a clinical experiment in which neither the patients nor the researchers are aware of which patients are receiving the active treatment and which are receiving placebo
Participants in this type of trial are divided into two or more groups: one gets the experimental treatment; the other gets the standard treatment or a placebo. Neither the researchers nor the participants know who is taking which drug until the trial is over.
A clinical trial considered the gold standard for testing effectiveness of drugs and medicine. Neither the researcher nor the subjects taking part in the trial know whether the drug being given in any individual case is the active drug or a placebo. This kind of trial aims to make the research free from bias.
A clinical trial where neither the participant nor the investigator know which treatment the participant is receiving. The goal of this type of study is to eliminate bias in reporting results.
a clinical trial involving volunteers who take an experimental drug or a control substance. The control substance is usually a drug already approved for use in the disease, but sometimes it's a placebo. In a double-blind trial, a lab prepares the experimental and control substances and labels them so that neither the researchers nor patients know which individuals are getting the experimental drug. Only after the trial is finished do the researchers and patients learn which patients were taking the experimental drug. In HIV-related trials, the placebo is commonly replaced with some approved anti-HIV treatment. (also see clinical trial, and open label trial.)
Many clinical trials are double blind in design. This means that neither patients nor investigators/doctors know whether an individual participant is on an active drug or a placebo.
A clinical trial design in which neither the participating individuals nor the study staff know which participants are receiving the experimental treatment and which are receiving the control treatment or placebo. Double-blind trials are thought to produce objective results, since the expectations of the participants and study staff about the experimental drug do not affect the outcome.
A clinical trial in which neither the subjects nor the investigator(s) know which treatment subjects have received.