| Controls (n = 1,004) | RA cases (n = 1,313) | anti-CCP-positive RA (n = 822) | anti-CCP-negative RA (n = 145) |
---|---|---|---|---|
Female, No. (%) | 864 (86.1) | 1,170 (89.1) | 734 (89.3) | 128 (88.3) |
Age (mean ± SD years) | 36.7 ± 12.5 | 51.8 ± 12.2 | 51.7 ± 11.8 | 50.5 ± 11.3 |
Onset age (mean ± SD years) | - | 40.6 ± 12.4 | 40.5 ± 12.1 | 38.5 ± 11.9 |
Ever-smokers, No. (%) | 134 (13.5) | 197 (15.3) | 119 (14.6) | 26 (17.9) |
Erosive disease (%) | - | 1,071 (81.6) | 682 (83.0) | 113 (77.9) |