Wongsai. Investigation: Noppachai Wongsai. Methodology: Teerawat Simmachan, Rattana Lerdsuwansri. Project administration: Sangdao Wongsai. Resources: Sangdao Wongsai. Software: Noppachai Wongsai ... . Supervision: Sangdao Wongsai. Validation: Sangdao Wongsai. Visualization: Noppachai Wongsai. tana Lerdsuwansri. Rattana Lerdsuwansri. Writing – original draft: Teerawat Simmachan, Noppachai Wongsai
Meta-analysis has developed to be a most important tool in evaluation research. Heterogeneity is an issue that is present in almost any meta-analysis. However, the magnitude of heterogeneity differs across meta-analyses. In this respect, Higgins’ \(I^2\) has emerged to be one of the most used and, potentially, one of the most useful measures as it provides quantification of the...