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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)