Patient Population | N | IgG anti-CCP2+ % (95% CI) | IgG anti-CCP3+ % (95% CI) |
---|---|---|---|
Healthy blood donors | 100 | 1 (0–5) | 3 (1–9) |
Systemic lupus erythematosus | 50 | 6 (1–17) | 10 (3–22) |
Rheumatoid arthritis | 137 | 65 (56–73) | 76 (68–83) |
RF+ in RA | 109 | 76 (67–84) | 85 (77–91) |
RF− in RA | 28 | 19 (7–39) | 35 (17–56) |
RF IgM+ in the GPP (ELISA) | 282 | 24 (20–30) | 25 (20–31) |
RF+ in the GPP (turbidimetry) | 218 | 33 (27–40) | 34 (27–40) |
All GPP specimens | 1021 | 7.7 (6–10) | 8.4 (7–10) |