How do you interpret heterogeneity i2?

A rough guide to interpretation is as follows:

  1. 0% to 40%: might not be important;
  2. 30% to 60%: may represent moderate heterogeneity*;
  3. 50% to 90%: may represent substantial heterogeneity*;
  4. 75% to 100%: considerable heterogeneity*.

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