Table 1 Characteristics of rheumatoid arthritis (RA) index cases from the investigated samples
TDT RA sample 1 (n = 100) | TDT RA sample 2 (n = 100) | ASP RA sample (n = 88) | |
|---|---|---|---|
Female (%) | 87 | 90 | 84 |
Mean age (± standard deviation) at disease onset (years) | 32 (± 10) | 31 (± 6) | 40 (± 14) |
Mean (± standard deviation) disease duration (years) | 18 (± 7) | 16 (± 8) | 23 (± 10) |
RA patients with bone erosions (%) | 90 | 79 | 80 |
RA patients seropositive for rheumatoid factor (%) | 81 | 76 | 84 |
RA patients carrying at least one HLA-DRB1 shared epitope allelea (%) | 78 | 80 | 77 |