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Table 2 Estimated DTA measures (95% CI) of the key indicator symptom combinations Unconscious, alone and with any one or more symptoms: Not Breathing, Ineffective Breathing or Noisy Breathing

From: Predictors of recognition of out of hospital cardiac arrest by emergency medical services call handlers in England: a mixed methods diagnostic accuracy study

  Sensitivity Specificity PPV NPV
Unconscious 86.0 (80.2–90.5) 93.4 (89.0–96.2) 14.0 (8.9–22.7) 99.8 (99.7–99.9)
Unconscious and (A) Noisy Breathing 23.6 (17.8–30.4) 98.8 (96.1–99.9) 19.3 (6.7–67.2) 99.0 (98.9–99.2)
Unconscious and (B) Ineffective Breathing 51.7 (44.3–58.9) 97.4 (94.1–99.0) 20.0 (9.7–40.2) 99.4 (99.3–99.5)
Unconscious and (C) Not Breathing 53.4 (45.8–60.5) 98.6 (95.9–99.7) 33.0 (13.4–71.6) 99.4 (99.3–99.5)
Unconscious and at least one of
(B) Ineffective Breathing or (C) Not breathing 78.1 (71.4–83.8) 96.2 (92.8–98.2) 20.5 (11.6–35.4) 99.7 (99.6–99.8)
Unconscious and at least one of (A) Noisy Breathing,
(B) Ineffective Breathing or (C) Not Breathing 79.8 (73.5–85.3) 95.7 (92.1–97.8) 18.7 (11.0–32.0) 99.7 (99.6–99.8)