I am working on a project trying to answer the question of COVID mortality rate of the hospitalized among the racial groups. I selected race/ethnicity through the already built-in defaulted demographics race/ethnicity on the ‘feature analysis’ section of the cohort characterization in Atlas. As I tried to run this cohort characterization through Atlas, I noticed on the output that the total percentage of the racial groups does not equal 100%. So, this tells me that the built-in defaulted demographics race/ethnicity selected on the feature analysis did not include all possible values (eg. Null, unknown, others…etc). So I was wondering if there was a way I can edit or create a race/ethnicity for the feature analysis selection?
Feature Analysis/Cohort Characterization Tool in ATLAS
krfeeney
(Kristin Kostka, MPH)
#2
Hi Diana!
Sorry to be so slow! Holiday week. You did the right thing bugging me on the forum to ask this. 
Couple of things:
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I consulted some ATLAS developers. Some of this is a quirk of WebAPI. WebAPI is designed to filter out stats that are < 1% prevalence – this is for performance purposes (lots of empty cells). This is problematic for demographics because it hides some information.
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Also, OMOP standard concepts do not use the flavors of null. We see things at “0 - No Matching Concept” or it’s a valid standard concept…
- Ethnicity comes in two flavors: Hispanic or Not Hispanic (https://athena.ohdsi.org/search-terms/terms?domain=Ethnicity&page=1&pageSize=15&query=)
- Race is a little more enumerated: https://athena.ohdsi.org/search-terms/terms?domain=Race&standardConcept=Standard&page=1&pageSize=50&query=&sort=concept_code&order=asc
I’ll tag in @anthonysena, our guru on Characterization, if he has any advice on how to get to the numbers you’re looking for.
Do you have database level access?
Best,
Kristin
schillil
(Lisa Schilling)
#3
@dir0417 @krfeeney @anthonysena
Kirstin- thanks for the great info!
We’re looking for a guide or instructions on to create new features. There is another post about how to so by Chris Knoll, but I think it’s a bit outdated and it led to an issue being created in github (How to create own features - Atlas Characterization - Summary Statistics). We searched the Book of OHDSI but didn’t find anything. Has anyone made an internal cheat-sheet or any guide? Thanks! Lisa