Skip to main content

Table 2 Effects of purchasing marijuana, both alcohol and marijuana, or neither at baseline on follow-up outcomes†

From: The effects of purchasing alcohol and marijuana among adolescents at-risk for future substance use

 

Purchased only marijuana

Purchased alcohol & marijuana

Non-purchaser

F (df = 2, 153)

P

(n = 76)

(n = 33)

(n = 49)

 

Mean/SD (%)

Mean/SD (%)

Mean/SD (%)

Alcohol use & consequences

     

 Any alcohol in the past 30 days^

2.36 (1.44)

3.61 (1.58)

2.63 (1.52)

5.98

0.003

 Heavy drinking in the past 30 days

1.71 (1.29)

2.58 (1.73)

1.65 (1.28)

4.22

0.017

 Drinks per drinking day

2.24 (2.75)

3.98 (2.88)

2.07 (2.06)

5.73

0.004

 Number of drinks on max occasion

3.55 (4.84)

7.09 (6.04)

3.63 (4.62)

5.07

0.007

 Alcohol-related consequences^^

1.08 (1.83)

1.12 (1.82)

0.78 (1.43)

0.75

0.472

 Time spent around teens who drink

2.75 (0.88)

3.24 (0.87)

2.94 (0.85)

2.51

0.085

Marijuana or other drug use & consequences

     

 Any marijuana use in the past 30 days

3.04 (2.35)

3.09 (2.38)

2.27 (1.78)

2.43

0.091

 Marijuana-related consequences

0.72 (1.65)

1.15 (1.72)

0.41 (1.21)

2.21

0.113

 Time spent around teens who use marijuana

3.03 (0.86)

3.15 (0.94)

3.10 (0.96)

0.01

0.995

 Prescription drug misuse

7.89

12.12

6.12

1.51

0.541

 Time spent around teens who use other illegal drugs

1.79 (0.96)

2.00 (1.09)

1.86 (0.94)

0.42

0.658

GAIN past year

1.07 (0.70)

1.00 (0.79)

0.78 (0.62)

3.14

0.046

Intentions to use

     

 Intention to use alcohol

2.68 (1.02)

2.91 (0.98)

2.55 (0.89)

1.38

0.255

 Intention to use marijuana

2.57 (1.02)

2.45 (1.12)

2.04 (1.06)

4.35

0.015

Resistance self-efficacy

     

 Resistance self-efficacy - alcohol

11.40 (3.61)

11.36 (3.63)

12.16 (3.78)

0.91

0.404

 Resistance self-efficacy - marijuana

11.79 (4.05)

11.76 (3.99)

13.29 (3.88)

2.38

0.096

  1. †Models control for age and intervention; ^A mean of 2.36 for any alcohol use in the past 30 days can be interpreted as approximately 1.5 days of use. Similar interpretations can be extended to heavy drinking; ^^A mean consequence score of 1.08 can be interpreted as experiencing approximately one consequence.
  2. Note: The table presents raw means and standard deviations (SD). The reported p-values are the overall p-value for the main effect of purchasing status from the multivariate regression models.