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Hypericum perforatum HAM-D pairing stepwise elimination results: comparison of final P values for final models using both large sample and permutation techniques
| Model | Meta-regression (t-distribution), P value | Permutation test, P value |
|---|---|---|
| 1. Methodological covariates: | ||
| Appropriate randomization | 0.035 | 0.041 |
| Heterogeneity (I2) | 81% | |
| 2. Participant level and intervention level covariates: | ||
| Length of trial | 0.021 | 0.022 |
| Sex proportion (male) | 0.041 | 0.045 |
| Heterogeneity (I2) | 79% |
