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Table 1 Characteristics of rheumatoid arthritis (RA) index cases from the investigated samples

From: The ITGAVrs3738919-C allele is associated with rheumatoid arthritis in the European Caucasian population: a family-based study

  Sample 1 (n = 100) Sample 2 (n = 100) Sample 3 (n = 265)
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
  1. n, number of cases.