Person-time (years) at risk for 10 participants in a 5-year cohort study (3 points) Years of follow-up Subject 1 2 3 4 5

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Person-time (years) at risk for 10 participants in a 5-year
cohort study (3 points)
Years of follow-up
Subject 1 2 3 4 5 Years at risk
1 -------------- -------------- -------------- --------------
-------------- 5
2 -------------- -------------- -------------L 3
3 -------------- ------------X 2
4 -------------- -------------- -------------- ------------X
4
5 -------------- -------------- -------------- -------------
-------------- 5
6 -------------- -------------- ------------X 3
7 -------------- -------------- -------------- --------------
-------------- 5
8 -------------- -------------- -------X 2.5
9 -------------- -------------- -------------- --------------
-------------- 5
10 -------------- -------------- -------------- -------------X
4
-------- time at risk
L lost to follow-up
X disease

c) Given that the incidence rate is the number of new cases of
disease in a given time
period divided by the total person-time at risk during the study
period, what would the
incidence rate of disease be for the above study? (Round part ii to
the nearest decimal
point)
i. Per person-year:
ii. Per 100 person-years: