OMOP/Documentation/CommonDataModel_Wiki_Files/StandardizedDerivedElements/Standardized-Derived-Elemen...

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[DRUG_ERA](https://github.com/OHDSI/CommonDataModel/wiki/DRUG_ERA)
[DOSE_ERA](https://github.com/OHDSI/CommonDataModel/wiki/DOSE_ERA)
[CONDITION_ERA](https://github.com/OHDSI/CommonDataModel/wiki/CONDITION_ERA)
These tables contain information about the clinical events of a patient that are not obtained directly from the raw source data, but from other tables of the CDM.
Below provides an entity-relationship diagram highlighting the tables within the Standardized Derived Elements portion of the OMOP Common Data Model:
![](http://www.ohdsi.org/web/wiki/lib/exe/fetch.php?media=documentation:cdm:standardized_derived_elements_3.png)\