Table 4 Uni- and multivariable logistic regression on the risk of acute kidney injury

Baseline s-creatinine, µmol l ⁻¹

1.97 (1.33–2.90)

0.0007

1.35 (0.81- 2.25)

0.25

Age group

 < 0.0001

0.10

  < 60 years

1.00 (ref)

1.00 (ref)

  > 60–70 years

3.86 (2.07–7.18)

2.18 (1.00–4.75)

  > 70–80 years

3.50 (1.85–6.63)

1.99 (0.88–4.47)

  > 80 years

5.54 (2.93–10.48)

2.87 (1.22–6.72)

Female

0.94 (0.63–1.39)

0.74

1.04 (0.61–1.78)

0.89

Performance score

0.03

0.70

  0

1.00 (ref)

1.00 (ref)

  1

1.78 (1.13–2.80)

1.24 (0.67–2.29)

  ≥ 2

1.73 (0.84–3.55)

1.41 (0.51–3.85)

Heart Failure

1.50 (0.66–3.40)

0.33

0.70 (0.23–2.12)

0.53

Hypertension

3.70 (2.42–5.65)

 < 0.0001

2.90 (1.65–5.10)

0.0002

Diabetes

2.07 (1.20–3.58)

0.009

1.81 (0.89–3.69)

0.10

Peritoneal Contamination

 < 0.0001

0.004

  None

1.00 (ref)

1.00 (ref)

  Minimal

1.05 (0.58–1.91)

1.02 (0.50–2.09)

  Local pus/abscess

0.92 (0.42–2.03)

0.78 (0.29–2.10)

  Diffuse pus or faeces

3.49 (2.13–5.73)

2.99 (1.58–5.64)

Peroperative blood loss

0.71

0.55

  < 100 ml

1.00 (ref)

1.00 (ref)

  100-500 ml

1.07 (0.52–2.20)

0.90 (0.37–2.19)

  > 500 ml

0.55 (0.12–2.42)

0.30 (0.03–2.70)

qSOFA ^a

0.02

0.51

  0

1.00 (ref)

1.00 (ref)

  1

1.68 (1.04–2.71)

1.36 (0.76–2.42)

  ≥ 2

2.56 (1.25–5.24)

1.49 (0.65–3.41)