Table 2. Comparing outcome predictor models for TBI IMPACT = International Mission for Prognosis and Analysis of Clinical Trials in TBI; CRASH = Corticosteroid Randomization After Significant Head Injury; CT = computed tomography; Hgb = hemoglobin; *CT findings in the extended IMPACT models = diffuse brain injury, evacuated vs... non-evacuated hemorrhage, traumatic subarachnoid hemorrhage, epidural mass; **CT findings in the extended CRASH model = midline shift, petechial hemorrhages, traumatic subarachnoid hemorrhage, obliteration of the 3rd ventricle or basal cisterns, non-evacuated hemorrhage; ***CT findings in the Brazilian model = Marshall classification.

Model	Patient age	GCS	Pupil reactivity	Other
TBI-IMPACT–core	+	motor score	+	-
TBI-IMPACT – CT extended	+	motor score	+	hypotension, hypoxia, CT findings*
TBI-IMPACT – CT & lab extended	+	motor score	+	hypotension, hypoxia, CT findings*, serum glucose & Hgb
CRASH–core	+	+	+	extracranial injury
CRASH–extended	+	+	+	extracranial injury, CT findings**
Brazilian model	+	+	+	CT findings***
Dutch model (Nijmegen)	+	+	+	hypotension, CT findings