Table 1 Preoperative demographics

Age* (year)

62.7 (10.4)

62.0 (12.3)

0.816

Gender (M/F)

4/29

9/28

0.230

BMI*

26.0 (3.7)

26.3 (3.4)

0.668

ASA grade*

2.0 (0.5)

2.0 (0.6)

0.886

Involved diseases

OA

4

6

0.616

RA

29

31

Preoperative Hb* (g/L)

131.2 (5.9)

132.1 (5.6)

0.514

Preoperative Hct* (%)

40.2 (1.5)

40.4 (2.7)

0.701

Preoperative serum level of albumin* (g/L)

43.0 (3.5)

42.9 (4.6)

0.947

Preoperative VAS pain score*

8.1 (0.9)

8.1 (1.0)

0.821

Preoperative HSS (points)*

38.7 (9.8)

38.2 (6.5)

0.739