Cluster Randomized Trials
DOI link for Cluster Randomized Trials
Cluster Randomized Trials book
In most randomized trials, individuals are randomized to study conditions and then followed to compare their outcomes. In a cluster randomized trial (CRT), also called a group randomized trial, preexisting groups of individuals such as clinics, schools, or communities are randomized to conditions, with all individuals in the same group receiving the same treatment. After a follow-up period, outcomes are typically measured at the individual level. Examples of interventions that have been studied using a cluster randomized design include an intervention to improve the patient-care experience for cancer patients that randomized nurses , an educational intervention to promote serologic testing for hepatitis B that randomized churches , and a cervical cancer screening program in rural India that randomized villages .