From 4a166f5c2b8db0ffe742cb9472f2b341534490eb Mon Sep 17 00:00:00 2001 From: Gowtham Rao Date: Thu, 17 Aug 2017 16:33:25 -0400 Subject: [PATCH] Updated descriptions and conventions Updated based on https://github.com/OHDSI/WebAPI/pull/234#issuecomment-323076164 --- .../StandardizedDerivedElements/COHORT.md | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/Documentation/CommonDataModel_Wiki_Files/StandardizedDerivedElements/COHORT.md b/Documentation/CommonDataModel_Wiki_Files/StandardizedDerivedElements/COHORT.md index 5dd30d2..39536a7 100644 --- a/Documentation/CommonDataModel_Wiki_Files/StandardizedDerivedElements/COHORT.md +++ b/Documentation/CommonDataModel_Wiki_Files/StandardizedDerivedElements/COHORT.md @@ -1,4 +1,4 @@ -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 :--------------------|:--------|:------------|:---------------------------- @@ -11,4 +11,6 @@ Field|Required|Type|Description * 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