Aaron is studying smoking behavior and has coded "smoker" as "1" and "non-smoker" as "0." The predictor is the number of family members who smoke. Which of the following is a correct interpretation of an odds ratio of +2?
A) For every additional family member who smokes, the odds of being a smoker increase by 100%.
B) For every additional family member who smokes, the odds of being a smoker decrease by 100%.
C) For every one-unit increase in being a smoker, the odds of having a family member who smoke increase by 100%.
D) For every one-unit increase in being a smoker, the odds of having a family member who smoke decrease by 100%.

Question

Quizplus · Accepted Answer

An odds ratio of +2 means that for every additional family member who smokes, the odds of being a smoker double, or increase by 100%. This is because an odds ratio represents the factor by which the odds increase (in this case, by 2) for each unit increase in the predictor variable.

Aaron Is Studying Smoking Behavior and Has Coded "Smoker" as "1