Cluster randomised trials in the medical literature: Figure 2 long description

Figure 2. Results of a Web of Science search on: randomi* in clusters OR cluster randomi*

Three line graphs showing a roughly exponential rise in numbers of all publications, publications on methods, and reports of trials. There are similar numbers of publications on methods and reports of trials. The first four papers, earliest in 1981, are by Donner and his colleagues.

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Last updated: 6 November, 2003