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Characteristics of rheumatoid arthritis (RA) index cases from the investigated samples |
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| Sample 1 (n = 100) |
Sample 2 (n = 100) |
Sample 3 (n = 265) |
|
|
|
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| Females (%) |
87 |
90 |
86 |
| Mean age of disease onset (years) (±standard deviation) |
32 (±10) |
31 (±6) |
30 (±9) |
| Mean disease duration (years) (±standard deviation) |
18 (±7) |
16 (±8) |
8 (±7) |
| RA patients with bone erosions (%) |
90 |
79 |
72 |
| RA patients seropositive for rheumatoid factor (%) |
81 |
76 |
73 |
| RA patients carrying at least one HLA-DRB1 shared epitope allele (%) |
78 |
80 |
Not available |
|
n, number of cases. | |||
Jacq et al. Arthritis Research & Therapy 2007 9:R63 doi:10.1186/ar2221 |
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