Table 3 Univariable risk regression of ICU delirium

Age group (years)

 <40 (n, %)

1.00

Reference

 40–70 (n, %)

1.68

0.89–3.16

0.107

 >70 (n, %)

2.26

1.20–4.26

0.011

Male

1.20

0.87–1.65

0.259

Smoking

1.77

1.30–2.40

<0.001

Chronic renal failure

1.70

1.11–2.61

0.015

Hypoalbuminemia (<2.5 versus ≥2.5 g/dl)

1.92

1.37–2.67

<0.001

Emergency surgery

4.50

3.08–6.58

<0.001

Upper abdominal surgery

1.37

0.99–1.89

0.056

Lower abdominal surgery

0.95

0.67–1.35

0.799

Thoracic surgery

2.46

1.45–4.91

0.001

Higher APACHE II score (>24 versus ≤24)

1.09

1.07–1.11

<0.001

Sepsis

8.24

5.94–11.45

<0.001

Mechanical ventilation

4.00

2.53–6.29

<0.001

Exposure to sedative medications

7.01

5.05–9.74

<0.001

Exposure to analgesic medications

0.83

0.56–1.25

0.386