Table 6.
Differences in End-of-Treatment and Long-Term Outcomes for Two Definitions of Clinically-Significant Improvement.
| MTP Outcome | Carroll Definition of Improvement | Stephens Definition of Improvement | ||
|---|---|---|---|---|
| Improved (n = 105) |
Not Improved (n = 197) |
Improved (n = 27) |
Not Improved (n = 275) |
|
| # Days of MJ Use in Last Week of Treatment | 1.33 (2.22) | 4.42 (2.88)* | 0.19 (0.48) | 3.54 (3.02)* |
| % Days of MJ Abstinence (Prior 90 Days) | 81 (24) | 31 (34)* | 98 (4) | 49 (38)* |
| Max # Consecutive Days of MJ Abstinence during Treatment | 70.74 (46.62) | 21.09 (36.71)* | 113.19 (34.48) | 35.73 (43.49)* |
| ASI Drug Composite Scorea | 0.08 (0.09) | 0.19 (0.09)* | 0.01 (0.04) | 0.15 (0.10)* |
| MPS Score | 5.25 (4.50) | 8.13 (4.09)* | 0 (0) | 8.03 (4.11)* |
| ASI Psychological Composite Score | 0.12 (0.17) | 0.14 (0.19) | 0.07 (0.11) | 0.15 (0.19)* |
| Anxiety Score (STAI) | 33.75 (10.96) | 35.97 (11.09) | 30.37 (10.10) | 35.96 (11.03)* |
| Depression Score (BDI) | 7.29 (8.27) | 9.18 (7.44)* | 3.81 (4.39) | 9.62 (8.28)* |
| % Days of MJ Abstinence (Follow-Up) | 66 (32) | 36 (36)* | 86 (21) | 44 (37)* |
| MJ Yale Outcome | Carroll Definition of Improvement | Stephens Definition of Improvement | ||
| Improved (n = 58) |
Not Improved (n = 80) |
Improved (n = 12) |
Not Improved (n = 126) |
|
|
| ||||
| # Days of MJ Use in Last Week of Treatment | 0.68 (1.67) | 2.89 (2.85)* | 0.08 (0.29) | 2.06 (2.68)* |
| % Days of MJ Abstinence (Prior 90 Days) | 89 (17) | 56 (36)* | 98 (2) | 68 (34)* |
| Max # Consecutive Days of MJ Abstinence during Treatment | 39.05 (17.89) | 10.20 (12.04)* | 48.75 (10.06) | 20.55 (19.74)* |
| % MJ-Negative Urines during Treatment | 55 (39) | 14 (33)* | 63 (37) | 29 (40)* |
| Max # Consecutive Days of MJ-Negative Urines during Treatment | 2.86 (3.50) | 0.47 (1.22)* | 3.58 (2.19) | 1.32 (1.97)* |
| ASI MJ Composite Scorea | 0.11 (0.18) | 0.31 (0.28)* | 0.02 (0.08) | 0.24 (0.26)* |
| MPS Score | 2.94 (3.50) | 4.32 (3.81) | 0 (0) | 4.36 (3.62)* |
| ASI Psychological Composite Score | 0.04 (0.12) | 0.08 (0.16) | 0.01 (0.03) | 0.07 (0.15)* |
| Anxiety Score (BSI) | 0.20 (0.41) | 0.17 (0.31) | 0.15 (0.30) | 0.19 (0.38) |
| Depression Score (BSI) | 0.26 (0.43) | 0.21 (0.32) | 0.12 (0.26) | 0.26 (0.40) |
| % Days of MJ Abstinence (Follow-Up) | 86 (19) | 53 (33)* | 82 (27) | 66 (33) |
Note. Means (standard deviations) are presented. Asterisks indicate significant differences in independent-samples t-tests between “improved” and “not improved” groups within each definition. MJ = marijuana, MTP = Marijuana Treatment Project, MJ Yale = Contingency Management/MET/CBT Study, ASI = Addiction Severity Index, MPS = Marijuana Problems Scale, STAI = State Trait Anxiety Inventory, BDI = Beck Depression Inventory, BSI = Brief Symptom Inventory.
*
p < .01.