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 | Â | Â | Â | Â | Â |
 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 | Â | Â | Â | Â | Â |
 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 | Â | Â | Â | Â | Â |
 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 | Â | Â | Â | Â | Â |
 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 |