Table 3 Comparison of the prevalence of rASD

Age (y)

56.6 ± 11.7

49.4 ± 11.7

/

< 0.001^*

Follow-up time (moth)

37.2 ± 22.3

29.4 ± 23.2

/

0.011^*

Adjacent segment

Total

77

217

26.2%

/

Cephalic

55

139

28.4%

0.241

Cauda

22

78

22.0%

Diseases

Disc herniation

54

114

32.1%

0.96

Spinal stenosis

25

54

36.2%

Degenerative spondylolisthesis

16

31

34.0%

Fusion levels

1 level

44

168

20.8%

< 0.001^*

2 levels

19

37

33.9%

≥ 3 levels

14

12

53.8%