A cluster-randomised controlled trial (cRCT) is a type of experimental study design often used in public health, education, and social sciences. In this design, groups or clusters of participants, rather than individual participants, are randomly assigned to either the intervention group or the control group. ### Key Features of a cRCT: 1. **Clusters**: Participants are grouped into clusters, which may be defined based on geographical location, organizations, schools, or other naturally occurring groups.
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