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In measurement type, Derived value meaning


(Micheal ) #1

Hello OHDSI,
I’m trying to understand domain of measurement.
What’s the derived value mean?
Is it literally where the contents were derived from?


(Micheal ) #3

Sorry @Dymshyts
I don’t understand what you mean.
I couldn’t find the ‘Derived value’ means in wiki.
Can you clarify explanation more please?


(Dmytry Dymshyts) #4

Sorry, I just wrote that I don’t see “derived value” in a list of columns in MEASUREMENT table, then saw the “Measurement type” and deleted message.
I haven’t used this term in practice. Let me guess:
It is the value you don’t have in the patient record, but you calculate it when ETL.
For example, you have patient weight and height, so, you can calculate BMI which will be derived value.
As I’m not sure, let’s hear from the other community members.


(Micheal ) #5

By using weight & height for calculating BMI, Um…that a bit makes sense tho
I want to know exactly and more deeply.
Let me guess too. I think that it’s just derived from EHR as patient recorded value


(Christian Reich) #6

@Dymshyts: That’s it. BMI, eGFR, those kind of things.


(Seng Chan You) #7

Yes, I want to add eGFR as one of the derived value

I’m writing the book of OHDSI Korea, and I’ll add your questions and answers for other new beginners (https://github.com/ohdsi-korea/TheBookOfOhdsiKorea/issues/4).


(Micheal ) #8

Thank you for your concern :slight_smile:


(Micheal ) #9

Instance of BMI, your example was really helpful to understand!
Thank you @Dymshyts


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