Table 3 Predictive value of dispatch and ambulance suspicion of Covid 19 among all patients, and tested patients only (April 14 – August 31)
From: Prehospital identification of Covid-19: an observational study
All patients (n = 6776) | Tested patients only (n = 2252) | |||
|---|---|---|---|---|
Dispatch | Ambulance | Dispatch | Ambulance | |
Apparent prevalence, % | 16.8 (15.9–17.7) | 24.9 (23.9–25.9) | 31.9 (30.0–33.9) | 49.3 (47.2–51.4) |
True prevalence, % | 5.1 (4.6–5.7) | 5.1 (4.6–5.7) | 11.1 (9.8–12.4) | 11.1 (9.8–12.4) |
Sensitivity, % | 75.9 (71.0–80.3) | 82.2 (77.8–86.1) | 71.1 (65–76.6) | 79.1 (73.5–84.0) |
Specificity, % | 86.4 (85.5–87.2) | 78.2 (77.2–79.2) | 73.0 (71.0–74.9) | 54.4 (52.2–56.6) |
Positive predictive value, % | 23.1 (20.7–25.7) | 16.9 (15.2–18.8) | 24.7 (21.5–28) | 17.7 (15.5–20.1) |
Negative predictive value, % | 98.5 (98.2–98.8) | 98.8 (98.4–99.1) | 95.3 (94.1–96.3) | 95.4 (94.1–96.6) |