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Table 5 Three level multilevel model (patient within surgeon within centre)
Clustering in surgical trials - database of intracluster correlations
EQ-5D 12 m
Level 2 (surgeon)
Level 3 (centre)
Levels 2 (surgeon) and 3 (centre)
CI: confidence interval; EQ-5D: EUROQOL 5D-3L; ICC: Intracluster correlation coefficient.
multilevel model using xtmixed command in Stata with no adjustment for treatment or other factors.
* 95% bootstrapped (bias corrected and accelerated) confidence interval
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