Epidemiology & Prevention USMLE Step 1 Practice Question
A case-control study investigates risk factors for type 2 diabetes mellitus in a primary care population. Researchers identify 500 patients with newly diagnosed type 2 diabetes (fasting glucose ≥126 mg/dL) and 500 age-matched controls without diabetes from the same clinic. Participants are questioned about their weight history and lifestyle factors. Among diabetic patients, 320 had a BMI >30 kg/m² at baseline; among controls, 100 had a BMI >30 kg/m². Physical activity levels were similar between groups. Which of the following best estimates the odds ratio of obesity as a risk factor for type 2 diabetes?
Answer choices
- A1.6
- B2.1
- C3.2Correct answer
- D4.8
- E6.4
- F12.8
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