Empirical Evidence of Observer Bias in Randomized Clinical Trials: Updated and Expanded Analysis of Trials With Both Blinded and Non-Blinded Outcome Assessors
April 2025
in “
Journal of Clinical Epidemiology
”
Studysummary This study found that non-blinded assessors in randomized clinical trials exaggerated the effects of experimental interventions by about 29% compared to blinded assessors, indicating a significant potential for observer bias in treatment evaluations.
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