Table 8 Separate multivariate regression analysis for the Risk, Injury, Failure, Loss of Kidney Function, End-stage Kidney Disease (RIFLE) and the Acute Kidney Injury Network (AKIN) classifications

RIFLE criteria (creatinine + urine output)

   Risk

2.69 (1.49 to 4.88)

0.001

0.733

   Injury

2.01 (1.03 to 3.89)

0.038

   Failure

3.59 (2.01 to 6.42)

< 0.0001

   Any category

2.78 (1.74 to 4.45)

< 0.0001

AKIN criteria (creatinine + urine output)

   Stage 1

3.54 (1.97 to 6.37)

< 0.0001

0.750

   Stage 2

2.71 (1.33 to 5.53)

0.006

   Stage 3

4.66 (2.49 to 8.73)

< 0.0001

   Any stage

3.59 (2.14 to 6.01)

< 0.0001

RIFLE criteria (creatinine)

   Risk

2.63 (1.46 to 4.75)

0.001

0.729

   Injury

2.12 (1.1 to 4.08)

0.025

   Failure

3.2 (1.8 to 5.7)

< 0.0001

   Any category

2.68 (1.69 to 4.25)

< 0.0001

AKIN criteria (creatinine)

   Stage 1

3.18 (1.79 to 5.64)

< 0.0001

0.745

   Stage 2

2.74 (1.35 to 5.56)

0.005

   Stage 3

3.93 (2.12 to 7.28)

< 0.0001

   Any stage

3.38 (2.05 to 5.57)

< 0.0001

RIFLE criteria (urine output)

   Risk

1.3 (0.35 to 4.8)

0.689

0.619

   Injury

0.83 (0.31 to 2.21)

0.711

   Failure

3.26 (1.74 to 6.13)

< 0.0001

   Any category

2.06 (1.24 to 3.42)

0.005

AKIN criteria (urine output)

   Stage 1

1.03 (0.3 to 3.58)

0.953

0.612

   Stage 2

1.03 (0.35 to 2.99)

0.953

   Stage 3

2.65 (1.45 to 4.84)

0.001

   Any stage

1.9 (1.16 to 3.14)

0.01