Table 10.
Multiple meta-regression analysis, predicting between-study variance in multidimensional outcomes using the level of similarity between active and sham control groups for a number of selected features in large trials of psychological and behavioural interventions.
| Descriptives | |||||||
|---|---|---|---|---|---|---|---|
| Mean ES | Mean (SD) similarity rating (application mode) | Mean (SD) similarity rating (attention focus/cognitive function) | R 2 | k | |||
| −0.3 | 0.95 (1.5) | −0.26 (1.6) | 0.21 | 19 | |||
| Homogeneity analysis | |||||||
|---|---|---|---|---|---|---|---|
| Q | Df | P | T 2 | I2 | |||
| Model | 7.18 | 2 | 0.0276 | 0.01 | 72.1% | ||
| Residual | 27.53 | 16 | 0.036 | 0.03 | 41.9% | ||
| Total | 34.71 | 18 | 0.0103 | ||||
| Regression coefficients | |||||||
|---|---|---|---|---|---|---|---|
| B | SE | −95% CI | +95% CI | Z | P | Beta | |
| Constant | −0.49 | 0.13 | −0.73 | −0.24 | −3.84 | 0.0001 | 0.0 |
| Similarity: attention | 0.02 | 0.06 | −0.1 | 0.15 | 0.36 | 0.7219 | 0.06 |
| Similarity: application mode | 0.18 | 0.07 | 0.04 | 0.31 | 2.515 | 0.0109 | 0.44 |
| Method of moments random effects variance component | |||||||
| v = 0.13 | |||||||
Means and variance of the similarity ratings included in the model are provided, having a possible range of −2 (different for all studies) to 2 (similar across all studies).