Table 2.

Patient demographic and clinical information (Quantitative data)

Variable	Mean ± SD	95% CI
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