Introduction to Epidemiology 6th Edition by Ray M Merrill

Exercise 22

A prospective cohort study showed that 200 new cases of disease X occurred in 2,000 person-years. Calculate the person-time incidence rate and 95% confidence interval.

Step 1 of 4

Incidence rate is defined as the number of cases that are new which is related to a state or event of a health which is described in a given interval of time divided to people who are at risk to become a case. This can be formulated as follows:

Where, values of n may be 0, 1, 2, 3, 4, and so on.