Table 1. Features included in the AdaBoost v1 and v2 models.

Model	Initial model		Revised model (additional features)
Admission details	Admission diagnosis Date/Time Admitting physician Admitting ward Admitting division HCDP code Primary care provider (PCP) PCP location
Sociodemographics	Year of birth Ethnicity/Race Sex/Gender Marital status Military grade Insurance coverage Home Zip code		Military rank
Comorbidities	Acute coronary syndrome Alcohol abuse Anemia Arrhythmia Asthma Atherosclerosis Cancer Cardiorespiratory failure CHF CKD Cerebrovascular disease Complicated diabetes Connective tissue disorder COPD Dementia Depression Fluid disorders Gastrointestinal disorder Other liver disease	HIV Lung disorder Malnutrition Myocardial Infarction Nephritis Other heart disease Paralysis Peptic ulcer PVD Other psychiatric disorder Renal failure Rheumatic Sepsis Solid tumor Ulcer Uncomplicated diabetes Urinary tract disorder Pneumonia	Charlson Comorbidity Index
Vital signs	Heart rate Respiratory rate Temperature Systolic blood pressure Diastolic blood pressure Pain score
Pharmacy			Number of prescriptions Number of new prescriptions Rx filled (total) Rx dispensed (index admission) Rx dispensed (prior to admission) Medication type (NDC class)
Laboratory results	Sodium, glucose, calcium, potassium, creatinine, blood urea nitrogen, total protein, albumin, total cholesterol, white blood cell count, red blood cell count, hemoglobin, hematocrit, platelets, international normalized ratio (INR), alanine transaminase (ALT), aspartate transaminase (AST), bilirubin, brain natriuretic peptide (BNP), pro-BNP

Abbreviations: CHF, congestive heart failure; CKD, chronic kidney disease; COPD, chronic obstructive pulmonary disease; HCDP, health care delivery program; HIV, human immunodeficiency virus; PCP, primary care provider; NDC, National Drug Class; PVD, peripheral vascular disease; Rx, prescriptions.