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Table 2 Sensitivity, specificity, PPV, NPV, and under- and over-triage for DC A and B before and after merging (A + B)

From: Merger of two dispatch centres: does it improve quality and patient safety?

 

DC A % (95% CI)

DC B % (95% CI)

A + B % (95% CI)

Sensitivity

86.0 (85.6–86.4)

91.6 (91.0–92.2)

86.8 (86.5–87.1)

Specificity

48.0 (47.4–48.6)

20.3 (19.4–21.2)

67.4 (66.9–67.9)

PPV

21.7 (21.2–22.2)

16.1 (15.3–16.9)

29.2 (28.7–29.7)

NPV

95.4 (95.2–95.6)

93.5 (93.0–94.0)

97.0 (96.8–97.2)

Over-triage

78.0 (77.5–78.5)

83.9 (83.1–84.7)

70.8 (70.3–71.3)

Under-triage

4.6 (4.4–4.8)

6.5 (6.0–7.0)

3.0 (2.8–3.2)

  1. Over-triage = P1 dispatch with NACA <4 (false positives)/all P1 dispatch (false positives + true positives) Under-triage = P2 or 3 dispatch with NACA >3 (false negatives)/all P2 or P3 dispatch (false negatives + true negatives) Sensitivity was calculated as true positives/(true positives + false negatives); specificity as true negatives/(false positives + true negatives) Positive predictive value (PPV) was calculated as true positives/(true positives + false positives); negative predictive value (NPV) as true negatives/(true negatives + false negatives)