In an adequately powered, randomized controlled trial conducted over 2 years, the desired clinical outcome (i.e. prevention of a serious cardiovascular event) with a new drug is achieved in 25% of the study sample. In the patients who receive a placebo, only 15% obtain the same clinical benefit.

In an adequately powered, randomized controlled trial conducted over 2 years, the desired clinical outcome (i.e. prevention of a serious cardiovascular event) with a new drug is achieved in 25% of the study sample. In the patients who receive a placebo, only 15% obtain the same clinical benefit.

The relative risk reduction achieved with the new drug over the study period is:
A . 10%.
B . 15%.
C . 25%.
D . 40%.
E . 50%.

View Answer

Answer: D