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Table 2 Methods used to account for clustering (N = 40*)

From: Use of clustering analysis in randomized controlled trials in orthopaedic surgery

Method N (%)
Stratified randomization 23 (57.5)
Cluster randomization 7 (17.5)
GEE or controlled variable 9 (22.5)
Stratified analysis 8 (20.0)
Other 1 (2.5)
  1. *6 studies used two or more methods to account for clustering.