| RA cases (n = 1,217)* | Controls (n = 717)* |
---|---|---|
Age of onset (mean ± SD years) | 41.9 ± 12.8 | 35.1 ± 10.7 |
Disease duration (mean ± SD years) | 9.9 ± 11.1 | - |
Female (%) | 87.4 | 85.3 |
Rheumatoid factor (%) | 97.8 | - |
Anti-cyclic citrullinated peptide autoantibodies (%) | 98.1 | - |