dear all:
when I use the atlas to do prediction research, I am a little confused about the covariates in the domain. For example, if I choose the observation domain, then the included covariates are only the observation_concept_id , the different observations my cohort’s members had prior to the cohort start date, or they include all concept ids, such as observation_ type_concept_id and value_as_concept_id,qualifier_concept_id,unit_concept_id and so on, which are also observed prior to the cohort start date
thank you very much