What is the justification for 1:4 ratio in Case Control study? What are statistical reasons for considering 1: 4 ratio in a case control study?

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Is it commendable or possible to computing and describing the prevalence rate of an outcome interest (mainly the cases) in case control study?

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It is recommendable that computing the prevalence rate of an outcome interest in case control study?

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What is the justification for 1:4 ratio in Case Control study? What are statistical reasons for considering 1: 4 ratio in a case control study?

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Surendra Karki

There is not much increment in study power once the case to control ratio is >1:4. Very less increment in power but high increase in resources to collect data from larger number of control makes us decide toward enough powered by not unnecessairly high number of controls. This book gives good description around it- https://books.google.com.au/books?id=VJDSBQAAQBAJ&dq=Woodward+Mark+Epidemiology+text

Khaled Almaz

What is the Rationale for 1:2 ratio in Case Control studies?

** There are 2 answers only recommended.

https://www.researchgate.net/post/What_is_the_Rationale_for_12_ratio_in_Case_Control_studies

Desta Debalkie

Thank you so much Surendra Karki for your quick response & very valuable information.