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Purpose: Provide a field to store the age of a participant at a given event
Who it benefits: Research platforms that store deidentified longitudinal data using ages versus dates
Use case: FHIR is date oriented for clinical care, we mainly utilize "age at" with date of birth being the index point for safe harbor purposes (versus date shifting or other techniques). Currently we have an extension created used across multiple resources to represent this, but there may be better approaches? Also it's recently come up that with some dataset we may have periods of time (e.g. when a condition started/ended). It looks like there's something similar in OMOP where it's noted the end date might often not be known, which would be more generalized.
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cc @ncpi-fhir/kfdrc-fhir-data-team