a clinical trial in which neither the participants nor the doctors know who is receiving the experimental drug and who is receiving the placebo or standard comparison treatments. This method is believed to achieve the most accurate, generalizable results because neither the doctors nor the patients can affect the observed results with their psychological biases.
neither the trial participants nor the researchers know who is receiving which drug or drug dose
A doubled-blinded trial produces more objective and unbiased results because neither the research investigators nor the study participants know who is receiving the investigational drug and who is receiving the placebo
A clinical trial in which neither the medical staff nor the person knows which of several possible therapies the person is receiving.
Double-blinded clinical trials are those in which the patients and the scientist do not know which treatment each patient is receiving. Blinding a study prevents personal bias from influencing their reactions and the study results. Treatment can be quickly identified, if necessary, by a special code. (See Single-blinded.)
A type of experiment made to test the effect of a treatment or drug. Groups of experimental and control subjects are used in which neither the subject nor the investigators know which treatment is being given to which group. * In a double-blind test of a new medication, the medication may be identified to the investigators only after the "code" for the study is allowed to be revealed. This is typically at the completion of the study.