A study in which researchers compare the effects of a treatment in a group of subjects against another group or groups taking either another treatment or no treatment. Controlled studies are much more effective than uncontrolled studies , and the best type of controlled study is a double-blind placebo-controlled study .
- Health Library
The more you know about your health, the better prepared you are to make informed healthcare decisions. Our health library gives you the information you need to take charge of your health.