| attribute | type | cardinality | unique | required | doc |
|---|---|---|---|---|---|
| day | long | one | The days since the reference event | ||
| id | string | one | The id of the study day | ||
| reference-event | study-day.reference-event | one | The reference event (e.g. study enrollment) that study days are counted from. Refers to entities in the study.day.reference.event namespace | ||
| uid | [[* string]] | one | yes | Synthetic unique ID for study days |