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Blind Double Blind

Or the patients and people offering the intervention were blinded etc.

Blind double blind. Or the patients and outcome assessors were blinded. Double blind definition is 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. A double blind experiment can be set up when the lead experimenter sets up the study but then has a colleague such as a graduate student collect the data from participants.

A double blind study or trial especially in medicine is one in which two groups of people are.

Source : pinterest.com