Table 1 Clinical information between groups

No. of patients (n)

34

125

Males/females (n)

19/15

68/57

0.8786

Mean age

57.24 ± 11.86

56.51 ± 11.64

0.7494

Smoker(%)

32.4%

16.8%

0.1286

Drink (%)

23.5%

17.6%

0.6589

Diabetes mellitus (%)

11.8%

10.4%

0.8208

Hypertension (%)

35.3%

15.2%

0.1020

Hospital stay

15.97 ± 6.92

12.78 ± 4.67

0.0019

Waiting period to surgery (m)

0.94 ± 0.43

25.80 ± 35.24

< 0.0001

Blood loss (ml)

160.0 ± 214.0

113.3 ± 108.8

0.0814

Surgery time (min)

158.4 ± 58.39

145.7 ± 57.66

0.2568

MR T2-hyperintensity (%)

88.2%

24.8%

< 0.0001

Congenital spinal stenosis (%)

8.8%

10.4%

0.7881

Degenerative spinal stenosis (%)

70.6%

56.8%

0.1479

OPLL (local) (%)

5.9%

7.2%

0.7900

 Pre-operation

14.00 ± 1.97

13.94 ± 1.82

0.8760

 Final FU

16.62 ± 0.78

16.57 ± 0.75

0.7360

 Anterior surgery

76.5%

90.4%

0.0689

 Posterior surgery

20.6%

8.8%

0.0188

 Anterior + posterior surgery

2.9%

0.8%

0.3236

 Mean FU (m)

68.56 ± 14.00

62.66 ± 19.95

0.1076