Adjusting for Confounding
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You have just finished the data collection for a case-control study of smoking and diabetes risk. You set out to analyze your results, but you are aware that alcohol intake is a potential confounder of the association between smoking and diabetes – alcohol intake is a risk factor for diabetes, and is also associated with smoking. The following table shows the crude results from your study:
Diabetes No Diabetes
Smoker 30 18
Nonsmoker 70 82
Based on this data, does there appear to be an association between smoking and diabetes? Calculate and interpret the appropriate measure of association. Show your calculations.
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