Table 4.

Final stepwise linear regression models (p in = .1, p out = .15) assessing predictors of emergency department psychological symptoms after motor vehicle collision.

Dependent Variable	Independent Variable*	β	t	p
Dissociative symptoms†	COMT Pain Vulnerable Genotype	-.264	-2.317	.023
	Rearend Collision	-.202	-1.774.	.080
	Constant		14.140	<.0001
Distress symptoms¥	Income	-.278	-2.388	.020
	Airbag Deployed (Yes/No)	.234	2.003	.049
	Constant		9.751	<.0001

^*Candidate predictors for each model: demographic characteristics (age, gender, income, education), crash and injury characteristics (highest AIS score, car drivable at scene (yes/no), airbags deployed (yes/no)), and presence or absence of COMT pain vulnerable genotype.

^†Michigan Critical Events Perception Scale score

^¥Peritraumatic Distress Inventory score