Urology>>>>>Statistics, Research and Governance
Question 6#

In the same study as described in question 5, what are the odds of developing AUR in the placebo arm?

A. 0.30
B. 0.31
C. 0.32
D. 0.33
E. 0.34

Correct Answer is D

Comment:

Answer D

It is important to be able to distinguish between risk (probability) and odds as they are both often used in published studies, but are not interchangeable. The risk, or probability, is defined as the number of subjects experiencing the outcome of interest divided by the total population at risk/being studied. It can either be expressed as a value between 0 (never occurred) to 1 (always occurred) or as a percentage. This contrasts to odds which equals the probability of an event occurring divided by the probability that it does not. Odds and odds ratio (odds in ‘exposed’ group divided by odds in ‘unexposed’ group) are often used in studies reporting on binary outcome variables (e.g., mortality).