From: The impact of HLA-DRB1genes on extra-articular disease manifestations in rheumatoid arthritis
ExRA | Non-ExRA | P | |
---|---|---|---|
Number | 159 | 178 | |
Age at RA diagnosis (years; mean ± SD) | 50.1 ± 14.4 | 50.4 ± 14.8 | 0.87 |
Disease duration (years; mean ± SD) | 11.3 ± 11.2 | 12.5 ± 11.3 | 0.34 |
Male/female (n) | 75/84 | 66/112 | 0.06 |
RF positivea (%) | 87.2 | 58.3 | <0.0001 |
ANA positiveb (%) | 60.8 | 33.8 | <0.0001 |