Table 2.
Predictors based on variable importance in classification models of treatment (TX; control and e-cigarette treatments) as a function of RER, gender, age and time of day. Variables as defined in text.
| Model | Model parameter | Mean decrease in Gini Index |
|---|---|---|
| All | Age | 25.54 |
| RER | 23.98 | |
| Time of Day | 12.53 | |
| Gender | 11.04 | |
| Females | RER | 21.27 |
| Age | 18.74 | |
| Time of day | 9.41 | |
| AM Females | RER | 18.25 |
| Age | 17.44 | |
| PM Females | RER | 20.61 |
| Age | 10.16 | |
| Males | Age | 44.99 |
| Time of day | 11.99 | |
| RER | 8.99 | |
| AM Males | RER | 9.56 |
| Age | 19.95 | |
| PM Males | Age | 27.56 |
| RER | -3.20 |