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Table 1 Clinical characteristics of rheumatoid arthritis cases

From: Evaluation of the rheumatoid arthritis susceptibility loci HLA-DRB1, PTPN22, OLIG3/TNFAIP3, STAT4 and TRAF1/C5 in an inception cohort

  Total RA cohort (n = 1,046) Autoantibody-positive RA (n = 692) Autoantibody-negative RA (n = 325)
  Number of valid subjects Summary Number of valid subjects Summary Number of valid subjects Summary
Age (years) 926 59 (14) 411 57 (13) 183 60 (14)
Gender (female) 1046 702 (67%) 692 468 (68%) 325 210 (65%)
Rheumatoid factor-positive 970 628 (65%) 667 628 (94%) N/A N/A
Cyclic citrullinated peptide-positive 619 389 (63%) 445 389 (87%) N/A N/A
Erosions at baselinea 607 132 (22%) 421 95 (23%) 186 37 (28%)
Swollen joint count at baselinea 648 9.7 (6.2 to 10.2) 447 9.3 (8.8 to 9.9) 186 10.8 (9.8 to 11.8)
Health Assessment Questionnaire at baselinea 648 1.33 (1.27 to 1.39) 447 1.35 (1.28 to 1.42) 186 1.30 (1.19 to 1.41)
  1. Data presented as mean (standard deviation), n (%) or mean (95% confidence interval). N/A, not applicable; RA, rheumatoid arthritis. aSubgroup of individuals with documented symptom duration <24 months.