The CONSORT statement for cluster randomised trials

Marion Kay Campbell, Diana R. Elbourne, Douglas G. Altman

Research output: Contribution to journalArticle

22 Citations (Scopus)


With the publication of the CONSORT statement there is now increased awareness of the need to adequately report the findings of randomised controlled trials. The CONSORT statement includes a checklist of items that should be addressed in the trial report. The original CONSORT statement was developed to ensure the appropriate reporting of parallel group randomised controlled trials in which individual participants are allocated to different intervention groups. In cluster randomised trials, however, groups of participants, rather than individuals, are randomly allocated to study groups. The process of allocating groups of participants raises additional reporting considerations and led to the publication of an extension to the CONSORT statement specifically for cluster randomised trials. In this paper we review the CONSORT extension to cluster randomised trials, outlining the special features of the cluster randomised trial which must be considered.

Original languageEnglish
Pages (from-to)28-31
Number of pages4
JournalMedicina Clínica
Issue numberSuppl. 1
Publication statusPublished - 2005

Bibliographical note

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  • randomised controlled trials
  • reporting standards
  • cluster randomisation
  • group allocation
  • reporting checklist


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