Which statement best captures the RR interpretation caveat regarding outcome type?

• A. The RR interpretation is fixed regardless of outcome.
• B. The RR interpretation depends on sample size.
• C. The RR interpretation depends on baseline risk.
• D. The RR interpretation depends on whether the outcome is positive or negative.

Answer: (D)

Interpreting a risk ratio hinges on what the outcome represents. If the outcome is something we want to avoid, like developing a disease, a risk ratio greater than one means the exposed group has a higher risk of that harm, while a ratio less than one means a lower risk. If the outcome is something desirable, like recovery, a risk ratio greater than one means the exposed group has a higher chance of achieving that positive outcome. Because the practical meaning of “higher” or “lower” depends on whether the outcome is good or bad, the interpretation of the risk ratio changes with the outcome type. This is the caveat. Other factors like sample size or baseline risk affect precision or the absolute magnitude of effect, but the basic directional interpretation of the ratio still hinges on whether the outcome is positive or negative.