Table 4.
Top predictors used in node splitting in the forest and how often they were used to split a tree in the forest.
| VARIABLE in COMBINE | Number of times as splitters1 | Available in PREDICT |
|---|---|---|
| CDA prior to treatment | 300 | Yes |
| Age | 300 | Yes |
| Drinking goal | 229 | Yes |
| Baseline trajectory of heavy drinking | 125 | No |
| AASE total confidence score | 105 | Yes |
| Self-report ordinal health measure | 105 | No |
| POMS fatigue scale | 87 | No |
| Baseline trajectory of any drinking | 79 | No |
| AASE total temptation score | 51 | Yes |
| OCDS total score | 51 | Yes |
| WHO QoL psychological domain | 45 | Yes |
| AASE confidence: withdrawal/urge | 39 | Yes |
| Family history: 2 or more members | 38 | Yes |
| POMS depression scale | 36 | No |
| Perceived stress score | 36 | Yes2 |
| Potassium | 36 | No2 |
| Baseline smoking (yes/no) | 36 | Yes2 |
| AST(SGOT) | 36 | Yes2 |
1
A predictor can be used more than once in splitting the nodes of a tree in the forest.
2
These predictors were not used in the external validation logistic regression analyses due to different ranges or categories between the two data sets.