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clairblacketer 2017-06-20 11:16:01 -04:00
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StandardizedDerivedElements/COHORT.md

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*OMOP Common Data Model v5.1 Specifications*
<br>*Authors: Christian Reich, Patrick Ryan, Rimma Belenkaya, Karthik Natarajan, Clair Blacketer*
<br>***Release date needed***
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.
[Back to Table of Contents](https://github.com/OHDSI/CommonDataModel/blob/master/Documentation/TableofContents.md)
Field|Required|Type|Description
:----|:----|:-----|:-----
|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.|
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# 8.1 COHORT
### Conventions
* The core of a Cohort is the unifying definition or feature of the Cohort. This is captured in the cohort_definition_id. For example, Cohorts can include patients diagnosed with a specific condition, patients exposed to a particular drug, or Providers who have performed a specific Procedure.
* Cohort records must have a Start Date
* Cohort records must have an End Date, but may be set to Start Date or could have applied a censored date using the Observation Period Start Date.
* Cohort records must contain a Subject Id, which can refer to the Person, Provider, or Visit record. The Cohort Definition will define the type of subject through the subject concept id.