The incidence of disease X is 56/1,000 per year among smokers and 33/1,000 per year among nonsmokers.What proportion of cases of disease X are due to smoking among those who smoke?

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Quizplus · Accepted Answer

In other words,this question asks for the attributable risk.The attributable risk is calculated as follows: (incidence in exposed - incidence in unexposed)/(incidence in exposed); in this example: (56/1,000 - 33/1,000)/(56/1,000) = 0.41,or 41%.

The Incidence of Disease X Is 56/1,000 Per Year Among