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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%