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Table 5 Three level multilevel model (patient within surgeon within centre)

From: Clustering in surgical trials - database of intracluster correlations

Outcome

ICC

Estimate †

95% CI*

EQ-5D 12 m

Level 2 (surgeon)

0.417

(0.000,

0.857)

 

Level 3 (centre)

0.012

(0.000,

0.003)

 

Levels 2 (surgeon) and 3 (centre)

0.029

(0.005,

0.053)

  1. CI: confidence interval; EQ-5D: EUROQOL 5D-3L; ICC: Intracluster correlation coefficient.
  2. †multilevel model using xtmixed command in Stata with no adjustment for treatment or other factors.
  3. * 95% bootstrapped (bias corrected and accelerated) confidence interval
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Trials

ISSN: 1745-6215