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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)
  1. All data presented with point estimates and exact binomial 95% Confidence intervals