Case-control studies are much more efficient than cohort studies in that they focus on a smaller number of people and can be completed relatively quickly.

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Case-control studies are indeed more efficient than cohort studies because they focus on individuals who have a specific outcome (cases) and a comparable group without the outcome (controls), which allows for quicker and less expensive studies compared to cohort studies that follow large groups over time to observe outcomes.

Case-Control Studies Are Much More Efficient Than Cohort Studies in That