cohort_definition

Overview

The COHORT_DEFINITION table contains records defining a Cohort derived from the data through the associated description and syntax and upon instantiation (execution of the algorithm) placed into the COHORT table. Cohorts are a set of subjects that satisfy a given combination of inclusion criteria for a duration of time. The COHORT_DEFINITION table provides a standardized structure for maintaining the rules governing the inclusion of a subject into a cohort, and can store operational programming code to instantiate the cohort within the OMOP Common Data Model.

ETL Conventions

NA

Table Columns

Field	Type	Required
cohort_definition_id	integer	Yes
cohort_definition_name	varchar(255)	Yes
cohort_definition_description	varchar(MAX)	No
definition_type_concept_id	integer	Yes
cohort_definition_syntax	varchar(MAX)	No
subject_concept_id	integer	Yes
cohort_initiation_date	date	No

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cohort_definition_id

This is the identifier given to the cohort, usually by the ATLAS application.

cohort_definition_name

A short description of the cohort.

cohort_definition_description

A complete description of the cohort.

definition_type_concept_id

Type defining what kind of Cohort Definition the record represents and how the syntax may be executed.

cohort_definition_syntax

Syntax or code to operationalize the Cohort Definition.

subject_concept_id

This field contains a Concept that represents the domain of the subjects that are members of the cohort (e.g., Person, Provider, Visit).

cohort_initiation_date

A date to indicate when the Cohort was initiated in the COHORT table.