Question: Suppose that a case-control study was conducted in the United States to find out whether a Black womans exposure to racism during pregnancy influenced her

Suppose that a case-control study was conducted in the United States to find out whether a Black womans exposure to racism during pregnancy influenced her risk of giving birth prematurely. Investigators selected 500 cases who were hospitalized for premature delivery and 1,000 controls. The study found that 90 case mothers and 50 control mothers reported overt incidents of racism during their pregnancy.

Answer this Qestion based on the case study above:

Why do investigators use the odds ratio in a case-control study (instead of the risk or rate ratio) to measure the strength of the association between an exposure and a disease?

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