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Stat Med. 1992 Apr;11(6):743-50.

Sample size requirements for stratified cluster randomization designs.

Author information

Department of Epidemiology and Biostatistics, University of Western Ontario, London, Canada.

Erratum in

  • Stat Med 1997 Dec 30;16(24):2927-8.


Sample size requirements are provided for designs of studies in which clusters are randomized within each of several strata, where cluster size itself may be a stratifying factor. The approach generalizes a formula derived by Woolson et al., which provides sample size requirements for the Cochran-Mantel-Haenszel statistic. Issues of data analysis are also discussed.

[Indexed for MEDLINE]

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