Table 1.
Descriptive statistics for outcomes at baseline and follow-up
| Control Mean (SD)/% |
Intervention Mean (SD)/% |
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|---|---|---|---|---|
|
|
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| Outcome | Baseline | Follow up | Baseline | Follow up |
| Alcohol use frequency, 3 months | 2.68 (2.27) | 2.78 (2.33) | 2.60 (2.20) | 2.05 (2.07) |
| Alcohol use status, 30 days | ||||
| Non-drinker (%) | 31.00 | 25.58 | 28.00 | 37.89 |
| Non-heavy drinker (%) | 22.00 | 29.07 | 25.00 | 23.16 |
| Heavy drinker (%) | 30.00 | 25.58 | 27.00 | 26.32 |
| Frequent heavy drinker (%) | 17.00 | 19.77 | 20.00 | 12.63 |
| Average # drinks per day, 30 days | 2.31 (7.44) | 1.52 (4.04) | 2.24 (8.74) | 1.04 (2.31) |
| Alcohol consequences | 7.12 (6.28) | 5.65 (5.77) | 6.49 (5.70) | 5.48 (6.11) |
| Alcohol importance ruler | 5.81 (4.03) | 5.52 (4.11) | 5.59 (4.04) | 6.07 (4.06) |
| Alcohol readiness ruler | 5.52 (4.02) | 5.66 (4.28) | 5.86 (3.90) | 6.28 (3.94) |
| Alcohol confidence ruler | 5.84 (4.05) | 6.07 (4.03) | 6.35 (3.75) | 7.13 (3.66) |
| Marijuana use frequency, 3 months | 4.92 (2.86) | 4.14 (2.98) | 4.60 (2.76) | 3.99 (3.02) |
| Marijuana importance ruler | 3.88 (4.22) | 4.07 (4.18) | 3.45 (4.20) | 4.21 (4.34) |
| Marijuana readiness ruler | 4.09 (4.32) | 4.30 (4.22) | 3.38 (3.96) | 4.03 (4.34) |
| Marijuana confidence ruler | 4.07 (4.31) | 4.44 (4.26) | 3.79 (4.13) | 4.77 (4.53) |
| Other drug use frequency, 3 months | 0.36 (0.64) | 0.26 (0.59) | 0.62 (1.15) | 0.45 (0.94) |
| Other drug importance ruler | 6.49 (4.27) | 6.48 (4.37) | 5.79 (4.35) | 7.37 (3.89) |
| Other drug readiness ruler | 6.85 (4.13) | 6.67 (4.25) | 5.91 (4.24) | 7.69 (3.61) |
| Other drug confidence ruler | 7.04 (4.12) | 6.60 (4.39) | 5.87 (4.21) | 7.67 (3.57) |
| Proportion of unprotected sexual events, 3 months | 0.44 (0.45) | 0.41 (0.47) | 0.47 (0.46) | 0.42 (0.45) |
| # sex partners, 3 months | 2.36 (2.71) | 2.17 (3.82) | 2.54 (3.08) | 2.56 (3.43) |
| Condom self-efficacy | 2.18 (0.70) | 2.31 (0.63) | 2.15 (0.70) | 2.44 (0.56) |
| Condom importance ruler | 6.25 (4.06) | 6.05 (4.14) | 5.81 (4.31) | 5.92 (4.24) |
| Condom readiness ruler | 6.12 (4.07) | 6.21 (4.07) | 5.96 (4.14) | 5.86 (4.25) |
| Condom confidence ruler | 6.16 (4.02) | 6.04 (4.02) | 5.90 (4.21) | 5.69 (4.23) |
Notes. Past 3 month substance use: 0=never, 1=less than once per month, 2=once a month, 3=2–3 times a month, 4=once a week, 5=2–3 times a week, 6=4–5 times a week, 7=every day. Rulers: 0=not at all to 10=extremely. Condom self-efficacy: 1=strongly agree to 4 = strongly disagree. The only statistically significant baseline differences between the intervention and control groups are for frequency of other drug use (p = 0.0497) and other drug confidence ruler (p = .048).