A note on sample size calculations for cluster randomised crossover trials with a fixed number of clusters

被引：5

作者：

Kelly, Thu-Lan ^{[1
]}

Pratt, Nicole ^{[1
]}

机构：

[1] Univ South Australia, Sch Pharm & Med Sci, Qual Use Med Pharm Res Ctr, Adelaide, SA 5001, Australia

来源：

STATISTICS IN MEDICINE | 2019年 / 38卷 / 18期

关键词：

cluster randomised crossover clinical trial; experimental design; sample size calculation;

D O I：

10.1002/sim.8191

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Girardeau, Ravaud and Donner in 2008 presented a formula for sample size calculations for cluster randomised crossover trials, when the intracluster correlation coefficient, interperiod correlation coefficient and mean cluster size are specified in advance. However, in many randomised trials, the number of clusters is constrained in some way, but the mean cluster size is not. We present a version of the Girardeau formula for sample size calculations for cluster randomised crossover trials when the number of clusters is fixed. Formulae are given for the minimum number of clusters, the maximum cluster size and the relationship between the correlation coefficients when there are constraints on both the number of clusters and the cluster size. Our version of the formula may aid the efficient planning and design of cluster randomised crossover trials.

引用

页码：3342 / 3345

页数：4

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