Data model harmonization for the All Of Us Research Program: Transforming i2b2 data into the OMOP common data model
Fig 1
Ontology-driven data transformation in i2b2.
The ontology, which defines concept metadata, drives the transformation from i2b2 to OMOP. Data are retrieved from the i2b2 fact table, converted to OMOP codes via ontology lookups, and then written to the OMOP tables specified through the ontology concept path.