Table 3. Significant Predictors and Moderators of Dropout in CBTF2F and CBT4BN (N = 160).
| Survival model | Variable | HR | 95% CI | FDR p | |
|---|---|---|---|---|---|
| Univariable | Predictors | Age | 0.98* | 0.96, 1.00 | |
| College education | 0.55*** | 0.39, 0.78 | |||
| Age of BN onset | 0.96* | 0.93, 0.99 | |||
| BMI | 1.03† | 0.99, 1.06 | |||
| TCI Novelty-seeking | 1.01** | 1.00, 1.02 | |||
| TCI Self-transcendence | 1.01† | 1.00, 1.02 | |||
| Previous CBT experience | 1.35† | 0.92, 1.97 | |||
| Nonpreferred treatment format | 1.69** | 1.19, 2.40 | |||
| Moderators | Employed | 0.49† | 0.23, 1.03 | ||
| Number of children | 1.40† | 0.95, 2.07 | |||
| Purging | 1.01† | 1.00,1.01 | |||
| Multivariable | Predictors | College education | 0.55** | 0.37, 0.81 | 0.01* |
| BMI | 1.02* | 1.00, 1.08 | 0.07 | ||
| TCI Novelty-seeking | 1.02** | 1.01, 1.03 | 0.01* | ||
| Previous CBT experience | 1.77** | 1.16, 2.71 | 0.02* | ||
| Nonpreferred treatment format | 1.95** | 1.28, 2.96 | 0.01* | ||
| Moderators | Employed | 0.36* | 0.17, 0.80 | 0.02* |
Note:
†
p < 0.15
*
p < 0.05
**
p < 0.01
***
p < 0.001.
All analyses are adjusted for treatment site. Post hoc probing with a stratified analysis showed that the moderator of employment status was not significantly associated with dropout in either treatment arm (ps > 0.05). BMI = body mass index. CBT = cognitive-behavioral therapy. CBTF2F = traditional face-to-face group CBT. CBT4BN = Internet-based group CBT. BN = bulimia nervosa. TCI = Temperament and Character Inventory.