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Analysis of Covariance of weeks retained in treatment (n = 392).
| Source of Variance | df | Mean Square | F | p-value |
|---|---|---|---|---|
| Age | 1 | 35.39 | 2.36 | .126 |
| Annual Income | 1 | 3.56 | 0.24 | .627 |
| Gender | 1 | 3.01 | 0.20 | .655 |
| Ethnicity | 1 | 4.23 | 0.28 | .596 |
| Alcohol Dependence | 1 | 0.78 | 0.05 | .820 |
| Cocaine Dependence | 1 | 0.21 | 0.01 | .905 |
| Treatment Study | 2 | 19.86 | 1.32 | .268 |
| Treatment Condition | 1 | 279.13 | 18.57 | .001 |
| Psychiatric Severity Group | 2 | 1.01 | 0.07 | .935 |
| Treatment Condition x
Psychiatric Severity Group |
2 | 60.74 | 4.04 | .018 |
