double-blind study

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dou·ble-blind stud·y

a study in which neither the patients, the experimenter, nor any other assessor of the results, knows which participants are subject to which procedure, thus helping to ensure any biases or expectations will not influence results.
See also: double-blind experiment.
Farlex Partner Medical Dictionary © Farlex 2012

double-blind study

A study in which neither the subject nor the investigator nor the research team interacting with the subject or data during the trial knows what treatment a subject is receiving (e.g., active or placebo).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

dou·ble-blind stud·y

(dŭbĕl-blind stŭdē)
Study in which neither the patients, the experimenter, nor any other assessor of the results, knows which participants are subject to which procedure, thus helping to ensure that any biases or expectations will not influence results.
Medical Dictionary for the Dental Professions © Farlex 2012