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This methodological technique aims to reduce bias in results by preventing researchers from knowing which study condition a participant has been allocated. There are different levels to blinding that determine who is blinded from a study:

  • Single-blind study: The participant does not know which group they have been randomised to
  • Double-blind study: The participant, clinicians and researchers do not know what condition they are randomised to
  • Triple-blind study: The participant, clinicians, researchers, and those conducting the analysis of the  data do not know the study conditions