I have a few proposals with respect to the consistency of OMOP. I would like to start with quantity and strength:
Currently, we do not have any convention how the quantity attribute in the DRUG_EXPOSURE table is linked to the DRUG_STRENGTH table.
This prevents us from calculating dosages and applying OMOP to European data sources.
Imagine if the quantity refers to mg but the corresponding entry in the DRUG_STRENGTH refers to something else like ml or percentages.
I suggest the following two conventions:
- Entries in the DRUG_STRENGTH table which belong to the same
drug_concept_id must use the same denominator_unit_concept_id or use
- The quantity in the DRUG_EXPOSURE table must refer to
the denominator_unit_concept_id in the DRUG_STRENGTH table in case of concentrations or to “pieces” in case of amounts.