Step I Controls in Cohort Vs. Case-Control

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stronghold

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I want to make sure if I understand the concept correctly. In COHORT, controls should not be exposed. While in CASE-CONTROL, controls should not be selected based on exposure status, hence heterogeneous group (exposed and non-exposed)?
 
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Yes, in a cohort study you classify based on exposure and follow/evaluate for disease. In a case control you classify based on disease and then evaluate for exposure.
 
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