Table 3

 Performance measures of the clinical decision rule

HTI outcome*
Derivation sample(95% CI)Cross validation
*High therapeutic intensity (HTI) outcome: neurosurgery, laparotomy, vasopressor support, transfusion ⩾ 6 units of packed red blood cells, or death within 72 hours of ED presentation.
Sensitivity94%(91–97%)90%
Specificity63%(57–69%)55%
Positive predictive value71%(66–76%)66%
Negative predictive value92%(87–96%)85%
Positive likelihood ratio2.56(2.18–3.01)2.00
Negative likelihood ratio0.09(0.05–0.15)0.19