Table 1 Basic information and clinical parameters

Patients (n)

81

37

44

Sex

0.778

 Male

14

18

 Female

23

26

Mean age (years)

63.65 ± 10.50

64.86 ± 9.70

62.64 ± 11.13

0.344

Mean BMI (kg/m2)

26.48 ± 4.38

25.99 ± 4.20

26.90 ± 4.53

0.355

Screws (n) per case

4.64 ± 0.94

4.65 ± 0.95

4.64 ± 0.94

0.954

Time for single screw Placement

6.49 ± 1.33

5.58 ± 1.22

7.25 ± 0.84

P < 0.001^*

Intraoperative blood Loss (ml)

262.10 ± 109.29

248.65 ± 97.53

273.41 ± 118.20

0.313

Radiation time (min)

0.41 ± 0.10

0.37 ± 0.10

0.43 ± 0.07

0.001^*

Revision

3

0

3

0.108

Complications

 Infection

4

1

3

0.401

 Neurological injury

0

1

3

0.108