EBM

Question 1

What is an Odds Ratio?

Answer 1

Measure of association between an exposure and an outcome

The odds that an outcome will occur given a particular exposure, compared to the odds of the outcome occurring in the absence of that exposure

OR = 1 means no association

Question 2

How is an Odds Ratio calculated?

Answer 2

OR = odds of disease in exposed / odds of disease in the non-exposed

= (a/b) / (c/d)