Diagnostic ability for the diagnosis of RA of some variables collected at baseline, presented by decreasing sensitivity.
| Variable | Sensitivity Estimate (95% CI) | Specificity Estimate (95% CI) |
|---|---|---|
| Distal articular presentation | 94.6 (91.8–96.7) | 15.3 (11.8–19.5) |
| Presence of IgM RF | 69.4 (64.4–74.0) | 76.6 (71.9–80.9) |
| Pain on MTP squeeze test | 66.1 (61.1–70.9) | 49.3 (44.0–54.6) |
| Morning stiffness ≥ 30 min | 65.6 (60.5–70.4) | 49.9 (44.6–55.2) |
| Presence of anti-CCP | 65.6 (60.5–70.4) | 86.4 (82.4–89.7) |
| Symmetric presentation | 63.4 (58.3–68.3) | 45.7 (40.4–51.0) |
| Painful joint count ≥ 6 | 55.9 (50.7–61.0) | 58.2 (52.9–63.4) |
| Swollen joint count ≥ 6 | 55.6 (50.4–60.8) | 67.1 (62.0–72.0) |
| CRP > 10 mg/l | 52.7 (47.5–57.9) | 61.6 (56.3–66.6) |
| ESR > 28 mm | 44.3 (39.2–49.5) | 68.4 (63.2–73.2) |
| Radiographic erosions | 31.8 (26.9–37.1) | 86.5 (82.3–90.1) |
| HLA-DR 1, 4 double-dose | 13.7 (10.2–17.8) | 95.9 (93.1–97.7) |
| Nodules | 2.4 (1.1–4.6) | 100.0 (99.0–100.0) |
For abbreviations see Table 1.