Table 4 –
Predictors of improvement for trained and untrained words. 1Variables were selected based on cross-validated R2. Statistics for each variable provide the cumulative variance explained by each variable added to the model after controlling for variables already included in the model. β and p-values were obtained by refitting the model with the chosen variables to add information regarding the directionality and strength of the relation. Hence, p-values provide additional indication of an accurate selection process but are not the original selection criterion for variable inclusion.
| Trained words | |||
|---|---|---|---|
| Variable | ΔR2 | β | p |
| Immediately After therapy | |||
| Pre-therapy score | 14.9% | −.61 | p < .0001 |
| Learning 5 trials (RAVLT) | 21.9% | .56 | p < .0001 |
| Years post onset | 5.2% | .44 | p < .0001 |
| Spelling pseudowords | 10.5% | .37 | p < .001 |
| Object naming | 9.6% | .36 | p < .01 |
| Two weeks after therapy | |||
| Years post onset | 10.1% | .48 | p < .01 |
| Digit span backward | 18.0% | .49 | p < .01 |
| Two months after therapy | |||
| Spatial span backward | 20.7% | .50 | p < .01 |
| Untrained words | |||
| Variable | ΔR2 | β | p |
| Immediately after therapy | |||
| Therapy type | 25.4% | .57 | p < .0001 |
| Pseudoword spelling | 11.1% | −.38 | p < .01 |
| Two weeks after therapy | |||
| Proactive interference (RAVLT) | 8.5% | .34 | p < .05 |
| Two months after therapy | |||
| tDCS | 10.4% | .38 | p < .05 |
| Immediate recall (RAVLT) | 6.5% | .29 | p = .0561 |