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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).