Definition of feature variables
chronic kidney disease, Coma, hyperlipidemia, malignancy, infection, hypertension
INFECTION, HYPERTENSION, COMA, HYPERLIPIDEMIA
The 22 feature variables retained for analysis were age, sex, body mass index (BMI), vital signs at triage (Glasgow Coma Scale [GCS], systolic blood pressure, heart rate, respiratory rate, and body temperature), bedridden, nasogastric tube feeding, history of hypertension (ICD-9-CM: 401–405 or ICD-10: I10–I16), hyperlipidemia (ICD-9-CM: 272.0–272.5, 277.7 or ICD-10: E78.0–E78.5, E88.81), malignancy (ICD-9-CM: 140–208 or ICD-10: C00–C69), chronic kidney disease (ICD-9-CM: 585 or ICD-10: N18), and laboratory data, including blood urea nitrogen, serum creatinine, white blood cell count, hemoglobin, glucose, and high sensitive C-reactive protein (hs-CRP), as well as concomitant infection (ICD-9-CM: 001–139, 320–326, 390–392, 480–488, 540–543, 555–558, 566–567, 599.0, 601, 604, 614–616, 680–686, 730 or ICD-10: A00–B99, G00–G09, I00–I02, J09–J18, K35–K38, K50–K52, K61, K65, N39.0, N41, N45, N70–N77, L00–L08, M86, R65). The feature variables were suggested predictors of adverse outcomes in previous studies, and possible risk factors for adverse outcomes in clinical practice [