Table 1 Characteristics of the rheumatoid arthritis patient cohort
Number of patients (female/male) | 503 (369/134) |
Age at onset (years) (median (range)) | 49 (18 to 84) |
Disease duration (years) (median (range)) | 16 (2 to 70) |
Patients positive for RF IgM (%) | 76.9 |
Patients positive for RF IgA (%) | 53.2 |
Patients positive for anti-CCP antibodies (%) | 70.5 |
Patients positive for ANA (%) | 36.9 |
Extra-articular manifestations | |
Rheumatoid nodules (%) | 31.4 |
Polyserositis (%) | 2.4 |
Interstitial pulmonary fibrosis (%) | 5.5 |
Raynaud's syndrome (%) | 5.2 |
Vasculitis (%) | 12.5 |
Erosive disease (%) | 80.7 |