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Review
. 2005 Jan 15;330(7483):142-4.
doi: 10.1136/bmj.330.7483.142.

Clustering by health professional in individually randomised trials

Katherine J Lee  1 , Simon G Thompson
Affiliations
Free PMC article
Review

Clustering by health professional in individually randomised trials

Katherine J Lee et al. BMJ. .
Free PMC article

Abstract

Patient outcomes in many randomised trials depend crucially on the health professional delivering the intervention, but the resulting clustering is rarely considered in the analysis

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Figures

Fig 1
Fig 1
Structure of imposed and natural clustering
Fig 2
Fig 2
Variability among consultants in outcome (proportion of patients offered follow up appointment) and intervention effect (odds ratio of follow up appointment in intervention group v control group) in teleconsultation trial. (One consultant had only one patient in the control arm and is not included in the intervention effect because a 95% confidence interval could not be calculated)
See this image and copyright information in PMC

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