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Table 1 Priority dispatch and NACA score

From: Prehospital triage accuracy in a criteria based dispatch centre

Missions

Total [n (%)]

P1 [n (%)]

P2 [n (%)]

P3 [n (%)]

Correct correlation [n (%)]

NACA 0

332 (1.2)

184 (55.4)

128 (38.6)

20 (6.0)

148 (44.6)

NACA 1

1’247 (4.5)

830 (66.5)

371 (29.8)

46 (3.7)

417 (33.4)

NACA 2

7’122 (25.6)

4’285 (60.2)

2’228 (31.3)

609 (8.5)

2’837 (39.8)

NACA 3

15’208 (54.5)

7’034 (46.2)

5’290 (34.8)

2’884 (19.0)

8’174 (53.7)

NACA 4

2’480 (8.9)

2’034 (82.0)

376 (15.2)

70 (2.8)

2’034 (82.0)

NACA 5

867 (3.1)

767 (88.5)

79 (9.1)

21 (2.4)

767 (88.5)

NACA 6

203 (0.7)

196 (96.5)

5 (2.5)

2 (1.0)

196 (96.6)

NACA 7

427 (1.5)

419 (98.1)

7 (1.7)

1 (0.2)

419 (98.1)

Total

27’886 (100)

15’749 (56.5)

8’484 (30.4)

3’653 (13.1)

14’992 (53.8)

  1. OVER TRIAGE = P1 dispatch with NACA <4 (false positive) / all P1 dispatch (false positive + true positive) = 12’333/15’749 = 78 %
  2. UNDER TRIAGE = P2 or P3 dispatch with NACA >3 (false negative) / all P2 or P3 dispatch (false negative + true negative) = 561/12’137 = 4.6 %
  3. Sensitivity was calculated as true positives/(true positives + false negatives); specificity, as true negatives/(false positives + true negatives)
  4. Positive predictive value (PPV) was calculated as true positives/(true positives + false positives); negative predictive value (NPV), as true negatives/(true negatives + false negatives)
  5. Sensibility = TP / (TP + FN) = 86 % = 95 % CI (85.6–86.4)
  6. Specificity = FN / (FN + FP) = 48 % = 95 % CI (47.4–48.6)
  7. PPV = TP/(TP + FP) = 21.7 % = 95%CI (21.2–22.2)
  8. NPV = TN/(TN + FN) = 95.4 % = 95 % CI (95.2–95.6)
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BMC Emergency Medicine

ISSN: 1471-227X

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