In a cohort study examining the association of lung cancer with the use of e-cig
ID: 3387674 • Letter: I
Question
In a cohort study examining the association of lung cancer with the use of e-cigarettes, it is essential that:
The population to be followed is representative of the general population
All cases identified as having lung cancer at baseline should be removed from the cohort
The study is done in a double blind fashion
There are equal numbers of persons in the exposed and not exposed groups
Follow-up is greater than 75% in both the exposed and not exposed groups
A.The population to be followed is representative of the general population
B.All cases identified as having lung cancer at baseline should be removed from the cohort
C.The study is done in a double blind fashion
D.There are equal numbers of persons in the exposed and not exposed groups
E.Follow-up is greater than 75% in both the exposed and not exposed groups
Explanation / Answer
All cases identified as having lung cancer at baseline should be removed from the cohort