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2.3.6. Heterogeneity analysis
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Heterogeneity among the included studies will be assessed using the chi-square and I2 tests. If I2 > 50%, the study will be considered highly heterogeneous, and a random-effects model will be used. In contrast, a fixed model will be used to analyze the data if I2 < 50%, which will indicate that there is no significant heterogeneity between the tests. When heterogeneity occurs, sensitivity analysis or meta-regression will be performed to assess the source of heterogeneity.
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