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Table 1 Characteristics of the rheumatoid arthritis patient cohort

From: Negative association of the chemokine receptor CCR5 d32 polymorphism with systemic inflammatory response, extra-articular symptoms and joint erosion in rheumatoid arthritis

Number of patients (female/male) 503 (369/134)
Age at onset (years) (median (range)) 49 (18 to 84)
Disease duration (years) (median (range)) 16 (2 to 70)
Patients positive for RF IgM (%) 76.9
Patients positive for RF IgA (%) 53.2
Patients positive for anti-CCP antibodies (%) 70.5
Patients positive for ANA (%) 36.9
Extra-articular manifestations  
   Rheumatoid nodules (%) 31.4
   Polyserositis (%) 2.4
   Interstitial pulmonary fibrosis (%) 5.5
   Raynaud's syndrome (%) 5.2
   Vasculitis (%) 12.5
Erosive disease (%) 80.7
  1. ANA = Antinuclear antibodies; CCP = cyclic citrullinated peptide; RF = rheumatoid factor.