Table 1 Patient characteristics

Total

250

349

Level of lesions

 L5

157

217

 Non-L5

70

132

 L2

1

5

 L3

18

32

 L4

51

95

 Multi-level

23

n/a

Sex

 Male

200

284

 Female

50

65

Mean age (years)

14.3

14.3

Spina bifida occulta

 With

133

179

 Without

117

170

Main side stage

 Pre-lysis

n/a

117

 Early

n/a

151

 Progressive

n/a

81

Unilateral

n/a

128

Bilateral

n/a

221

Contralateral side stage

 None (= unilateral)

n/a

128

 Pre-lysis

n/a

49

 Early

n/a

76

 Progressive

n/a

57

 Terminal

n/a

38

 Pedicle fracture

n/a

1

Mean conservative treatment duration (days)

n/a

110