ArticleTrials2016
Sample size calculations for stepped wedge trials using design effects are only approximate in some circumstances.
Article in Trials, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
7 citing papers in PubMed.
- Trial
- Designing stepped wedge trials to evaluate physical activity interventions in schools: methodological considerations.The international journal of behavioral nutrition and physical activity · 2025Article
- Article
- Article
- Article
- Article
- A tutorial on sample size calculation for multiple-period cluster randomized parallel, cross-over and stepped-wedge trials using the Shiny CRT Calculator.International journal of epidemiology · 2020Article
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1 author.
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No grant is acknowledged in the PubMed record.
Abstract
unlabelledEstimation of sample size and power for stepped wedge cluster randomised trials can be determined by one of a number of related methods. These include exact analytical approaches, design effects or simulation. A recent paper compared the design effect to the analytical method. There were some differences between the two approaches. We show here that these differences occur because the design effect approach is only technically correct when there is an equal number of clusters crossing over at each step.
findingsThe design effect for the stepped wedge cluster randomised trial is only appropriate when there is an equal number of clusters switching at each step.
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