NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What does a Hazard Ratio (HR) of less than 1 indicate?

Poorer survival in treatment group
Better survival in control group
Event rate in treatment group is lower
Event rate in control group is higher

The correct answer is: Event rate in treatment group is lower

A Hazard Ratio (HR) of less than 1 indicates that the event rate in the treatment group is lower compared to the control group. This means that the treatment group has a lower risk of experiencing the event being studied. Options A and B are incorrect because they involve comparing survival rates, which is not the same as comparing event rates. Option D is also incorrect because it suggests that the control group has a higher event rate, which is opposite to what a HR value of less than 1 indicates.