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Review Question - QID 214713

QID 214713 (Type "214713" in App Search)
A researcher is investigating a potential association between adolescent dairy consumption and breast cancer. She interviews 100 patients with breast cancer and 200 patients without breast cancer to assess how many average servings of dairy they had per week in adolescence. She groups the dairy consumption levels as high versus low. She then calculates the odds ratio of high dairy consumption of patients with breast cancer compared to patients without breast cancer. What kind of study design did this researcher use?