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Table 1 Number (percentage) of autoantibody-positive patients pre-diagnosis

From: Development of anti-citrullinated protein antibody and rheumatoid factor isotypes prior to the onset of rheumatoid arthritis

Autoantibody-positive patients, number (percentage) Years pre-diagnosis, median (IQR)
  5.7 (4.0-6.3) 2.8 (1.9-3.6) 0.6 (0.4-1.1)
IgA ACPA 17 (57) 18 (60) 23 (77)
IgG ACPA 29 (97) 29 (97) 30 (100)
IgM ACPA 6 (20) 11 (37) 13 (43)
IgA RF 20 (67) 23 (77) 26 (87)
IgG RF 4 (13) 5 (17) 11 (37)
IgM RF 14 (47) 21 (70) 25 (83)
  1. ACPA, anti- citrullinated protein antibody; IQR, interquartile range;RF, rheumatoid factor.