An intervention study where two or more groups of patients are deliberately given different treatments and neither the patient or the doctor responsible for the treatment is aware of which treatment is being administered.
A scientific study in which neither the subjects nor the researchers know which subjects are taking the drug and which are taking the placebo. This type of study is conducted to ensure objective results.
A trial in which neither the patient nor physician can distinguish between the real thing (for example a pill) and the inactive substance(the dummy pill)
an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; a double-blind procedure is used to guard against both experimenter bias and placebo effects
a clinical study of potential and marketed drugs , where neither the investigators nor the subjects know which subjects will be treated with the active principle and which ones will receive a placebo
In order to control for experimenter effects and demand characteristics, neither the subjects nor the experimenter knows which group of subjects has received which experimental treatment until after the data has been collected. This type of design is of particular use in pharmacology research when new drugs are being tested. Empirical: From the Greek en, (in), peira (trial), meaning derived from careful observations or experiments rather than from speculation or theory.
A study in which neither the study subjects (participants) nor the experimenters (researchers) know which treatment or intervention any particular participant is receiving during the study.
A research study in which neither the subject(s) nor the investigator(s) know what treatment a subject is receiving until the study is completed.
A research study in which neither the subjects nor members of the research team know which group or arm of the study the subjects are in. For example, in a double-blinded study comparing an experimental intervention with the standard intervention, neither the subjects nor members of the research team know who is receiving the experimental intervention and who is receiving the standard intervention. A study is "double-blinded" so that the expectations of the subjects and of the research team about the intervention (or non treatment or placebo) will be less likely to affect the outcome, and the results will be more likely to be unbiased. The names of the subjects and which arms of the study they are in are kept in a safe place, and will be released if necessary for the health of the subjects. A double-blind study may also be called a "double masked" study.
A research methodology used by scientists where neither the researchers (for example, doctors) nor the subjects (for example, patients) know which subjects have been given the substance being studied (for example, medicine) and which have been given an inert substance (placebo). Double-blind studies are used to develop statistics that measure the success of treatments.
A clinical trial design in which neither the participating individuals nor the study staff knows which participants are receiving the experimental drug and which are receiving a placebo (or another therapy). Double-blind trials are thought to produce objective results, since the expectations of the doctor and the participant about the experimental drug do not affect the outcome; also called double-masked study.
A method used to prevent bias in treatment studies. A study in which neither the patient nor the Doctors or nurses following him/her know whether he/she is taking the standard treatment or the new treatment.
A clinical trial design in which neither the participating individuals nor the study staff knows which participants are receiving the experimental drug or vaccine, or which are receiving the control or (another therapy) (The control is the currently-approved standard treatment for the disease or an inactive substance called a placebo.) [See Single Blind Study and Double Blind Study].
this refers to whether or not the study participants and/or the research team knows whether the participants are receiving a placebo or the experimental drug. In a blinded study, the participants do not know if they are receiving the active new drug or the placebo. In a double-blind study, neither the participants nor the researchers who administer the treatment know who is receiving the experimental drug or the placebo. In the case of medical necessity, a study can be unblinded to reveal who is and is not receiving the experimental treatment.
A clinical trial in which neither the study staff nor the participants know which participants are receiving the experimental vaccine and which are receiving placebo. Double-blind studies are thought to produce the most objective results.
A clinical trial design in which neither the patient nor the study staff know which patients are receiving the experimental drug and which are receiving a placebo (or another therapy).
A type of clinical trial study design in which the study participants and the investigators do not know the identity of the interventions (or lack of interventions) until data collection has been completed.
see Controlled trial.
A research study where neither the participants nor the study staff know which participants are receiving the experimental treatment and which ones are getting either a standard treatment or a placebo.
A controlled experiment in which neither the patient nor the physician knows whether the patient is getting one or another drug or dose.