Presents sample size methodology for split-plot factorial longitudinal cluster randomised trials with continuous outcomes by showing power depends on standard results from individual and longitudinal cluster trial designs.
The 2 × 2 cluster randomized controlled factorial trial design is mainly used for efficiency and to explore intervention interactions: a systematic review
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Sample size calculations for multilevel factorial longitudinal cluster randomised trials
Presents sample size methodology for split-plot factorial longitudinal cluster randomised trials with continuous outcomes by showing power depends on standard results from individual and longitudinal cluster trial designs.