The OBSERVATION_PERIOD table contains records which uniquely define the spans of time for which a Person is at-risk to have clinical events recorded within the source systems, even if no events in fact are recorded (healthy patient with no healthcare interactions).
|observation_period_id||Yes||integer||A unique identifier for each observation period.|
|person_id||Yes||integer||A foreign key identifier to the person for whom the observation period is defined. The demographic details of that person are stored in the person table.|
|observation_period_start_date||Yes||date||The start date of the observation period for which data are available from the data source.|
|observation_period_end_date||Yes||date||The end date of the observation period for which data are available from the data source.|
|period_type_concept_id||Yes||Integer||A foreign key identifier to the predefined concept in the Standardized Vocabularies reflecting the source of the observation period information|