Table 1 Patients demographic characteristics

Age, years, mean ± SD

56.8 ± 11.2

56.6 ± 11

0.97

Gender, number of patients

0.5

Male

16

11

Female

9

9

Weight, kg, mean ± SD

61.6 ± 11.7

60.5 ± 12.9

0.6

Surgery, number of patients

CABG

4

3

0.94

Cardiac value replacement

17

13

Congenital heart disease

4

4

Operative time, hours, mean ± SD

3.3 ± 1.2

3.3 ± 0.7

0.96

Cardiopulmonary bypass, number of patients

Yes

19

14

0.7

No

6

6

APACHE II scores on admission, mean ± SD

20 ± 3.1

21.2 ± 2.9

0.75

Preoperative cardiac function score, number of patients

П

3

3

0.6

Ш

21

17

IV

1

0

Duration of mechanical ventilation, hours, mean ± SD

22 ± 10.1

22.7 ± 9.5

0.8

Length of ICU stay, hours, mean ± SD

58.9 ± 20

53.0 ± 16

0.29

Length of hospital stay, days, mean ± SD

22.6 ± 10.8

20.7 ± 6.1

0.5

Preoperative PSQI, mean ± SD

7.5 ± 3.7

8.6 ± 4.5

0.3

Discharge outcomes of hospital, number of patients

No death

23

20

0.4

mortality

2

0