Table 2 Patient’s clinical characteristics

Age

81.9 ± 5.4

76.4 ± 8.1

t = − 0.647

p = 0.000

Gender(M/F)

23/36

81/166

χ² = 0.813

p = 0.367

Hypertension (n)

27

147

χ² = 3.672

p = 0.550

Coronary heart disease (n)

35

187

χ² = 6.421

p = 0.011

Diabetes (n)

36

192

χ² = 7.006

p = 0.008

Cerebral infarction (n)

44

214

χ² = 5.240

p = 0.020

Hospitalization

24.2 ± 15.1

16.0 ± 7.2

t = − 4.102

p = 0.000

Preoperative hospitalization

5.5 ± 3.4

3.7 ± 1.7

t = − 3.677

p = 0.000

Albumin infusion

16.7 ± 33.1

1.8 ± 7.1

t = − 3.449

p = 0.000

Preoperative HCT

33.5 ± 4.9

35.2 ± 5.2

t = 2.327

p = 0.021

Postoperative HCT

28.2 ± 4.9

29.4 ± 4.8

t = 1.641

p = 0.102

BMI

22.2 ± 3.2

22.7 ± 3.2

t = 1.080

p = 0.281

Blood transfusion volume

1.4 + 2.1

0.5 ± 1.0

t = − 3.296

p = 0.002

Preoperative leucocyte count

9.6 ± 2.6

8 ± 2.1

t = − 4.072

p = 0.000

Preoperative Hb

11.3 ± 1.6

12.0 ± 5.5

t = 0.840

p = 0.402

Preoperative albumin

36.5 ± 3.7

37.8 ± 4.0

t = 2.132

p = 0.034

Preoperative TP

64.6 ± 4.8

64.7 ± 5.8

t = 0.046

p = 0.963

NYHA

2.2 ± 0.7

1.8 ± 0.6

t = − 3.606

p = 0.001

ASA

2.9 ± 0.5

2.4 ± 0.5

t = − 7.713

p = 0.000

Anesthesia

25/34

126/121

χ² = 1.422

p = 0.233

Surgery

30/29

114/133

χ² = 0.421

p = 0.516

Operation time

88.5 ± 40.3

79.0 ± 24.3

t = − 1.733

p = 0.088

The anesthesia time

157.7 ± 50.9

150.3 ± 33.4

t = − 1.066

p = 0.290

Intraoperative blood loss

127.1 ± 95.2

105.1 ± 33.4

t = − 1.666

p = 0.046

Postoperative Na+

139.0 ± 4.7

139.6 ± 4.0

t = 0.922

p = 0.357

Postoperative K+

4.3 ± 0.5

4.3 ± 0.4

t = 0.309

p = 0.758

Postoperative leucocyte count

9.6 ± 2.6

8.6 ± 2.4

t = − 2.717

p = 0.007

Postoperative Hb

9.4 ± 1.9

9.7 ± 1.6

t = 1.237

p = 0.217

DVT (N)

15

52

t = 0.523

p = 0.466