Demographic and clinical characteristics of patients with RA
| Study group | Control group | |
|---|---|---|
| Women/men (%) | 17 (77)/5 (23) | 18 (82)/4 (18) |
| Age, mean (SD) | 52.9 (15.4) | 51 (14.3) |
| Mean (SD) disease duration in year (range) | 11.2 (9.4) | 7.6 (7) |
| Number of patients RF positive (%) | 16 (73) | 16 (73) |