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6,750 people who were free of disease X were enrolled in a cohort study in 1985...

6,750 people who were free of disease X were enrolled in a cohort study in 1985 and followed with annual exams and interviews through 1995. Exposure to factor A was determined at study enrollment and the participants were followed until 1995 to observe new cases of disease X. Data from the study at the end of follow-up are shown in the following table. What is the incidence rate of disease X among persons exposed to factor A? Exposure to Factor A People with Disease X People without Disease X Not Exposed 30 3,720 Exposed 120 2,880

Select one:

a. 0.04

b. 0.19

c. 0.25

d. 4.00

e. 5.17

math   Statistics-And-Probability   
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Answer #1

Here option A is correct answer

I.e. " 0.04 "

Because the incident rate for disease X among exposed person is found by dividing 120 by the total number of exposed persons .if multiplied by 100 then the incidence rate would equal 4 per 100 persons however, this metric is not explicitly requested.

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