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Table 7 Linear regression: simultaneous alcohol and cannabis expectancies account for variance in the prediction of days per month using alcohol and cannabis simultaneously beyond individual alcohol expectancies or cannabis expectancies.

From: Simultaneous alcohol and cannabis expectancies predict simultaneous use

Variable ΔR2 R2 β t
Days Using Alcohol and Cannabis Simultaneously (df = 2539)
   Age .014   .123 6.21**
   Gender .001 .015 -.028 -1.42
   AEQ .002 .017 .049 1.84
   MEEQ .001 .018 .046 2.39*
   Simultaneous Expectancies .017 .035 .179 6.74**
  1. Note: Standardized regression coefficients (βs) derive from the step in which they are added to the equation.
  2. *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.