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Table 3 Ranges for interpretation of I 2 following the Cochrane Handbook for Systematic Reviews of Interventions (Version 5.0.1) [23].

From: Undue reliance on I 2 in assessing heterogeneity may mislead

0% to 40%

might not be important

30% to 60%

may represent moderate heterogeneity

50% to 90%

may represent substantial heterogeneity

75% to 100%

considerable heterogeneity