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Table 6 Multivariable analysis of any use of clustering analysis, stepwise deletion

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 Model 5 OR(CI),Pvalue Model 6 OR(CI),Pvalue
Any specialist 3.9(0.3-60.3), 0.32 3.5(0.3-40.8), 0.32 3.5(0.3-40.8), 0.32 3.6(0.3-42.5), 0.31 3.7(0.3-42.9), 0.30  
Biostatistician 0.9(0.3-2.8), 0.84      
Epidemiologist/Methodologist 2.0(0.5-8.1), 0.32 2.1(0.5-8.0), 0.29 2.1(0.5-8.1), 0.28 2.1(0.5-7.8), 0.29 2.0(0.5-7.7), 0.30 3.3(1.0-10.4), 0.04
Sample size 1.0(1.0-1.0), 0.05 1.0(1.0-1.0), 0.05 1.0(1.0-1.0), 0.05 1.0(1.0-1.0), 0.06 1.0(1.0-1.0), 0.06 1.0(1.0-1.0), 0.07
Journal 1.1(0.8-1.6), 0.55 1.1(0.8-1.6), 0.54 1.1(0.8-1.6), 0.50 1.1(0.8-1.6), 0.57   
Impact factor 1.1(0.5-2.4), 0.84 1.1(0.5-2.4), 0.85     
Outcome 0.8(0.3-1.8), 0.58 0.8(0.3-1.8), 0.55 0.8(0.3-1.7), 0.54