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Table 6 Summary of results for the Ulcer case study (n=233)

From: Recommendations for the analysis of individually randomised controlled trials with clustering in one arm – a case of continuous outcomes

Model

Treatment estimate

Standard error

Residual variance

Random variance

Control variance

ICC

Ignore clustering

5.88

2.37

325.66

   

Random effects

      

Individual clusters of size 1

6.09

2.66

314.70

11.58

 

0.0355a

One large cluster

6.12

4.64

319.32

14.19

 

0.0425a

Artificial-clusters

6.08

2.92

315.18

11.96

 

0.0366a

Partially clustered

      

Individual clusters of size 1

6.12

2.72

319.32

14.19

 

0.0425b

One large cluster

6.12

2.72

319.32

14.19

 

0.0425b

Artificial-clusters

6.12

2.72

319.32

14.19

 

0.0425b

Heteroskedastic

      

Individual clusters of size 1

6.11

2.70

330.21

13.47

308.41

0.0207b

One large cluster

6.11

2.70

330.21

13.47

308.41

0.0207b

Artificial-clusters

6.11

2.70

330.21

13.47

308.41

0.0207b

  1. aICC across both arms of the trial
  2. bICC in the intervention arm only