Table 2.
Relation of Baseline Anhedonia to Outcome in the NIDA Cocaine Collaborative Study
| Predictor | F | DF | p | Effect Size (d) |
|---|---|---|---|---|
| Model with anhedonia and covariates | ||||
| Baseline BDI anhedonia scale | 9.4 | 1, 458 | .002 | .29 |
| Site | 5.4 | 4, 458 | <.001 | .43 |
| Treatment Group | 3.4 | 3, 458 | .018 | .30 |
| Socialization Scale | 3.9 | 1, 458 | .05 | .18 |
| Baseline cocaine use (past month) | 2.0 | 1, 458 | .15 | .13 |
| Model with anhedonia, Revised BDI, and covariates | ||||
| Baseline BDI anhedonia scale | 4.7 | 1, 457 | .03 | .20 |
| BDI total score (revised) | .25 | 1, 457 | .62 | .06 |
| Site | 5.3 | 4, 457 | <.001 | .43 |
| Treatment group | 3.4 | 3, 457 | .017 | .29 |
| Socialization Scale | 4.1 | 1, 457 | .04 | .20 |
| Baseline cocaine use (past month) | 1.9 | 1, 457 | .17 | .06 |
Note. Treatment groups consist of group drug counseling (GDC), individual drug counseling plus GDC, cognitive therapy plus GDC, supportive-expressive dynamic therapy plus GDC. BDI = Beck Depression Inventory – I.