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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.