A clinical trial in which two therapies are tested. Patients are randomly assigned to one treatment or another. Efforts are made to ensure the balance of important clinical factors between the two groups.
A scientific study to compare different medical treatments. In these studies, patients are assigned to the different treatment groups by chance. This design allows for the unbiased comparison of the treatments. If the study is also 'double-blinded' neither the patients nor the researchers know who is receiving the treatments under study.
A clinical trial in which subjects have been randomly assigned to the various groups in the study.