Table 3.

Risk stratification of 6-months unfavorable outcome in head trauma based on CRASH model expected risk (ER

	Outcome		Likelihood ratio	P
	Favorable	Unfavorable
Basic model (%)
Low risk (ER < 18.0)	174 (100)	0 (0.0)	0.0*	<0.0001
Moderate risk (18.0 ≥ ER < 43.2)	46 (75.4)	15 (24.6)	---
High risk (ER ≥ 43.2)	25 (28.4)	63 (71.6)	7.5†
CT model
Low risk (ER < 17.8)	166 (100)	0 (0.0)	0.0*	<0.0001
Moderate risk (17.8 ≥ ER < 78.7)	74 (60.2)	49 (39.8)
High risk (ER ≥78.7)	4 (11.8)	30 (88.2)	23.9†

^*, Negative likelihood ratio

^†, Positive Likelihood ratio