Table 2 Characteristics of patients with postoperative delirium according to the anesthetic methods

Occurrence rate, delirium No./total No.

19/47

21/31

0.02^a

Number of occurrence, No. (%)

0.06^c

 POD 1

5 (26.4)

9 (42.8)

 POD 2

3 (15.8)

6 (28.6)

 POD 3

4 (21.1)

4 (19.0)

 POD 4

5 (26.3)

1 (4.8)

 POD 5

2 (10.5)

1 (4.8)

 POD 6

0 (0.0)

0 (0.0)

 POD 7

0 (0.0)

0 (0.0)

Onset day, median (min ~ max)

3 (1 ~ 5)

2 (1 ~ 5)

0.07^d

Days of duration, median (min ~ max)

4 (2 ~ 13)

3 (2 ~ 33)

0.39^d

 Total

19.8 (4.7)

18.3 (5.0)

0.34^e

 Cognitive

10.8 (2.9)

9.5 (3.2)

0.18^e

 Non-cognitive

8.9 (2.5)

8.8 (2.8)

0.87^e

Difference in MMSE scores: the onset day minus pre-op day, median (min ~ max)

-6.5 (-25 ~ -3)

-4 (-21 ~ -1)

0.45^d

Days of hospitalization, median (min ~ max)

11 (7 ~ 36)

9 (7 ~ 45)

0.39^d

 COPD

0 (0.0)

0 (0.0)

-

 Cerebrovascular disease

4 (21.1)

0 (0.0)

0.04^b

 CABG/MI/CAD

4 (21.1)

3 (14.3)

0.69^b

 Chronic renal insufficiency

0 (0.0)

0 (0.0)

-

 Opiates

0 (0.0)

0 (0.0)

-

 Benzodiazepines

3 (15.8)

5 (23.8)

0.70^b

 Antidepressants

6 (31.6)

3 (14.3)

0.27^b

 Anticholinergics

2 (10.5)

3 (14.3)

0.72^b

 Other psychotics

2 (10.5)

1 (4.8)

0.60^b

ASA PS, No. (%)

0.80^c

 2

3 (15.8)

4 (19.0)

 3

15 (78.9)

16 (76.2)

 4

1 (5.3)

1 (4.8)

 Propofol dose, median (min ~ max), mcg/kg/min

11.7 (4.5 ~ 33.3)

-

-

 Fentanyl use, No. (%)

19 (100.0)

5 (23.8)

0.00^a

 Fentanyl dose, median (min ~ max), mcg/kg

17.5 (0.5 ~ 22.8)

0.00 (0.00 ~ 2.7)

0.00^d

 Midazolam use, No. (%)

1 (5.3)

2 (9.5)

0.61^b

 Midazolam dose, median (min ~ max), mg/kg

0.00 (0.00 ~ 0.02)

0.00 (0.00 ~ 0.06)

0.83^d