Table 1 Demographic and clinical characteristics of the study patients

Number of males

64

68.8%

Age (years) median (IQR)

74

(66-78)

Education (years): < 8

33

35.4%

8-13

53

60.6%

> 13

7

7.5%

MMSE adjusted median (IQR)

26

(25-28)

Use of any benzodiazepines

11

11.8%

Use of any antidepressants

8

8.6%

Use of antihypertensive drugs

78

83.8%

Use of B-blockers

22

23.6%

Use of any statins

24

25.8%

Smoking habits: no

25

26.9%

former

55

59.1%

yes

13

14.0%

Alcohol: no

49

52.6%

   sometimes

31

33.4%

   every day

13

14.0%

Type of surgery: General

24

25.8%

Orthopaedic

33

35.4%

Urologic

36

38.8%

Type of anaesthesia: regional ± general

19

20.5%

general

74

79.5%

ICU and hospital course

SAPS II median (IQR)

29

(24-43)

Number of patients ventilated

41

44.0%

Duration of ventilation (h) median (IQR)

6

(4-19)

Number of patients with delirium in ICU

6

6.4%

ICU LOS^a (days) median (IQR)

2

(1-3)

Hospital LOS^a (days) median (IQR)

7

(5-10)