Table 4.
Percentage of days in past month that alcohol use, heavy alcohol use, and marijuana use on the Time Line Follow-Back (TLFB) interview by treatment condition.
| TLFB variable | Baseline |
3 month follow-up |
6 month follow-up |
1 year follow-up |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EXP |
TAU |
EXP |
TAU |
EXP |
TAU |
EXP |
TAU |
|||||||||
| n | M (SD) | n | M (SD) | n | M (SD) | n | M (SD) | n | M (SD) | n | M (SD) | n | M (SD) | n | M (SD) | |
| Alcohol use | 61 | 0.07 (0.17) | 49 | 0.09 (0.20) | 58 | 0.05 (0.14) | 39 | 0.04 (0.05) | 55 | 0.02 (0.04) | 41 | 0.03 (0.06) | 55 | 0.04 (0.06) | 38 | 0.05 (0.12) |
| Heavy alcohol use | 61 | 0.06 (0.17) | 49 | 0.08 (0.20) | 58 | 0.01 (0.04) | 39 | 0.02 (0.04) | 55 | 0.01 (0.02) | 41 | 0.02 (0.05) | 55 | 0.02 (0.04) | 38 | 0.04 (0.11) |
| Marijuana use | 61 | 0.36 (0.38) | 49 | 0.39 (0.38) | 58 | 0.24 (0.34) | 39 | 0.39 (0.44) | 55 | 0.28 (0.37) | 41 | 0.40 (0.42) | 55 | 0.43 (0.42) | 38 | 0.42 (0.41) |
EXP: experimental treatment condition; TAU: treatment-as-usual condition; M = unadjusted mean; SD = standard deviation.