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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

Ā 

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

Ā 

Impact factor

1.1(0.5-2.3), 0.89

Ā Ā Ā 

Outcome

0.8(0.3-1.7), 0.51

0.8(0.3-1.7), 0.50

Ā Ā 

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

Ā 

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

Ā Ā Ā 

Outcome

0.8(0.4-1.7), 0.49

0.8(0.3-1.6), 0.48

Ā Ā 

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

Ā 

Impact factor

1.2(0.6-2.7), 0.58

1.3(0.6-2.7), 0.55

Ā Ā 

Outcome

0.8(0.4-1.8), 0.60

Ā Ā Ā