A Drug Era is defined as a span of time when the Person is assumed to be exposed to a particular active ingredient. A Drug Era is not the same as a Drug Exposure: Exposures are individual records corresponding to the source when Drug was delivered to the Person, while successive periods of Drug Exposures are combined under certain rules to produce continuous Drug Eras.
|drug_era_id||Yes||integer||A unique identifier for each Drug Era.|
|person_id||Yes||integer||A foreign key identifier to the Person who is subjected to the Drug during the fDrug Era. The demographic details of that Person are stored in the PERSON table.|
|drug_concept_id||Yes||integer||A foreign key that refers to a Standard Concept identifier in the Standardized Vocabularies for the Ingredient Concept.|
|drug_era_start_date||Yes||date||The start date for the Drug Era constructed from the individual instances of Drug Exposures. It is the start date of the very first chronologically recorded instance of conutilization of a Drug.|
|drug_era_end_date||Yes||date||The end date for the drug era constructed from the individual instance of drug exposures. It is the end date of the final continuously recorded instance of utilization of a drug.|
|drug_exposure_count||No||integer||The number of individual Drug Exposure occurrences used to construct the Drug Era.|
|gap_days||No||integer||The number of days that are not covered by DRUG_EXPOSURE records that were used to make up the era record.|