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

  1. 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 the following questions about case-control studies in general:

  1. State the main advantages and disadvantages of case-control studies.

  1. 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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