Hey @mattspotnitz, saw this discussion and your other post here: Absolute Age Group Counts vs. Percentages in Feature Extraction regarding characterization. Were you able to solve this? I don’t use Feature Extraction, but I created some OMOP tools to perform characterizations outside of tools like Feature Extraction. A tutorial for one such tool is here: Using OMOPCDMCohortCreator with R 🏴☠️ · OMOPCDMCohortCreator.jl I’d be happy to assist with running this with you and assisting in any way as to my knowledge, there isn’t a separate HADES package for running characterizations. Feel free to email me at jacob.zelko@gtri.gatech.edu or DM me either here or on Teams. 