Table 2 Comparison of anti-cyclic citrullinated peptide (CCP) and rheumatoid factor (RF) reactivity
Anti-CCP (+) n = 153Anti-CCP (−) n = 59
RF +142 (92.81%)RF +33 (55.93%)
RF −11 (7.19%%)RF −26 (44.06%)
  • A total of 21 anti-CCP (+) had no corresponding RF data; 8 anti-CCP (−) had no corresponding RF data; κ = 0.417, p<0.001.