of relating to or being an experimental procedure in which neither the subjects nor the experimenters know which subjects are in the test and control groups during the actual course of the experiments compare open label single blind. Double blind definition of or relating to an experiment or clinical trial in which neither the subjects nor the researchers know which subjects are receiving the active medication treatment etc and which are not a technique for eliminating subjective bias from the test results see more. Double blind term used to described a study in which both the investigator or the participant are blind to unaware of the nature of the treatment the participant is receiving double blind trials are thought to produce objective results since the expectations of the researcher and the participant about the experimental treatment such as a drug do not affect the outcome
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