Table 1 Demographic date

N

30

30

32

Age (year)

56.1 ± 12.9

55.6 ± 12.3

56.7 ± 13.4

 Males

12

13

13

 Females

18

17

19

BMI (kg/cm2)

24.83 ± 3.6

24.93 ± 3.3

24.81 ± 3.4

Preoperative HGB (g/L)

123.2 ± 10.5

125.1 ± 9

126.4 ± 8.4

Surgical level

2.31 ± 0.09

2.76 ± 0.12

2.40 ± 0.10

Operative time (min)

118.0 ± 24

150.6 ± 47

135.6 ± 39

Blood loss (ml)

202.5 ± 25

292.7 ± 39

259.8 ± 37

Mean duration of hospital stay (days)

6.82 ± 1.2

6.89 ± 1.3

7.3 ± 1.3