In a trial, stroke occurred in 8% of control patients and 4% of treated patients over 5 years. Adverse events were similar. A resident asks how many

Question

In a trial, stroke occurred in 8% of control patients and 4% of treated patients over 5 years. Adverse events were similar. A resident asks how many patients need treatment to prevent one stroke. Which of the following is the most likely explanation for this patient's findings?

Accepted Answer

25

Answer

12

Answer

8

Answer

50

Answer

4

Number needed to treat — USMLE Step 3 MCQ

In a trial, stroke occurred in 8% of control patients and 4% of treated patients over 5 years. Adverse events were similar. A resident asks how many patients need treatment to prevent one stroke. Which of the following is the most likely explanation for this patient's findings?