Table 4 The general information of two groups of patients

Sex (cases (percentage, %))

Male

34 (56.7)

26 (43.3)

0.821¹

0.365

Female

9 (45.0)

11 (55.0)

Diabetes (cases (percentage, %))

No

34 (55.7)

27 (44.3)

0.408¹

0.523

Yes

9 (47.4)

10 (52.6)

Drinking (cases (percentage, %))

No

17 (53.1)

15 (46.9)

0.008¹

0.927

Yes

26 (54.2)

22 (45.8)

Hypertension (cases (percentage, %))

No

17 (63.0)

10 (37.0)

1.392¹

0.238

Yes

26 (49.1)

27 (50.9)

Other postoperative complications (cases (percentage, %))

No

29 (48.3)

31 (51.7)

2.833¹

0.092

Yes

14 (70.0)

6 (30.0)

Education level (cases (percentage, %))

Illiteracy

4 (57.1)

3 (42.9)

1.530¹

0.675

Primary school

16 (55.2)

13 (44.8)

Junior high school

9 (42.9)

12 (57.1)

High school and above

14 (60.9)

9 (39.1)

Age (x̄± s)

52.98 ± 13.20

53.81 ± 11.08

 − 0.303²

0.763

Preoperative blood lactic acid (mmol/L, M(P₂₅, P₇₅))

2.50 (1.80, 3.90)

2.30 (1.50, 3.78)

 − 0.584³

0.559

Deep hypothermic circulatory arrest time (min, M(P₂₅, P₇₅))

22.00 (19.00, 26.00)

21.00 (17.50, 28.00)

 − 0.213³

0.831

Length of hospital stays in the intensive care unit (days, M(P₂₅, P₇₅))

7.00 (5.00, 9.00)

6.00( 5.00, 6.00)

 − 1.891³

0.059