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Table 3 Hypericum perforatum HAM-D pairing stepwise elimination results: comparison of final P values for final models using both large sample and permutation techniques

From: An empirical study using permutation-based resampling in meta-regression

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%

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