The COHORT table contains records of subjects that satisfy a given set of criteria for a duration of time. The definition of the cohort is contained within the COHORT_DEFINITION table. Cohorts can be constructed of patients (Persons), Providers or Visits.
|cohort_definition_id||Yes||integer||A foreign key to a record in the COHORT_DEFINITION table containing relevant Cohort Definition information.|
|subject_id||Yes||integer||A foreign key to the subject in the cohort. These could be referring to records in the PERSON, PROVIDER, VISIT_OCCURRENCE table.|
|cohort_start_date||Yes||date||The date when the Cohort Definition criteria for the Person, Provider or Visit first match.|
|cohort_end_date||Yes||date||The date when the Cohort Definition criteria for the Person, Provider or Visit no longer match or the Cohort membership was terminated.|