Table 2.

Data variables and data sources

Component	Variable	Data Source
Pre-Admission
Demographics	Sex, Race/Ethnicity	CDW Patient Tables
	Age	CDW Vital Status Files
Comorbidities	Functional Status, DNR Status	VASQIP
	History of: Angina, Congestive Heart Failure, Cerebrovascular Accident, Peripheral Vascular Disease, Cardiac Surgery, Pre-operative Coma, Impaired Sensorium, Ascites, Esophageal Varices, Bleeding Disorders, Disseminated Cancer, Steroid Use, RBC Transfusion, Wound Infection, Weight Loss, Pneumonia, Ventilator Dependence, Dialysis, Acute Renal Failure
Social/Behavioral	BMI, >2 Drinks/Day in the 2 Weeks Before Admission, Pack-Years Smoking	VASQIP
	Marital Status	CDW Patient Table
	Pre-Admission Inpatient and ER Utilization	CDW Inpatient and Outpatient Tables
Preoperative Labs & Vitals	Albumin, Bicarbonate, Bilirubin, BUN, Calcium, Chloride, Serum Creatinine, Creatinine eGFR, Glucose, Hematocrit, Hemoglobin, INR, Potassium, Sodium, WBC	MCA Laboratory
	Systolic & Diastolic Blood Pressure, Pain, Pulse, Pulse Oximetry, Respiration Rate, Temperature	CDW Vital Signs
Hospital Factors	Index Hospitalization Facility	VASQIP
Operative
Complexity	Urgent/Emergent status, Inpatient/Outpatient status, Operative Time, Intraoperative RBC transfusion, Wound Classification, work RVU	VASQIP
Other	Year of Surgery, ASA classification, Anesthesia technique	VASQIP
Post-Operative
Postoperative Labs & Vitals	Albumin, Bicarbonate, Bilirubin, BUN, Calcium, Chloride, Serum Creatinine, Creatinine eGFR, Glucose, Hematocrit, Hemoglobin, INR, Potassium, Sodium, WBC	MCA Laboratory
	Systolic & Diastolic Blood Pressure, Pain, Pulse, Pulse Oximetry, Respiration Rate, Temperature	CDW Vital Signs
Pre-Discharge Complications	Cardiac Arrest, Myocardial Infarction, Coma, Cerebral Vascular Accident, Wound Disruption, Failure to Wean, Peripheral Nerve Injury, Acute Renal Failure, Organ/Space SSI, RBC Transfusion, DVT/Thrombophlebitis, Pneumonia, Pulmonary Embolism, Reintubation, Progressive Renal Insufficiency, Sepsis, Superficial Infection, Urinary Tract Infection, Deep Wound Infection	VASQIP
ICU Utilization	ICU visits during the index hospitalization	CDW Inpatient Tables
Other Postoperative	Postoperative Length of Stay, Number of Surgeries during Index Hospitalization	VASQIP
	Discharge Destination	CDW Inpatient Tables
Post-Discharge
Discharge Characteristics	Care Coordination, Caregiver Accessibility,	CTM-15
	Discharge Destination, Functional Status at Discharge, Transportation	Discharge, Readmission, and Follow-Up Interviews
Discharge Complexity	Medications, Wound Care Instructions, Mobility	Discharge Interview
Patient Characteristics at Discharge	General Health	VR-12
	Cognitive Function	SBT
	Pain at Discharge	Visual Analogue Scale
Post-Discharge Clinic Utilization	VA Clinic Stops in the 30-days post-discharge	CDW Outpatient Tables
Post-Discharge Complications	Cardiac Arrest, Myocardial Infarction, Coma, Cerebral Vascular Accident, Wound Disruption, Peripheral Nerve Injury, Acute Renal Failure, Organ/Space SSI, RBC Transfusion, DVT/Thrombophlebitis, Pneumonia, Pulmonary Embolism, Reintubation, Progressive Renal Insufficiency, Sepsis, Superficial Infection, Urinary Tract Infection, Deep Wound Infection	VASQIP
		Medical Chart Abstraction
Other	Changes in: Care Coordination, Caregiver Accessibility, Transportation, Medications	Follow-up Interview
	Pain at Follow-Up/Readmission	Visual Analogue Scale
Outcome
Inpatient Readmission	Inpatient Admission within 30-days Following Index Hospitalization Discharge	CDW Inpatient Tables
		Readmission Interview
Unplanned ER Admission	ER utilization within 30-days Following Index Hospitalization Discharge	CDW Outpatient Tables
		Readmission Interview

CDW VA’s Corporate Data Warehouse, VASQIP VA Surgical Quality Improvement Program, MCA Managerial Cost Accounting (a series of VA files), CTM Care Transitions Measures, SBT Short Blessed Test; BMI Body Mass Index, DNR Do Not Resuscitate; ER Emergency Room, BUN Blood Urea Nitrogen, eGFR Estimated Glomerular Filtration Rate, INR International Normalized Ratio, WBC White Blood Cell, RBC Red Blood Cell, RVU Relative Value Unit, ASA American Society of Anesthesiologists Physical Status Classification