Table 2. Patterns of substance use for the full sample (at true baseline) and marijuana users and non-users (as classified at the 6-week pre-BMI assessment).
| Marijuana Users | Non-Users | ||||||
|---|---|---|---|---|---|---|---|
|
|
|
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| Full sample (N = 530) |
BMI (n = 118) |
AO (n = 116) |
Total (n = 234) |
BMI (n = 88) |
AO (n = 82) |
Total (n = 170) |
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| M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | |
| HED1 | |||||||
| Baseline | 6.67 (4.86) | 8.36 (4.81) | 8.39 (4.59) | 8.37 (4.69) | 7.33 (4.57) | 7.33 (4.57) | 6.64 (4.60) |
| Pre-BMI (6 weeks) | 6.38 (5.07) | 8.59 (4.80) | 8.47 (5.04) | 8.53 (4.91) | 5.91 (4.59) | 7.39 (4.65) | 6.62 (4.67) |
| 3 months | 5.99 (5.13) | 7.58 (5.05) | 7.86 (5.60) | 7.72 (5.33) | 5.04 (4.61) | 6.41 (5.06) | 5.68 (4.86) |
| 6 months | 5.70 (4.86) | 7.21 (5.27) | 6.96 (4.75) | 7.08 (4.99) | 4.78 (3.69) | 6.65 (5.35) | 5.69 (4.65) |
| 9 months | 5.97 (5.09) | 7.67 (5.50) | 7.14 (5.55) | 7.41 (5.52) | 5.17 (3.83) | 6.49 (5.28) | 5.81 (4.62) |
| Peak BAC1 | |||||||
| Baseline | .18 (.10) | .21 (.10) | .21 (.09) | .21 (.09) | .20 (.10) | .20 (.10) | .19 (.10) |
| Pre-BMI (6 weeks) | .18 (.10) | .22 (.09) | .22 (.10) | .22 (.09) | .17 (.09) | .22 (.10) | .19 (.10) |
| 3 months | .17 (.10) | .20 (.09) | .20 (.10) | .20 (.09) | .15 (.08) | .19 (.10) | .16 (.10) |
| 6 months | .16 (.10) | .19 (.10) | .18 (.10) | .18 (.10) | .14 (.09) | .19 (.11) | .17 (.10) |
| 9 months | .16 (.10) | .18 (.09) | .18 (.10) | .18 (.10) | .15 (.09) | .18 (.11) | .16 (.10) |
| Alcohol consequences1 | |||||||
| Baseline | 6.20 (4.58) | 7.74 (4.73) | 7.62 (4.51) | 7.68 (4.61) | 6.99 (4.38) | 6.99 (4.38) | 6.31 (4.33) |
| Pre-BMI (6 weeks) | 5.96 (5.15) | 8.09 (4.96) | 8.39 (5.04) | 8.24 (4.99) | 5.33 (4.04) | 6.32 (5.28) | 5.80 (4.69) |
| 3 months | 5.29 (5.00) | 6.33 (4.62) | 7.71 (5.77) | 7.03 (5.26) | 4.24 (3.96) | 5.72 (5.06) | 4.94 (4.55) |
| 6 months | 5.01 (5.10) | 6.22 (5.03) | 7.05 (5.71) | 6.65 (5.39) | 3.59 (4.04) | 5.85 (5.49) | 4.69 (4.92) |
| 9 months | 5.15 (5.07) | 5.89 (4.63) | 7.43 (5.49) | 6.65 (5.12) | 3.64 (3.99) | 6.12 (5.92) | 4.84 (5.15) |
| Frequency MJ use1 | |||||||
| Baseline | 5.42 (18.34) | 10.73 (30.27) | 8.79 (12.24) | 9.76 (23.06) | .70 (3.70) | .70 (3.70) | .67 (2.9) |
| Pre-BMI (6 weeks) | 7.08 (16.29) | 14.14 (19.58) | 13.19 (16.90) | 13.67 (18.26) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| 3 months | 6.25 (13.87) | 10.12 (16.02) | 10.19 (14.80) | 10.16 (15.38) | 2.09 (11.44) | 2.03 (7.58) | 2.06 (9.79) |
| 6 months | 6.01 (13.84) | 11.22 (16.01) | 8.96 (17.70) | 10.04 (16.91) | 1.78 (6.63) | 1.19 (3.81) | 1.49 (5.44) |
| 9 months | 6.56 (18.69) | 11.37 (18.53) | 10.27 (20.92) | 10.82 (19.72) | 0.96 (3.44) | 1.51 (7.00) | 1.23 (5.45) |
Note. AO = Assessment Only condition. BAC = blood alcohol concentration. BMI = Brief Motivational Intervention condition. HED = heavy episodic drinking.
1
In the past month. MJ = Marijuana