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The fraction of samples positive for RF-IgM, Anti-CCP, and GPI in RA and OA serum
| Group | RF-IgM(+/-) | Anti-CCP(+/-) | GPI(+/-) |
|---|---|---|---|
| RA serum (n = 22) | 17/5* | 15/7** | 14/8** |
| OA serum (n = 13) | 4/9* | 0/13** | 2/11** |
RF-IgM: rheumatoid factor-IgM; Anti-CCP: anti-cyclic citrullinated peptide antibody; GPI: glucose-6-phosphate isomerase antibodies; RA: rheumatoid arthritis; OA: osteoarthritis. *: P <0.05, **: P <0.01.
