Table 1 Demographic data of the patients in AUSS and UBE groups

Number of patients

240

235

/

/

Age

56.7 ± 7.8

57.9 ± 6.9

1.775

0.0766

Sex(male/female)

145/95

123/112

3.15

0.0759

BMI

24.3 ± 2.3

24.6 ± 2.1

1.484

0.1386

Duration of disease(months)

18.8 ± 7.8

19.4 ± 8.6

0.7968

0.426

Diseased segment

L2/3

1

2

0.709

0.8711

L3/4

12

10

L4/5

124

117

L5/S1

103

106

Type of spinal canal stenosis (Central/lateral recess/mixed)

29/38/173

40/23/172

5.393

0.0674