Table 2. Mean Covariate Adjusted Posttest Effect Sizes and 95% Confidence Intervals for Each Treatment Category versus Available Comparison Conditions.
| Treatment Combination | k | n | Mean | 95% CI |
|---|---|---|---|---|
| Behavioral Therapy | ||||
| vs. CBT | 1 | 1 | −.67 | (−1.35, .02) |
| vs. Family | 1 | 2 | −.01 | (−5.56, 5.53) |
| vs. MET/CBT | 1 | 2 | .36 | (−1.45, 2.16) |
| vs. Practice as usual | 1 | 6 | −.01 | (−.45, .43) |
| vs. All of the above | 4 | 11 | .00 | (−.52, .53) |
| Family Therapy | ||||
| vs. Behavioral | 1 | 2 | .01 | (−5.53, 5.56) |
| vs. CBT | 3 | 12 | .53 | (−.30, 1.36) |
| vs. Group and mixed counseling | 7 | 24 | .32* | (.18, .47) |
| vs. MET/CBT | 5 | 10 | .11 | (−.32, .55) |
| vs. PET | 5 | 14 | .45* | (.02, .88) |
| vs. Practice as usual | 4 | 26 | .09 | (−.27, .46) |
| vs. All of the above | 25 | 88 | .26* | (.13, .38) |
| Group and Mixed Counseling | ||||
| vs. CBT | 1 | 4 | −.62 | (−2.21, .96) |
| vs. Family | 7 | 24 | −.32* | (−.47, −.18) |
| vs. MET | 1 | 8 | −.45 | (−1.26, .36) |
| vs. MET/CBT | 5 | 5 | .20 | (−.14, .55) |
| vs. PET | 3 | 4 | −.16 | (−.36, .04) |
| vs. No treatment | 1 | 25 | −.40 | (−1.38, .58) |
| vs. All of the above | 18 | 70 | −.10 | (−.28, .07) |
| vs. All treatments (excluding no treatment) | 17 | 45 | −.10 | (−.28, .08) |
| Cognitive Behavioral Therapy (CBT) | ||||
| vs. Behavioral | 1 | 1 | .67 | (−.02, 1.35) |
| vs. Family | 3 | 12 | −.53 | (−1.36, .30) |
| vs. Group and mixed counseling | 1 | 4 | .62 | (−.96, 2.21) |
| vs. MET/CBT | 2 | 6 | −.59 | (−3.07, 1.88) |
| vs. PET | 3 | 7 | .16 | (−.74, 1.05) |
| vs. Practice as usual | 2 | 10 | .51 | (−2.25, 3.27) |
| vs. No treatment | 2 | 3 | .49 | (−3.62, 4.59) |
| vs. All of the above | 14 | 43 | −.02 | (−.35, .31) |
| vs. All treatments (excluding no treatment) | 12 | 40 | −.07 | (−.43, .28) |
| Motivational Enhancement Therapy (MET) | ||||
| vs. Group and mixed counseling | 1 | 8 | .45 | (−.36, 1.26) |
| vs. PET | 5 | 20 | .01 | (−.33, .36) |
| vs. Skills | 1 | 2 | .22 | (−2.45, 2.89) |
| vs. Practice as usual | 1 | 5 | .18 | (−.69, 1.05) |
| vs. No treatment | 9 | 35 | .23* | (.13, .32) |
| vs. All of the above | 17 | 70 | .17* | (.07, .27) |
| vs. All treatments (excluding no treatment) | 8 | 35 | .11 | (−.11, .32) |
| MET/CBT | ||||
| vs. Behavioral | 1 | 2 | −.36 | (−2.16, 1.45) |
| vs. CBT | 2 | 6 | .59 | (−1.88, 3.07) |
| vs. Family | 5 | 10 | −.11 | (−.55, .32) |
| vs. Group and mixed counseling | 5 | 5 | −.20 | (−.55, .14) |
| vs. PET | 1 | 2 | .33 | (−2.96, 3.62) |
| vs. All of the above | 14 | 25 | −.07 | (−.29, .14) |
| Psychoeducational Therapy (PET) | ||||
| vs. CBT | 3 | 7 | −.16 | (−1.05, .74) |
| vs. Family | 5 | 14 | −.45* | (−.88, −.02) |
| vs. Group and mixed counseling | 3 | 4 | .16 | (−.04, .36) |
| vs. MET | 5 | 20 | −.01 | (−.36, .33) |
| vs. MET/CBT | 1 | 2 | −.33 | (−3.62, 2.96) |
| vs. No treatment | 2 | 8 | .00 | (−1.25, 1.24) |
| vs. All of the above | 19 | 55 | −.15 | (−.32, .01) |
| vs. All treatments (excluding no treatment) | 17 | 47 | −.16 | (−.34, .01) |
| Pharmacological Treatment | ||||
| vs. Placebo | 7 | 13 | .30 | (−.19, .79) |
| Skills Training | ||||
| vs. MET | 1 | 2 | −.22 | (−2.89, 2.45) |
| Practice as Usual | ||||
| vs. Behavioral | 1 | 6 | .01 | (−.43, .45) |
| vs. CBT | 2 | 10 | −.51 | (−3.27, 2.25) |
| vs. Family | 4 | 26 | −.09 | (−.46, .27) |
| vs. MET | 1 | 5 | −.18 | (−1.05, .69) |
| vs. All of the abovea | 7 | 43 | −.13 | (−.35, .09) |
| No Treatment | ||||
| vs. CBT | 2 | 3 | −.49 | (−4.59, 3.62) |
| vs. Group and mixed counseling | 1 | 25 | .40 | (−.58, 1.38) |
| vs. MET | 9 | 35 | −.23* | (−.32, −.13) |
| vs. PET | 2 | 8 | .00 | (−1.24, 1.25) |
| vs. All of the above | 14 | 71 | −.20* | (−.31, −.10) |
Notes: k = number of treatment-comparison group pairs; n = number of effect sizes. All estimates adjusted for baseline group equivalence and pretest differences, pretest-posttest time interval, attrition rate, substance use outcome type (alcohol, marijuana, other drugs), baseline substance use severity, gender mix, race/ethnicity mix, and mean age of the participant sample.
a
Totals do not sum to 43 and 7 because one treatment comparison group pair contributed 4 effect sizes that compared a combined CBT and family therapy program with practice as usual. That k = 1, n = 4 case is only represented once in the “all of the above” category.
*
p< .05