 7 (8) | 0 |
| Anti-Ro(SS-A) | 4 (4) | 3 (3) | 0 |