Table 1.

Elements Required for the IMPACT and CRASH Prognostic Models

IMPACT			CRASH
Core model	Extended model	Lab model	Core model	CT model
Age	Core model plus:	Extended model plus:	Age	Core model plus:
Motor score	Hypoxia	Glucose	GCS score	Petechial hemorrhages
Pupil reactivity	Hypotension  CT classification  Traumatic subarachnoid   hemorrhage on CT  Epidural mass on CT	Hemoglobin	Pupil reactivity Major extracranial njury	Obliteration of the third   ventricle or basal cisterns  Subarachnoid bleeding  Midline shift  Non-evacuated hematoma

GCS, Glasgow Coma Scale; CT, computed tomography; IMPACT, International Mission for Prognosis and Analysis of Clinical Trials in TBI; CRASH, Corticosteroid Randomisation After Significant Head Injury.