Table 1.
Variable Selection Results
| Pre-Treatment Variable | Random Forest | Elastic Net | BART | Included in Bootstep AIC? |
|---|---|---|---|---|
| Depression Severity (HDRS)a | Yes | Yes | Yes | Yes |
| Anxiety Severity (MASQ-AA) | No | Yes | No | No |
| Chronic MDD (yes/no) | No | Yes | No | No |
| Neuroticism (NEO-FFI-3)a | Yes | Yes | Yes | Yes |
| Anhedonia (SHAPS) | No | No | No | No |
| Reward Learning (PRT) | No | No | No | No |
| Cognitive Control (Flanker ACC)a | Yes | Yes | Yes | Yes |
| Gender | No | No | No | No |
| Agea | Yes | Yes | Yes | Yes |
| Marital Status | No | No | No | No |
| Employment Statusa | Yes | Yes | Yes | Yes |
| Years of Education | No | Yes | No | No |
Note. HDRS: Hamilton Depression Rating Scale (17-item)(Hamilton 1960); MASQ-AA: Mood and Anxiety Symptoms Questionnaire, Anxious Arousal subscore (Watson et al. 1995), MDD: Major Depressive Disorder; NEO-FFI-3: NEO Five-Factor Inventory – 3 (McCrae & Costa 2010); SHAPS: Snaith-Hamilton Pleasure Scale (Snaith et al. 1995); PRT: Probabilistic Reward Task (Pizzagalli et al. 2005); Flanker ACC: Flanker Interference Accuracy score (= AccuracyCompatible trials – AccuracyIncompatible trials); Higher scores indicate more interference (i.e., reduced cognitive control).
aVariables selected by BootStepAIC to be included in the final model.