A method used to prevent bias in a clinical trial. Neither the participants nor the doctor knows who is taking the study agent and who is not. Only researchers at a central office know.
Clinical trial in which participants do not know what treatment they are receiving. The doctors and nurses treating them don't know either. Researchers keep this information secret until each patient's health status is known, usually after at least a year or more of treatments.
a form of clinical trial in which neither the physician nor the patient knows the actual treatment which any individual patient is receiving; double-blind trials are a way of minimizing the effects of the personal opinions of patients and physicians on the results of the trial