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

A cohort study finds a relative risk of 1.0. What does this indicate?

  1. Exposure increases the risk of disease
  2. Exposure decreases the risk of disease
  3. No link between exposure and disease
  4. The study must be invalid
Show answer and explanation

Correct answer: No link between exposure and disease

A relative risk of 1 means the exposed and unexposed groups have equal risk.

Difficulty: Medium Question 8 of 20

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