Table 1.

Summary of patient demographic and clinical variables in the peritonitis data set.

Variables		Type	Value or range	Description
Variable name
	Patient_ID	String	Unique patient ID.	Patient ID
	Inpatient_ID	String	Unique inpatient ID	Inpatient ID
	Sex	Integer	0 or 1	Male or female
	Age (<20, 20-60, or >60 years)	Integer	(0-102)	Patient’s age
Inpatient variables
	DGTMa	Integer	(0-136)	The number of hospitalizations before peritonitis surgery
	Comorbidities (including malignant tumor)	String	[Mild liver disease, …, Renal disease]	17 classified comorbidities that include liver disease, according to ICD-9b coding algorithms [65]
	Operation category	String	0, 1, 2, 3, 4, 5, or 6	Seven categories in total (adopted from ICD-9-CMc): cholecystitis or cholangitis, appendicitis, hollow organ perforation, bowel ischemia, intestinal obstruction, hernia with bowel gangrene, hernia with bowel obstruction
	Complication pneumonia	Integer	0 or 1	Whether a patient has pneumonia
	Complication UTId	Integer	0 or 1	Whether a patient has UTI
	Complication SSIe	Integer	0 or 1	Whether a patient has SSI
Laboratory test results
	Albumin	Float	(0.19-5.5g per dL)	Serum albumin level
	Amylase	Float	(5-11873 U per L)	Serum amylase
	BNPf	Float	(21.49-4942 pg per ml)	Levels of B-type natriuretic peptide
	BUNg	Float	(1-281 mmol per L)	Blood urea nitrogen
	Bandh	Float	(0.3-76)	Band neutrophil
	Cai	Float	(0.8-14.49 mg per dL)	Calcium in blood
	CRj	Float	(0.07-34.2 mg per dL)	Serum creatinine
	CRPk	Float	(0.2-679.2 mg per L)	C-reactive protein test
	Hematocrit	Float	(1-63.2%)	Hematocrit test (proportion of red blood cells in the blood)
	INRl	Float	(0.79-12)	International normalized ratio of prothrombin time
	Km	Float	(1.60-18.86 mEq per L)	Blood potassium test
	Lactate	Float	(5.49-240.6 mmol per L)	Level of lactic acid
	Leukocyte (WBCn)	Float	(0.2-141.5×109 per L)	White blood cell count
	Platelets	Float	(0.7-1373×109 per L)	The number of platelets in blood
	Prealbumin	Float	(2-44.59 mg per dL)	Prealbumin in blood
	Procalcitonin	Float	(4.56-45.49 µg per L)	Blood test to diagnose sepsis
	Total bilirubin	Float	(0.1-56.54 mg per dL)	Total amount of bilirubin in blood
	Nao	Float	(10-190 mEq per L)	Blood sodium test
Target variable (crucial complication phenotype to be predicted)
	Complication phenotype	Categorical	AHEp, HRSq, or Neither

^aDGTM: number of hospitalization before peritonitis surgery.

^bICD-9: International Classification of Diseases, Ninth Revision.

^cICD-9-CM: International Classification of Diseases, Ninth Revision, Clinical Modification.

^dUTI: urinary tract infection.

^eSSI: surgical site infection.

^fBNP: B-type natriuretic peptide.

^gBUN: blood urea nitrogen.

^hBand: bandemia.

ⁱCa: calcium.

^jCR: creatinine.

^kCRP: C-reactive protein.

^lINR: international normalized ratio.

^mK: potassium.

ⁿWBC: white blood cell.

^oNa: sodium.

^pAHE: acute hepatic encephalopathy.

^qHRS: hepatorenal syndrome.