Table 2.

The association of the original SAM motives measure at baseline with SAM use at baseline (n = 1,014)

	Model 1			Model 2
Variable	Standardized estimate	Standard error	Wald χ2	Standardized estimate	Standard error	Wald χ2
Intercept	1.66	0.11	225.17***	1.60	0.11	223.95***
Age	0.15	0.04	13.07***	0.12	0.04	7.94**
Malea	-0.17	0.04	14.61***	-0.16	0.04	14.75***
Whiteb	-0.20	0.05	13.65***	-0.19	0.05	13.63***
Asianb	-0.13	0.08	2.59	-0.14	0.08	3.28
School Bc	-0.09	0.10	0.71	-0.11	0.10	1.23
School Cc	0.03	0.05	0.37	0.04	0.05	0.71
Alcohol motivesd
Enhancement	0.07	0.06	1.22	0.00	0.06	0.00
Coping	0.12	0.06	4.87*	0.11	0.06	2.95
Social	-0.09	0.06	2.24	-0.05	0.06	0.63
Marijuana motivesd
Enhancement	0.44	0.06	46.97***	0.35	0.06	30.55***
Coping	0.19	0.06	9.88**	0.03	0.06	0.23
Social	0.01	0.06	0.01	-0.07	0.07	0.98
SAM motives
Conformity				-0.37	0.05	57.26***
Positive effects				0.09	0.06	2.67
Calm/coping				0.27	0.06	24.71***
Social				0.27	0.07	15.72***

Notes: Reference group = ^aFemale, ^bother, ^cSchool A, ^dmotives that capture the same construct are named differently on the validated measures (enhancement = positive effects, coping = calm/coping). Alcohol conformity motives and marijuana conformity motives were excluded from the analyses (see text for explanation). SAM = simultaneous alcohol and marijuana.

^*p < .05;

^**p < .01;

^***p < .001.