Double-blind (adjective)

Describing a scientific study or experiment in which neither the participants nor the researchers know who is receiving the treatment or placebo.

Origin:

Early 20th century: from double + blind in the sense 'having the eyes covered or shut'.

Examples:

1. The study was conducted as a double-blind experiment to eliminate bias.
2. The double-blind procedure ensured that the results were not influenced by the expectations of the participants or researchers.
3. The double-blind design of the trial minimized the risk of placebo effects.
4. The double-blind method provided a more accurate assessment of the treatment's effectiveness.
5. The double-blind approach helped to control for variables that could affect the outcome of the study.