Simultaneous alcohol and cannabis expectancies predict simultaneous use

Table 6 Linear regression: simultaneous alcohol and cannabis expectancies account for variance in the prediction of simultaneous alcohol and cannabis use beyond individual alcohol expectancies or cannabis expectancies.

Variable	ΔR²	R²	β	t
Simultaneous Alcohol and Cannabis Use Drinks Per Month (Log Normal; df = 2517)
Age	.005		-067	-3.66**
Gender	.001	.006	.036	1.87
AEQ	.008	.014	.167	4.85**
MEEQ	.004	.018	.065	3.39**
Simultaneous Expectancies	.020	.038	.185	7.60**
Simultaneous Alcohol and Cannabis Use Cannabis Per Month (Log Normal; df = 2552)
Age	.019		-.143	-7.12**
Gender	.000	.019	-.021	-1.09
AEQ	.002	.021	-.066	2.43*
MEEQ	.001	.022	.026	1.34
Simultaneous Expectancies	.003	.025	.069	2.59*

Note: Standardized regression coefficients (βs) derive from the step in which they are added to the equation.
*p < .05 **p < ..01 _p = .05 Cannabis per month with alcohol = Metric weight of cannabis consumed when also drinking alcohol. Drinks per month with Cannabis = Number of alcoholic drinks when also consuming cannabis AEQ = Alcohol Expectancies; MEEQ = Cannabis Expectancies.

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