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post: In epidemiology, randomized trials are commonly used to evaluate the effectiveness of preventive strategies, treatments, and public health interventions. Examples include vaccine trials, medication studies, and trials assessing behavioral or lifestyle interventions. By prospectively following participants and systematically measuring outcomes, randomized trials can estimate measures such as risk reduction, relative risk, and efficacy with high internal validity. Blinding of participants, investigators, or outcome assessors further strengthens the reliability of findings by reducing measurement and performance bias.