Biostatistics: Mean, Median, Risk Ratios · USMLE Step 1

A case-control study reports an odds ratio of 4. This means:

  1. The odds of disease are four times higher
  2. The exposure reduces disease risk by 75%
  3. The disease is relatively rare
  4. The odds are equal between the two groups
Show answer and explanation

Correct answer: The odds of disease are four times higher

An odds ratio of 4 means the exposed group has four times the odds of disease.

Difficulty: Medium Question 9 of 20

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