Controlled Trial

(n.) = ensayo controlado
Ex: The library literature nevertheless contains diverse examples of randomised controlled trials.

Ex: The library literature nevertheless contains diverse examples of randomised controlled trials.

A method for testing therapies in which the results of a proposed treatment are compared with a standard treatment or with a placebo. In general, two similar groups of patients are used, and both favorable and unfavorable results (i.e. toxicity) are recorded. Unlike anecdotal evidence, controlled trials often form the basis for treatment recommendations

a clinical trial in which the group receiving an experimental therapy is compared to a control group that is not given the intervention being studied. In a placebo-controlled trial the control group is given an inactive substance (placebo); in an active control trial the control group is given the best existing proven therapy. Contrast with uncontrolled trial. See also placebo-controlled trial.

A control is a standard against which experimental treatments may be compared and evaluated for safety and effectiveness. In clinical trials, one group of patients may be given an experimental drug, while another group (the control group) is given either a standard treatment for the disease or a placebo.
See Also: Placebo