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Case-control studies #2 - Coggle Diagram
Case-control studies #2
Nested
target population
cases = cohort members who develop the study disease
control = cohort members disease-free at point of case diagnosis
advantages
reduced costs
less effort
reduced selection bias - case and control from same population
flexible
disadvantages
smaller sample size
less power in outcome
a case-control study nested within an existing cohort study
Case-crossover
target population
no control group
cases = own control
exposure = period prior to disease onset compared to normal exposure frequency
case window = person is a case
control window = person is not a case
used to identify the risks of transient/time-varying exposures on the risk of acute-onset diseases
compares risk of exposure during case window to risk of exposure during control window
can use multiple control windows to just one case = flexible