Evidence for risk of bias in cluster randomised trials: review of recent trials published in three general medical journals.

@article{Puffer2003EvidenceFR,
  title={Evidence for risk of bias in cluster randomised trials: review of recent trials published in three general medical journals.},
  author={Suezann Puffer and David J Torgerson and Judith Watson},
  journal={BMJ},
  year={2003},
  volume={327 7418},
  pages={785-9}
}
OBJECTIVE To examine the prevalence of a risk of bias associated with the design and conduct of cluster randomised controlled trials among a sample of recently published studies. DESIGN Retrospective review of cluster randomised trials published in the BMJ, Lancet, and New England Journal of Medicine from January 1997 to October 2002. MAIN OUTCOME MEASURES Prevalence of secure randomisation of clusters, identification of participants before randomisation (to avoid foreknowledge of… CONTINUE READING
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Evaluation of the effectiveness of an educational intervention for general practitioners in adolescent health care : randomised controlled trial

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