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In medicine, a stepped-wedge trial is a type of randomised controlled trial. An RCT is a scientific experiment that is designed to reduce bias when testing a new medical treatment, a social intervention, or another testable hypothesis.
In a traditional RCT, the researcher randomly divides the experiment participants into two groups at the same time:
In a SWT, a logistic constraint typically prevents the simultaneous treatment of some participants, and instead, all or most participants receive the treatment in waves or "steps".
For instance, researcher wants to measure whether teaching college students how to make several meals increased their propensity to cook at home instead of eating out.
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