Table 1 Baseline demography characteristics in two cohorts

Age (years) ^a

65.9 ± 7.8

66.3 ± 6.2

Gender (male/female) ^b

23-Jun

24-Jun

BMI ^a

26.4 ± 2.5

27.0 ± 3.1

Length of hospitalization (days) ^a

6.0 ± 0.5

6.1 ± 0.4

Postoperative hospital stay (days) ^a

3.1 ± 0.3

3.1 ± 0.4

Comorbidities ^b

 Hypertension

9

8

 Diabetes

2

2

 Chronic bronchitis

1

0

 Anemia

0

1

 Autoimmune disease

1

1

 Osteoporosis

11

13

Preoperative laboratory values ^a

 Hematocrit (%)

41.7 ± 2.8

41.6 ± 3.6

 Hemoglobin (g/L)

133.5 ± 11.2

133.9 ± 13.5

 Platelet counts (10^9/L)

204.1 ± 63.2

188.5 ± 54.4

 Thrombin time (s)

17.2 ± 0.8

17.1 ± 0.7

 APTT (sec)

25.7 ± 2.3

25.6 ± 2.0

 INR

0.97 ± 0.05

0.95 ± 0.06

 PT (sec)

10.7 ± 0.6

10.5 ± 0.7

 Fibrinogen(g/L)

2.9 ± 0.6

3.0 ± 0.4

 FDP(mg/L)

2.8 ± 1.3

2.9 ± 1.9

 D-dimers (mg/L)

0.71 ± 1.12

0.57 ± 0.49

 Total protein (g/L)

72.4 ± 4.1

72.2 ± 4.6

 Albumin(g/L)

45.7 ± 3.2

45.6 ± 2.9

 CRP (mg/L)

4.2 ± 2.1

3.6 ± 2.6

 IL-6 (pg/ml)

4.2 ± 2.8

3.3 ± 1.6

Pain VAS score ^a

5.2 ± 1.8

4.9 ± 1.1