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Atlas - What should be Cohort Exit criteria?


(Shrikant Kunte) #1

Hello Everyone,
I was creating a cohorts of Type 2 diabetes mellitus in Atlas (http://atlas-demo.ohdsi.org/#/cohortdefinition/1773279), I wonder what will be Cohort Exit criteria in my cohort. I saw three options for cohort exit criteria

1) End of continuous observation
This one is by default, but when I use this, Atlas gives error message - “all events” are selected and cohort exit criteria has not been specified.

2) Fixed duration relative to an event
I followed Book of OHDSI and some topics on forum, according to which Fixed duration relative to an event is the time period from start date or end date of an event and after which patient will leave the cohort.
But in case of Type 2 diabetes mellitus, there is no such fixed offset time.

3) End of continuous drug exposure
My cohort include patients not only based on drug but also diagnosis and pathology tests. So what will be exit criteria for those patients which are included using lab test results.


(Kristin Kostka, MPH) #2

Hi @Shrikant_Kunte1! There was just a discussion on this very topic here: Atlas - When & Why to use Cohort Exit criteria?


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