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Table 1 Patients and controls for protein arrays and ELISA

From: New autoantibodies in early rheumatoid arthritis

  Number Age at diagnosis Disease duration Anti-CCP-positive RF-positive
   (years) (years) (%) (%)
RA <1 year 144 54 0.8 70 68
RA >5 years 59 48 11 87 75
AS 88 34 10 1 nd
PsA 30 41 6 3 nd
SLE 21 37 8 5 nd
SSC 20 51 0.5 5 nd
Healthy 50 nd nd 0 nd
  1. ELISA, enzyme-linked immunosorbent assay; CCP, cyclic citrullinated peptide; RF, rheumatoid factor; RA, rheumatoid arthritis; AS, ankylosing spondylitis; PsA, psoriatic arthritis; SLE, systemic lupus erythematosus; SSC, systemic sclerosis; nd, not determined.