Table 4.

Results of regression models examining the ability of sensation seeking and exposure to stressors to predict count of substance uses by age 15.

	Model I		Model II		Model III
	exp[β]	95% CI	exp[β]	95% CI	exp[β]	95% CI
Sex
Female (RC)	–		–		–
Male	1.14	0.93-1.76	0.77	0.55-1.09	0.98	0.70-1.39
Ethnicity
Caucasian (RC)	–				–
Hispanic	0.46**	0.27–0.77	0.16**	0.09–0.30	0.33*	0.18–0.62
African-American	0.18**	0.10–0.35	0.26**	0.13–0.52	0.34*	0.17–0.69
Other	0.02*	0.01–0.06	0.01**	0.00–0.05	0.04**	0.01–0.14
SES	0.93**	0.91–0.94	0.91**	0.89–0.92	0.92**	0.91–0.94
Sensation seeking			1.25**	1.20–1.30	1.24**	1.19–1.28
Stress					1.02**	1.01–1.02
Likelihood ratio		109.85**		241.87**		290.07**
X2 Degrees of freedom		5		6		7

Note. RC = reference category; SES = score on Hollingshead’s Four Factor Index of Social Status; sensation seeking = Sensation Seeking Scale for Children Total Score at age 12; stress = Stressful Life Events Schedule cumulative severity from age 12 to age 15.

^*p <0.01.

^**p <0.001.