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Table 1 Characteristics of patients

From: Effect of sagittal screw angle and distance of screw apex to superior endplate on adjacent segment disease after posterolateral lumbar fusion: a retrospective study

 

Non-ASD (n = 136)

ASD (n = 53)

p

Gender (female/male)

 Female

62

27

 

 Male

74

26

0.510

Age (yr)

60.5 ± 8.7

61.3 ± 9.1

0.574

BMI (Kg/m2)

25.3 ± 1.5

25.2 ± 1.2

0.730

Follow-up (yr)

3.5 ± 1.5

3.8 ± 1.4

0.108

Osteoporosis

 Without

126

40

 

 With

10

13

0.001

Pfirrmann

 Grade 1

1

0

 

 Grade 2

25

3

 

 Grade 3

64

30

 

 Grade 4

46

20

0.109

Distance (mm)

6.8 ± 0.8

6.0 ± 0.6

 < 0.001

Horizontal screw angle (°)

16.3 ± 2.4

16.4 ± 2.0

0.861

Sagittal screw angle (°)

4.5 ± 1.1

5.7 ± 1.2

 < 0.001

VAS

5.1 ± 1.1

6.7 ± 1.5

 < 0.001

ODI

14.4 ± 3.2

20.0 ± 3.7

 < 0.001

PI-LL (°)

18.3 ± 6.6

18.3 ± 6.6

0.987

SS (°)

31.9 ± 4.5

31.8 ± 2.9

0.862

PT (°)

22.1 ± 4.4

23.0 ± 3.0

0.166

PI (°)

54.0 ± 5.9

54.8 ± 4.8

0.385

  1. BMI, Body mass index; VAS, Visual analogue scale; ODI, Oswestry disability index; Distance, The distance between pedicle screw apex and superior endplate; SS, Sacral slope; PT, Pelvic tilt; PI-LL, Pelvic incidence minus lumbar lordosis
  2. Boldface values indicate p < 0.05