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Table 1 Properties of measures of heterogeneity.

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

Measure measured on increasing with
  scale range number of studies in meta-analysis precision (size of studies)
Q absolute [0, ∞) yes yes
I 2 percent [0, 100%] no yes
τ, τ 2 outcome [0, ∞) no no
H, H 2 absolute [1, ∞) no yes
R, R 2 absolute [1, ∞) no yes