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Table 1 Characteristics of articles included in analysis (N = 186)

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

  N %
Multiple centers 87 46.7
Multiple therapists 145 78.0
Reported any clustering analysis 40 21.5
Reported inclusion of a statistician on study team 91 48.9
Report inclusion of a clinical trials methodologist or epidemiologist on study team 83 44.6
Reported inclusion of either specialist 109 58.6
Reported inclusion of both specialists 65 34.9
Reported positive outcome 94 50.5
Specified null hypothesis but reported positive outcome 31 16.7
Reported negative outcome 6 3.2
Reported neutral outcome 86 46.2
Sample size (mean, SD) 185 200.5, 344.8