Intervention study
A clinical trial in which a group of people with the same condition is separated into two groups. One group receives the intervention (such as treatment or prevention), and the other group does not. The two groups are compared at the end of the study to see whether the intervention was more effective. For example, in an intervention study of hot flashes in postmenopausal women, one group takes black cohosh (an herbal supplement), and the other group takes a placebo (sugar pill). At the end of the study, the groups are compared to see whether the women taking black cohosh had fewer hot flashes than the women taking the placebo.
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