Stepped-Wedge Trials

Stepped-wedge cluster-randomised controlled trials (SWTs) are used in a wide range of areas of public health, as well as other areas of public policy such as education and international development. SWTs can be thought of as a modified crossover design as the clusters are in both treatment arms at different times. All clusters start in the control arm and the intervention is introduced by random allocation and at regular intervals either to one cluster at a time or in small groups of clusters, until all clusters are eventually receiving the intervention.

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Key Resources To Learn About Stepped-wedge Trials


On Sept 22nd, 2015, LSHTM hosted a Stepped-wedge Trial scientific symposium that featured leading speakers on the topic and a panel discussion.

LSHTM’s Stepped-wedge Trial Symposium