Baio, G;
Copas, A;
Ambler, G;
Hargreaves, J;
Beard, E;
Omar, RZ;
(2015)
Sample size calculation for a stepped wedge trial.
Trials
, 16
, Article 354. 10.1186/s13063-015-0840-9.
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Abstract
Stepped wedge trials (SWTs) can be considered as a variant of a clustered randomised trial, although in many ways they embed additional complications from the point of view of statistical design and analysis. While the literature is rich for standard parallel or clustered randomised clinical trials (CRTs), it is much less so for SWTs. The specific features of SWTs need to be addressed properly in the sample size calculations to ensure valid estimates of the intervention effect.
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