Retrospective cohort study design
THE PAST
THE PRESENT
Risk factor
present
Risk factor
absent
Population
Sample
Disease
No
disease
Disease
No
disease
Steps:
1. Identify a cohort that has been assembled in the past
2. Collect data on predictor variables (measured in the past)
3. Follow-up the cohort
4. Collect data on outcome variables (measured in past or present)
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