Table 4 Performance measures for ACR 1997, SLICC and new EULAR/ACR criteria, at baseline/first visit
Classification System | Cut-off point | Sensitivity (IC 95%) | Specificity (IC 95%) | PPV (%) | NPV (%) | Cut-off point accuracy (IC 95%) |
|---|---|---|---|---|---|---|
ACR 1997 | ≥ 4 | 70.5% | 83.2% | 85.2% | 67.3% | 75.8 |
criteria | (61.6–78.4) | (73.7–90.3) |  |  | (69.5–81.4) | |
EULAR/ACR | Total | 87.7 | 67.4 | 78.7 | 80.0 | 79.2 |
score ≥ 10 | (80.5–93.0) | (56.7–77.0) |  |  | (73.0–84.4) | |
Total | 76.2 | 87.6 | 89.4 | 72.9 | 81.0 | |
score ≥ 13 | (67.9–83.5) | (79.0–93.7) |  |  | (75.1–86.1) | |
SLICC | ≥ 4 | 89.3 | 80.9 | 86.5 | 84.7 | 85.8 |
criteria | (82.5–94.2) | (71.2–88.5) |  |  | (80.3–90.2) |