Table 1.

Number of data items mapped to each concept class

Mapped OMOP CDM Class	Count (N=1,431)	Examples
Measurement	529	Charlson comorbidity index score, Ejection fraction, Vital signs
Observation	319	Treatment history, Smoking status, Marital status, Catheter leakage
Condition_Occurrence	223	Problem list, Admitting diagnoses
Procedure_Occurrence	109	Renal transplant, Chemotherapy, Detoxification protocol, Relaxation
Person	94	Age, Race, Gender, Ethnicity
Drug_Exposure	48	Opioid dose, Type of opioid used, Pain medication
Device_Exposure	25	Mechanical ventilator use, Traction device type, CPAP use
Visit_Occurrence	27	Admission date, Discharge date
Care_Site	15	Type of hospital, Admitting service
Provider	3	APN specialty, Service provider type
Payer_Plan_period	6	Payer, Health insurance type, Insurance status
Visit_Cost	5	Average cost per patient per patient day, Average cost per patient
Drug_Era	4	Period of hormone therapy, Period of chemotherapy
Death	4	Hospital death, Death
Procedure_Cost	3	Wound dressing cost, Overhead
UNMAPPED	17	Influence of ward condition, Counselor’s age, Hygiene compliance