Table 3.

Variables selected by different feature selection models

Variable	Clinical	Lasso	Top AUC	Forward	Genetic
BUN	+	+	+	+	+
Time since admission		—	—	—	—
Sodium bicarbonate use		+		+	+
Glucose		+	+		+
Creatinine	+	+	+		+
Calcium	—	—	—
RBC transfusion				+	+
Loop diuretic use				+	+
Alprostadil use		+			+
Δ creatinine 48 h		+	+
Chemotherapy use	+				+
General pediatrics admission					—
Carboplatin use				+
Foscarnet use				+
Nimodipine use				+
Paclitaxel use				+
Fibrinogena				+
Oxygen saturation			—
Lymphocyte percent			—
Platelet count			—
Respiratory rate			—
INRa		+
Calcium gluconate use		+
Bicarbonate	—
Lactatea	+
ICU admission	+
Mechanical ventilation	+
Pressor use	+
Weight	+

Variables at the top were selected by several feature selection methods. RBC, red blood cell; Δ creatinine 48 h, change in serum creatinine within the last 48 h; INR, international normalized ratio.

^aTransformed into categorical variables (measured versus not measured) due to missingness >25%; +, positive correlation with AKI; –, negative correlation with AKI.