Definitions for "Controlled study"
A study in which there is a "control" group. This can be a group that is receiving a placebo (see placebo) or a conventional or standard treatment that is being compared with a new treatment. In a case-control study, the "control" group consists of people who do not have the condition being studied, and the "case" group consists of people who do have the condition.
A study in which an investigational drug is compared with a treatment that has known effects.  The control group may receive no treatment, standard treatment, or placebo.
A study in which a test treatment is compared with a treatment that has known effects. The control group may receive no treatment, standard treatment (which may be another medicine or another approach to care), or placebo (sugar pill.) Close Window