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Table 1 Baseline characteristics of the patients in the study

From: Influence of HLA DRB1 alleles in the susceptibility of rheumatoid arthritis and the regulation of antibodies against citrullinated proteins and rheumatoid factor

  RA (n = 253) Non-RA (n = 173)
Age in years, mean ± standard deviation 62 ± 12 50 ± 14
Percentage of patients who are women 64 55
ACPA-positive, number (percentage) 143 (61.9%) 9 (5.6%)
RF-positive, number (percentage) 169 (72.5%) 27 (15.9%)
Duration of symptoms in weeks, median (range) 20 (3-52) 15 (2-52)
  1. Percentages exclude missing data.
  2. ACPA, anti-citrullinated protein antibody; Non-RA, other arthropathies; RA, rheumatoid arthritis; RF, IgM rheumatoid factor.