Based on the Cochrane Handbook, if I 2 <30%, heterogeneity might not be significant, when 30%<I 2 <50%, moderate heterogeneity may be present, when 50%<I 2 <75% substantial heterogeneity may be present and if I 2 >75% considerable heterogeneity is present.
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New technologies promoting active upper limb rehabilitation after stroke: an overview and network meta-analysis.
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