![]() ![]() ![]() Results of tests for funnel plot asymmetry should be interpreted in the light of visual inspection of the funnel plot. However, we are not aware of evidence from simulation studies that provides specific guidance on when study sizes should be considered ‘too similar’. ![]() Tests for funnel plot asymmetry should not be used if all studies are of similar sizes (similar standard errors of intervention effect estimates). 10.4.3.1 Recommendations on testing for funnel plot asymmetryĪs a rule of thumb, tests for funnel plot asymmetry should be used only when there are at least 10 studies included in the meta-analysis, because when there are fewer studies the power of the tests is too low to distinguish chance from real asymmetry. For the current version, please go to /handbook/current. ![]()
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