TABLE 2.
Results of mixed model regression analyses
| Model | Term entered | dfa | F |
|---|---|---|---|
| 1 | Treatment | 2/480.138 | 11.92*** |
| Time | 2/392.051 | 1.49 | |
| Treatment × time | 4/421.200 | 1.49 | |
| 2 | Treatment | 2/366.931 | 5.55* |
| Time | 2/340.920 | 1.81 | |
| Treatment × time | 4/371.313 | 1.32 | |
| SCID history of depression (Yes–No) | 2/424.623 | 13.449*** | |
| 3 | Treatment | 2/365.912 | 4.79** |
| Time | 2/324.342 | 3.52* | |
| Treatment × time | 4/310.884 | 1.06 | |
| Smoking Status at time point (Smoking–Non-Smoking) | 1/452.391 | 7.56** | |
| 4 | Treatment | 2/372.103 | 4.18* |
| Time | 2/328.427 | 5.71** | |
| Treatment × time | 4/309.813 | 1.21 | |
| Cigarettes per day at time point | 1/456.204 | 14.94*** | |
| 5 | Treatment | 2/330.277 | 15.71*** |
| Time | 1/331.978 | 0.18 | |
| Treatment × time | 2/329.502 | 2.19 | |
| Withdrawal score at time point | 1/399.903 | 206.93*** |
DV, CES-D depressive symptoms score.
a
Degrees of freedom calculated using Satterthwaite’s approximation;
*
p <.05;
**
p <.01;
***
p <.001.