|  |  | Patients | |||
---|---|---|---|---|---|---|
Demographic categories | Age-similar hospital personnel ( N = 19) | Blood bank donors ( N = 53) | Systemic lupus erythematosus ( N = 17) | Other CTD ( N = 17) | Early RA ( N = 50) | Late RA ( N = 43) |
Age, mean (range)b | 48 (36 to 80) | N/A | 44 (25 to 59) | 50 (27 to 88) | 53 (30 to 80) | 60 (21 to 85) |
Sex, females/malesc | 7/12 | N/A | 17/17 | 15/17 | 36/14 | 31/12 |