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USMLE Step 3 Practice Questions - United States Medical Licensing Examination Step 3 Exam

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A pharmaceutical company is testing a new drug for migraine prevention. The primary outcome is reduction in migraine frequency. The study enrolls 400 patients: 200 receive the new drug and 200 receive placebo. After 6 months, 120 patients in the treatment group and 80 in the placebo group show ≥50% reduction in migraine frequency. What is the number needed to treat (NNT)?
Correct Answer:
5

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