Define relative risk and odds ratio and when each is typically used.

Define relative risk and odds ratio and when each is typically used.

• A. Relative risk compares risk between two groups in a cohort; odds ratio compares odds of exposure among cases vs controls; RR is used in cohort studies, OR in case-control studies.
• B. Relative risk and odds ratio are identical measures used interchangeably in all study designs.
• C. Relative risk is used in case-control studies; odds ratio is used in cohort studies.
• D. Odds ratio measures the probability of disease given exposure.

Answer: (A)