what is a case cohort study?

16 Mar

This study design is used when a large cohort is needed to observe enough cases but it is not feasible to collect datas for the whole cohort because it is not viable due to the costconsideration.

Datas are collected 1) only for all the cases observed in the original cohort and in the other hand 2) only for a random subsample of the original cohort(subcohort).  The union of 1) and 2) is referred to as the case-cohort set.

Thess are two exemples of case-cohort study:







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