Table 1 Patient demographic data

Age

48.28 ± 2.44

50.10 ± 1.77

0.55^a

Males/females

18/27

17/29

0.46^b

Mean follow-up (months)

28.78 ± 0.61

29.90 ± 0.78

0.27^a

Mean BMI (kg/m²)

24.64 ± 1.22

25.03 ± 1.64

0.28^a

 L4–S1

27

29

Operation duration (h)

5.4 ± 1.2

6.8 ± 1.8

<0.01^a

Blood loss (ml)

448.2 ± 219.6

602.2 ± 212.9

<0.01^a