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Table 7 Multivariable analysis of any use of clustering analysis after elimination of collinear variables, stepwise deletion for each specialist variable

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

  Model 1 OR(CI),Pvalue Model 2 OR(CI),Pvalue Model 3 OR(CI),Pvalue Model 4 OR(CI),Pvalue
Epidemiologist/Methodologist 3.3(1.0-10.6), 0.04 3.3(1.0-10.7), 0.04 3.3(1.0-10.5), 0.04 3.3(1.0-10.4), 0.04
Sample size 1.0(1.0-1.0), 0.06 1.0(1.0-1.0), 0.05 1.0(1.0-1.0), 0.06 1.0(1.0-1.0), 0.07
Journal 1.1(0.8-1.6), 0.50 1.1(0.8-1.6), 0.46 1.1(0.8-1.6), 0.55  
Impact factor 1.1(0.5-2.3), 0.89    
Outcome 0.8(0.3-1.7), 0.51 0.8(0.3-1.7), 0.50   
Biostatistician 1.5(0.6-4.1), 0.40 1.5(0.6-4.1), 0.40 1.5(0.6-4.0), 0.42  
Sample size 1.0(1.0-1.0), 0.03 1.0(1.0-1.0), 0.03 1.0(1.0-1.0), 0.04 1.0(1.0-1.0), 0.04
Journal 1.2(0.8-1.6), 0.36 1.2(0.8-1.7), 0.28 1.2(0.8-1.6), 0.34 1.2(0.9-1.5), 0.29
Impact factor 1.2(0.6-2.5), 0.61    
Outcome 0.8(0.4-1.7), 0.49 0.8(0.3-1.6), 0.48   
Any specialist 6.7(0.8-57.3), 0.08 6.9(0.8-58.8), 0.08 7.0(0.8-61.0), 0.08 7.0(0.8-60.7), 0.08
Sample size 1.0(1.0-1.0), 0.03 1.0(1.0-1.0), 0.04 1.0(1.0-1.0), 0.03 1.0(1.0-1.0), 0.04
Journal 1.2(0.8-1.6), 0.39 1.1(0.8-1.6), 0.44 1.2(0.8-1.6), 0.33  
Impact factor 1.2(0.6-2.7), 0.58 1.3(0.6-2.7), 0.55   
Outcome 0.8(0.4-1.8), 0.60