Table 4 The variable assignments of multivariate logistic regression

AKI

Y

No = 1, Yes = 2

Diabetes

X₁

No = 1, Yes = 2

Pulmonary infection

X₂

No = 1, Yes = 2

Albumin(g/L)

X₃

 > 24 = 1, ≤ 24 = 2

Serum creatinine (μmol/L)

X₄

 < 90 = 1, ≥ 90 = 2

Blood urea nitrogen(mmol/L)

X₅

 < 6.5 = 1, ≥ 6.5 = 2

Uric acid (μmol/L)

X₆

 < 390 = 1, ≥ 390 = 2

Renal tubular casts

X₇

No = 1, Yes = 2