Table 5.
Multiple meta-regression analysis, predicting between-study variance in unidimensional outcomes using the level of similarity between active and sham control groups for a number of selected features in other manual therapy trials.
| Descriptives | |||||||
|---|---|---|---|---|---|---|---|
| Mean ES | Mean (SD) similarity rating (number of sessions) | Mean (SD) similarity rating (efficacy information) | Mean (SD) similarity rating (environment) | R 2 | k | ||
| −0.72 | 1.81 (0.75) | 0.58 (0.85) | 1.61 (0.62) | 0.1631 | 31 | ||
| Homogeneity analysis | |||||||
|---|---|---|---|---|---|---|---|
| Q | Df | P | T 2 | I2 | |||
| Model | 5.35 | 3 | 0.1482 | 0.00 | 43.9% | ||
| Residual | 27.43 | 27 | 0.4408 | 0.00 | 1.6% | ||
| Total | 32.78 | 30 | 0.3324 | ||||
| Regression coefficients | |||||||
|---|---|---|---|---|---|---|---|
| B | SE | −95% CI | +95% CI | Z | P | Beta | |
| Constant | −1.83 | 0.63 | −3.07 | −0.59 | −2.9 | 0.0038 | 0.00 |
| Similarity: environment | 0.52 | 0.26 | 0.01 | 1.03 | 2.0 | 0.0457 | 0.36 |
| Similarity: efficacy information | 0.17 | 0.19 | −0.19 | 0.54 | 0.92 | 0.3578 | 0.16 |
| Similarity: number of sessions | 0.1 | 0.22 | −0.33 | . 52 | 0.44 | 0.65 | 0.08 |
| Method of moments random effects variance component | |||||||
| v = 0.64 | |||||||
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).