The Main Difference Between a Cohort Study and a Randomized

question 5

Multiple Choice

The main difference between a cohort study and a randomized trial is that

• A) cohort studies are longitudinal and randomized trials are cross-sectional.
• B) only clinical trials can evaluate the effect of a drug.
• C) randomized trials are experimental and cohort studies are observational.
• D) clinical trials are observational and cohort studies are experimental.
• E) at the beginning of a clinical trial, participants are free of disease, and cohort studies start with patients with a disease.

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