A study that is set up so that participants do not know which study treatment they are getting.
How to say: Single-blind study
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A participant in a single-blind study does not know which study group they are in, but the study doctor does.
Some studies are done this way because if participants know which treatment they are getting this can affect the results of the study, through a concept called bias.
Bias can occur when participants know which study group they are in.
Participants can ask to find out which study treatment they received after the study ends.