A cohort study differs from a case-control study in that:
1
Subjects are enrolled or categorized on the basis of their exposure status in a cohort study but not in a case-control study
2
Subjects are asked about their exposure status in a cohort study but not in a case-control study
3
Cohort studies require many years to conduct, but case-control studies do not
4
Cohort studies are conducted to investigate chronic diseases, case-control studies are used for infectious diseases