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Table 1 Comparison of patient characteristics between ULDH and LLDH groups

From: Wedge-shaped vertebrae is a risk factor for symptomatic upper lumbar disc herniation

Variable ULDH (65 cases) LLDH (65 cases) t/χ2 value P value
Age at operation (years)a 42.2 ± 8.0 43.8 ± 7.5 1.176 0.242
Sexb
 Male 33 39 1.121 0.290
 Female 32 26
Duration of disease (months)a 26.7 ± 15.7 28.6 ± 16.5 0.673 0.502
BMIa 25.0 ± 7.4 25.7 ± 6.2 0.585 0.560
History of traumab
 Yes 17 19 0.154 0.695
 No 48 46
WSVb
 Yes 29 14 7.819 0.005*
 No 36 51
WAVa 11.2 ± 6.2 3.4 ± 3.2 9.013 < 0.001*
TLa 16.3 ± 8.2 6.5 ± 4.1 8.618 < 0.001*
LLa 36.6 ± 8.2 39.1 ± 7.6 1.802 0.074
  1. ULDH upper lumbar disc herniation, LLDH lower lumbar disc herniation, BMI body mass index, WSV wedge-shaped vertebrae, WAV wedging angle of the vertebrae, TL thoracolumbar kyphotic angle, LL lumbar lordosis
  2. aIndependent t test
  3. bChi-square tests
  4. *P < 0.05