PROPERTY 2: Is smoking a risk factor for MI in the absence of the exposure, diabetes. So we look in the non- diabetics (

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Property 2 Is Smoking A Risk Factor For Mi In The Absence Of The Exposure Diabetes So We Look In The Non Diabetics 1 (49.56 KiB) Viewed 53 times

PROPERTY 2: Is smoking a risk factor for MI in the absence of the exposure, diabetes. So we look in the non- diabetics (unexposed) and calculate an odds ratio. NON-DIABETICS (E-) Case (MI+, D+) Control (MI-, D- Smokers (C+) 500 155 1655 Non-smokers (C-) 990 1426 2416 Total 1490 1581 3071 e) Calculate the odds ratio? f) Is smoking a risk factor for disease in the absence of exposure? PROPERTY 3: We will assume that smoking is not on the causal pathway: it is unlikely that people start to smoke because they have been diagnosed with diabetes. g) Having checked the three properties, do you think we should adjust for smoking? h) What happens when we ignore confounding?