Patient characteristics
| RA (n = 295; 41.3%) | Degen/inflam joint disease (n = 163; 22.8%) | Conn tiss disease/vasculitis (n = 103; 14.4%) | Healthy controls (n = 154; 21.5%) | Total (n = 715) | |
|---|---|---|---|---|---|
| CCP, anti-cyclic citrullinated peptide antibodies; Conn tiss, connective tissue; Degen, degenerative; Ig, immunoglobulin; inflam, inflammatory; RA, rheumatoid arthritis; RF, rheumatoid factor. | |||||
| Female | 237 (80.3%) | 107 (65.6%) | 81 (78.6%) | 84 (54.5%) | 509 (71.2%) |
| Age (mean (SD)) (years) | 62.4 (14.7) | 56.1 (18.4) | 51.6 (19.1) | 50.0 (19.7) | 56.8 (18.1) |
| IgG-RF positive | 129 (43.7%) | 11 (6.7%) | 20 (19.4%) | 7 (4.5%) | 167 (23.4%) |
| IgA-RF positive | 150 (50.8%) | 16 (9.8%) | 26 (25.2%) | 7 (4.5%) | 199 (27.8%) |
| IgM-RF positive | 196 (66.4%) | 20 (12.3%) | 44 (42.7%) | 11 (7.1%) | 271 (37.9%) |
| CCP positive | 190 (64.4%) | 4 (2.5%) | 7 (6.8%) | 1 (0.6%) | 202 (28.3%) |