Person-time” is used as a unit of measure in the denominator of incidence calcul

Question

Person-time” is used as a unit of measure in the denominator of incidence calculations when some of the research subjects for whom incidence is being calculated are lost to follow-up over the course of the study period. In this context, when summing up person-time for the purpose of calculating incidence, research subjects can contribute to the count under the following circumstances:

Question 8 options:

until they become a case

for however long we have data on the subject, including the post-diagnostic period.

only if they are followed for the entirety of the study period

until they are lost to follow-up

A and D

A)

until they become a case

B)

for however long we have data on the subject, including the post-diagnostic period.

C)

only if they are followed for the entirety of the study period

D)

until they are lost to follow-up

E)

A and D

Explanation / Answer

Research subjects can contribute until they become a case or until they are lost follow - up.

Option E is correct.

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