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Table 5 Design parameters from the antibiotic trial

From: Cluster randomized trials utilizing primary care electronic health records: methodological issues in design, conduct, and analysis (eCRT Study)

 

Coefficients of variation for general practice specific rates or proportions

Correlation between rates before and after intervention

 

Before intervention

After intervention

RTI consultation rate

   

All trial practices

0.27

0.26

0.83

Control trial arm

0.22

0.24

0.75

Intervention trial arm

0.31

0.28

0.89

Antibiotic prescribing rate

  

All trial practices

0.35

0.36

0.82

Control trial arm

0.31

0.36

0.79

Intervention trial arm

0.38

0.35

0.88

Proportion of consultations with antibiotic prescribed

 

All trial practices

0.20

0.20

0.91

Control trial arm

0.20

0.20

0.91

Intervention trial arm

0.20

0.20

0.91

  1. Figures are coefficients of variation of practice-specific rates or proportions and correlation coefficients between the same measures before and after intervention. RTI, respiratory tract infection.