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Table 3 Injury severity and trauma team activation (TTA)

From: Calculating trauma triage precision: effects of different definitions of major trauma

  Major trauma Non-major trauma 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); Positive predictive value (PPV) = a/(a + b).
  2. Undertriage = 1-Sensitivity = c/(a + c); Overtriage = 1-PPV = b/(a + b).