Table 2: Anti-GPC Ab levels and other autoantibodies.

RA (n = 45) AITD (n = 36) Control (n = 44) 'p' value
Number of Anti-GPC Ab > 24.9 Units* (Prevalence %) 7 (15.6%) 4 (11.1%) 8 (18.2%)
Anti-GPC Ab levels (Units) 23.7 ± 18.8 18.3 ± 22.2 22.6 ± 25.5 0.538
Number of Anti-TPO Ab > 34 International Units/mL*(Prevalence %) 4 (8.9%) 12 (33.3%) 7 (15.9%)
Anti-TPO Ab levels (International Units/mL) 15.1 ± 11.1 287.5 ± 949.5 46.4 ± 146.1 0.087
Anti-nuclear antibody titer over 1:80 8 1 2
Anti-CCP IgG levels (Units) 145.1 ± 103.7 11.1 ± 5.6 11.5 ± 7.6 < 0.001
Number of RF > 15 International Units/mL (Prevalence %) 31 (68.9%) 1 (2.8%) 4 (9.0%)
RF value (International Units/mL) 73.0 ± 71.0 10.0 ± 4.2 14.4 ± 20.9 < 0.001

Key: *Threshold at which anti-GPC or anti-TPO antibodies as well as rheumatoid factor (RF) were counted as "positive" were determined by established ranges provided by our reference lab.