From: Meta-genetic association of rheumatoid arthritis and PTPN22using PedGenie 2.1
 | NARAC Study 1a | NARAC Study 2a | ||||||
---|---|---|---|---|---|---|---|---|
 | Cases | Controls | Cases | Controls | ||||
 | N | % | N | % | N | % | N | % |
RA | 446 | Â | 767 | Â | 839 | Â | 854 | Â |
   Family-based | 446 | 100.0 | 103 | 13.4 | 839 | 100.0 | -- | -- |
   Independent | -- | -- | 664 | 86.6 | -- | -- | 854 | 100.0 |
   Age at onsetb | 39 | 13.9 | -- | -- | 39 | 13.1 | -- | -- |
   RF+ (≥ 11) | 346 | 77.5 | -- | -- | 708 | 84.4 | -- | -- |
   RF- (< 11) | 89 | 20.0 | -- | -- | 129 | 15.4 | -- | -- |
   RF unknown | 11 | 2.5 | -- | -- | 2 | 0.2 | -- | -- |
   anti-CCP+ (≥ 49) | 267 | 59.9 | -- | -- | 545 | 65.0 | -- | -- |
   anti-CCP- (< 49) | 141 | 31.6 | -- | -- | 274 | 32.7 | -- | -- |
   anti-CCP unknown | 38 | 8.5 | -- | -- | 20 | 2.4 | -- | -- |