Table 2 Sensitivity, specificity, PPV and NPVa stratified by priority level using Medical Index and RETTS-A (n = 1278)
From: A comparison of two emergency medical dispatch protocols with respect to accuracy
Priority level | Sensitivity | Specificity | PPV | NPV |
|---|---|---|---|---|
Medical Index (n = 634) | ||||
1 | 82.6% (76.6–87.3) | 59.0% (54.3–63.5) | 47.2% (76.6–87.3) | 52.8% (47.5–58.0) |
2 | 49.7% (42.2–52.5) | 38.7% (34.3–43.4) | 66.1%(60.3–71.4) | 33.9% (28.6–39.7) |
3 | 14.1% (8.0–24.0) | 98.9% (97.7–99.5) | 62.5% (38.6–81.5) | 37.5% (18.5–61.4) |
RETTS-A (n = 644) | ||||
Red | 54.0% (44.3–63.4) | 83.6% (80.3–86.5) | 37.8% (30.2–45.9) | 62.2% (54.1–69.8) |
Red+Orangeb | 78.9% (74.9–82.5) | 48.0% (41.1–54.9) | 77.4% (73.3–81.0) | 22.6% (19.0–26.7) |
Orange | 53.2% (47.9–53.9) | 57.0% (51.4–62.5) | 59.0% (53.4–64.3) | 41.0% (35.7–46.6) |
Yellow | 45.5% (37.6–53.6) | 82.6% (79.0–85.6) | 48.4% (40.6–56.2) | 56.9% (48.9–64.5) |
Green | 9.4% (4.1–2.3) | 95.1% (93.0–96.6) | 13.9% (6.1–28.7) | 86.1% (71.3–93.9) |