Table 2.

Top 10 features selected by the extreme gradient boost (XGBoost) and least absolute shrinkage and selection operator (LASSO) algorithms.

Type	Important features
Basic information	Age at index hospitalization
Charlson comorbid condition	Diabetes without complication, Chronic kidney disease, Severe liver diseases
Prior use of nephrotoxic medicine	RASa inhibitors/K-sparing diuretics
Baseline laboratory result	Serum creatinine, eGFRb, BUNc, Calcium, Phosphorus

^aRAS: renin-angiotensin system.

^beGFR, estimated glomerular filtration rate (175 × SCr − 1.154 × age − 0.203 × [0.742, female]).

^cBUN: blood urea nitrogen.