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Table 1 Injury severity and trauma team activation (TTA)

From: Precision of field triage in patients brought to a trauma centre after introducing trauma team activation guidelines

 

Severely injured

Not severely injured

Total

TTA

(a)

(b)

(a + b)

No TTA

(c)

(d)

(c + d)

Total

(a + c)

(b + d)

(n)

  1. Sensitivity = a/(a + c); Specificity = d/(b + d)
  2. Positive predictive value (PPV) = a/(a + b)
  3. Undertriage = 1 - Sensitivity = c/(a + c); Overtriage = 1 - PPV = b/(a + b)