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Updated descriptions and conventions 

Updated based on https://github.com/OHDSI/WebAPI/pull/234#issuecomment-323076164
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Gowtham Rao 2017-08-17 16:33:25 -04:00 committed by GitHub
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Documentation/CommonDataModel_Wiki_Files/StandardizedDerivedElements/COHORT.md
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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.
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.
Field|Required|Type|Description
:--------------------|:--------|:------------|:----------------------------
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* 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.
* Cohort records must contain a Subject Id, which can refer to the Person, Provider, Visit record or Care Site. The Cohort Definition will define the type of subject through the subject concept id.
* A subject can belong (or not belong) to a cohort at any moment in time
* A subject can only have one record in the cohort table for any moment of time, i.e. it is not possible for a person to contain multiple records indicating cohort membership that are overlapping in time