A rough guide for the interpretation of I 2 test is as follows: 0-25% (might not be significant); 25-50% (may represent moderate heterogeneity); 50-75% (may represent substantial heterogeneity) and >75% (considerable heterogeneity).
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Development and implementation of a potential coronavirus disease 2019 (COVID-19) vaccine: A systematic review and meta-analysis of vaccine clinical trials.
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