Table 1.

Clinical variables considered in building AKI predictive models

Feature category	Number of variables	Details
Demographics	3	Age, gender, and race
Vitals	5	BMI, diastolic BP, systolic BP, pulse, and temperature
Lab tests	14	Albumin, ALT, AST, ammonia, blood bilirubin, BUN, Ca, CK-MB, CK, glucose, lipase, platelets, troponin, and WBC
Comorbidities	29	UHC comorbidity
Admission diagnosis	315	UHC APR-DRG
Medications	1271	All medications are mapped to RxNorm ingredient
Medical history	280	ICD9 codes mapped to CCS major diagnoses

Abbreviations: AKI: acute kidney injury; BMI: body mass index; BP: blood pressure; ALT: alanine aminotransferase; AST: asparate aminotransferase; BUN: Blood Urea Nitrogen; CK-MB: Creatine Kinase-muscle/brain; WBC: white blood cell; UHC: University Healthsystem Consortium (http://www.vizientinc.com); APR-DRG: all patient refined diagnosis related group; CCS: Clinical Classifications Software; CK: Creatine Kinase.