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بسم الله الرحمن الرحيم
EPIDEMYOLOGY
مطالعه مورد – شاهد ي
Case – Control Study
Case – Control Study
Retrospective designs
(Looking backward)
Ex post facto
After the fact
Case – Control Study
Case control studies are which patients who already have XXXX (Case) are compared with people who do not (Control).
Case control studies are less reliable than randomized controlled trials or cohort studies.
Case - Control Study
?
Exposure
?
Exposure
Disease
control
Take History
Take History