Table 2 Patient demographic and clinical information (Quantitative data)

Age(years)

65.41 ± 8.66

63.41–67.13

Operation duration(h)

6.36 ± 1.08

6.15–6.58

Preoperative Hct

42.58 ± 3.78

41.82–43.29

Postoperative Hct

36.70 ± 4.84

35.74–37.66

Thickness of the dorsal extensor group (mm)

38.40 ± 6.93

37.03–39.78

Thickness of the subcutaneous fat (mm)

17.62 ± 7.62

16.11–19.14

Thickness of the psoas (mm)

30.76 ± 7.04

29.36–32.16

TBL(ml)

645.59 ± 376.37

570.91–720.27

HBL(ml)

421.39 ± 337.45

354.43–488.35

Proportion OF HBL (%)

57 ± 26

53–62