Double blind trial concept describes who is unaware?

Double blind trial concept describes who is unaware?

• A. Only participants
• B. Both participants and researchers
• C. Only researchers
• D. Neither

Answer: (C)

Double blind means that neither the participants nor the people evaluating the outcomes know who is receiving the active treatment and who is receiving a placebo. This setup helps prevent bias from both sides: participants won’t let their expectations influence how they report symptoms, and researchers won’t let their expectations influence how they measure or interpret results. If only one group is unaware (for example, only the researchers), that wouldn’t be double blind; it’s a different design that’s more prone to bias. In some studies, a step further is taken where the data analysts also don’t know which groups are which, called triple blind. The essential point is that both participants and those conducting the trial are kept unbiased to ensure the findings reflect the treatment effect rather than expectations or observer bias.

Double blind means that neither the participants nor the people evaluating the outcomes know who is receiving the active treatment and who is receiving a placebo. This setup helps prevent bias from both sides: participants won’t let their expectations influence how they report symptoms, and researchers won’t let their expectations influence how they measure or interpret results. If only one group is unaware (for example, only the researchers), that wouldn’t be double blind; it’s a different design that’s more prone to bias. In some studies, a step further is taken where the data analysts also don’t know which groups are which, called triple blind. The essential point is that both participants and those conducting the trial are kept unbiased to ensure the findings reflect the treatment effect rather than expectations or observer bias.