Skip to main content

Advertisement

Table 2 Performance of the trauma team activation protocol during 2006-2007 at the University Hospital of North Norway Tromsø, evaluated with injury severity (ISS>15) and need for emergency procedure, n = 441

From: Evaluation of a university hospital trauma team activation protocol

2 × 2 table for calculations on performance by injury severity 2 × 2 table for calculations on performance by need for emergency procedure
  ISS > 15 ISS ≤ 15 Sum   Procedure No procedure Sum
TTA 110 (a) 272 (b) 382 TTA 112 (a) 270 (b) 382
No TTA 51 (c) unknown (d) n/a No TTA 30 (c) unknown (d) n/a
Sum 161 n/a n/a Sum 142 n/a n/a
Performance by injury severity Performance by need for emergency procedure
Sensitivity PPV Overtriage Undertriage Sensitivity PPV Over Triage Undertriage
68% 29% 71% 32% 79% 29% 71% 21%
  1. Sensitivity = a/(a + c), specificity = d/(b + d), Positive Predictive Value (PPV) = a/(a + b), Negative Predictive Value (NPV) = d/(c + d), Overtriage = 1 - PPV = b/(a + b), Undertriage = 1 - Sensitivity = c/(a + c). N/a = not applicable.
  2. Specificity and NPV are not applicable to the dataset, as (d) is unknown because the total number of minor injuries can not be identified.