@ericaVoss Patient Generated Health Data (PGHD) not only includes step counts (activity), calories intake (nutrition), but also include patient reported condition, measurement or drug.
Since first target population is diabetic patients, we'll start with glucose level and insulin dosages. I think these data can be captured in measurement and drug_exposure table only when the time and the dosage or the result are specified.
Otherwise, I agree with @Ajit_Londhe 's opinion, which somewhat ambiguous data would be stored in observation table.
I'm developing ETL document for accessible PGHD now. I'll release it soon. Then, we can discuss further!
Sorry, since we don't have these data in our data network, I don't know... I hope these data also to be integrated within OMOP-CDM.