Table 1 Subcohort selections for the example cohort: first selection: follow-up to the end of the year 2003, second selection: follow-up to the end of the year 2004. These case definitions used for CHD and stroke are specific for determining the subcohort size; the definitions used for defining the case-cohort set are usually wider.

From: Case-cohort design in practice – experiences from the MORGAM Project