Table 2.
Primary and post-treatment outcomes by baseline marijuana use group and treatment condition
| No Pretreatment Marijuana Use | Pretreatment Marijuana Use | |||
|---|---|---|---|---|
| ST | CM | ST | CM | |
| Primary treatment outcomes | ||||
| N | 93 | 222 | 22 | 56 |
| Retention in treatment (weeks) | 5.6 (0.4) | 7.0 (0.3) | 3.7 (0.8) | 7.3 (0.5) |
| Longest duration of abstinence from cocaine, opioids and alcohol (weeks) |
2.4 (0.4) | 4.6 (0.3) | 2.5 (0.8) | 4.6 (0.5) |
| % (n) Negative samples for cocaine, opioids and alcohol |
67.5 (2.2) | 70.3 (1.6) | 64.8 (4.2) | 66.5 (0.3) |
| Long-term substance use and ASI outcomes | ||||
| Month 9 % (n) of negative samples for cocaine, opioids and alcohol (missing coded positive) % (n) with no past 30-day marijuana use |
76.3 (45) | 70.4 (100) | 76.9 (10) | 73.3 (22) |
| Month 3 | 79.6 (74) | 75.2 (167) | 45.5 (10) | 55.4 (31) |
| Month 6 | 73.1 (68) | 67.1 (149) | 40.9 (9) | 46.4 (26) |
| Month 9 | 65.6 (61) | 66.7 (148) | 40.9 (9) | 44.6 (25) |
| ASI Drug scores | ||||
| Baseline | .13 (.01) | .14 (.01) | .19 (.20) | .25 (.01) |
| Month 3 | .09 (.01) | .10 (.01) | .09 (.02) | .11 (.01) |
| Month 6 | .08 (.01) | .09 (.01) | .11 (.03) | .08 (.01) |
| Month 9 | .07 (.01) | .08 (.01) | .06 (.02) | .08 (.01) |
| ASI Psychiatric scores | ||||
| Baseline | 0.26 (0.02) | 0.26 (0.02) | 0.35 (0.06) | 0.34 (0.03) |
| Month 3 | 0.22 (0.03) | 0.17 (0.01) | 0.17 (0.05) | 0.25 (0.03) |
| Month 6 | 0.22 (0.03) | 0.17 (0.02) | 0.12 (0.05) | 0.16 (0.03) |
| Month 9 | 0.19 (0.03) | 0.13 (0.01) | 0.10 (0.05) | 0.17 (0.03) |
Note. Values represent unadjusted means (SE) unless otherwise noted. ST = Standard Treatment; CM = Contingency Management.