Table 5 Sensitivity, specificity, and predictive values for ambulance priorities
EMD | EMD + RN | p-value | |||
|---|---|---|---|---|---|
Numbers | Probability % (95% CI) | Numbers | Probability% (95% CI) | ||
Red/Orange | |||||
Sensitivity | 5468/(5468 + 4544) | 54.6% (53.6–55.6) | 114/(114 + 271) | 29.6% (25.1–34.5) | < 0.01 |
Specificity | 8299/(4034 + 8299) | 67.3% (66.5–68.1) | 656/(117 + 656) | 84.8% (82.1–87.3) | < 0.01 |
PPV | 5468/(5468 + 4034) | 57.5% (56.5–58.5) | 114/(114 + 117) | 49.4% (42.8–56.0) | 0.016 |
NPV | 8299/(4544 + 8299) | 64.6% (63.8–65.4) | 656/(271 + 656) | 70.8% (67.7–73.7) | < 0.01 |
Yellow | |||||
Sensitivity | 5531/(5531 + 3583) | 60.7% (59.7–61.7) | 318/(318 + 186) | 63.1% (58.7–67.3) | 0.30 |
Specificity | 7122/(6109 + 7122) | 53.8% (53.0–54.7) | 238/(416 + 238) | 36.4% (32.7–40.2) | < 0.01 |
PPV | 5531/(5531 + 6109) | 47.5% (46.6–48.4) | 318/(318 + 416) | 43.3% (39.7–47.0) | 0.03 |
NPV | 7122/(3583 + 7122) | 66.5% (65.6–67.4) | 416/(318 + 416) | 56.1% (51.3–60.9) | < 0.01 |
Green | |||||
Sensitivity | 320/(320 + 2899) | 9.9% (8.9–11.0) | 49/(49 + 220) | 18.2% (13.9–23.5) | < 0.01 |
Specificity | 18,243/(883 + 18,243) | 95.4% (95.1–95.7) | 745/(144 + 745) | 83.8% (81.2–86.1) | < 0.01 |
PPV | 320/(320 + 883) | 26.6% (24.1–29.2) | 49/(49 + 144) | 25.4% (19.5–32.2) | 0.80 |
NPV | 18,243/(2899 + 18,243) | 86.3% (85.8–86.7) | 745/(220 + 745) | 77.2% (74.4–79.8) | < 0.01 |