Epidemiology & Prevention USMLE Step 1 Practice Question
A 58-year-old man with a 40 pack-year smoking history presents with a 3-month history of productive cough and occasional hemoptysis. Vital signs are stable and oxygen saturation is 98% on room air. Chest CT reveals a 3-cm left upper lobe nodule suspicious for malignancy. A prospective cohort study follows 10,000 smokers and 10,000 non-smokers for 10 years. Over this period, lung cancer develops in 400 smokers and 20 non-smokers. Which of the following best represents the relative risk of lung cancer in smokers compared to non-smokers?
Answer choices
- A5.0
- B10.0
- C20.0Correct answer
- D40.0
- E200.0
- F400.0
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