Table 2

Measurements (mean ± SD) at the L1 level, including comparisons of sex, ethnicity, and age.

DemographicVBAH (mm)VBPH (mm)VBSL (mm)VBIL (mm)VBPL (mm)SA (°)
Total 26.4 ± 1.9 29.7 ± 1.8 33.2 ± 3.9 34.3 ± 4.0 31.1 ± 3.6 -5.0 ± 3.6
Sex
 Female 26.3 ± 2.0 29.0 ± 1.7 30.7 ± 2.7 31.5 ± 3.0 28.7 ± 2.5 -4.4 ± 3.7
 Male 26.5 ± 1.9 30.2 ± 1.6 34.7 ± 3.6 35.9 ± 3.6 32.5 ± 3.4 -5.3 ± 3.6
 P  0.445 <0.001  <0.001  <0.001  <0.001  0.127
Ethnicity
 Māori 25.9 ± 1.7 29.5 ± 1.7 33.6 ± 4.3 34.8 ± 4.2 31.4 ± 3.6 -4.9 ± 4.4
 European 26.7 ± 2.0 29.9 ± 1.8 33.0 ± 3.6 33.9 ± 3.8 31.0 ± 3.6 -5.0 ± 3.1
 P  0.003  0.083 0.038  0.007  0.093 0.865
Age
 Beta (mm/yr) -0.009 -0.004 0.082 0.078 0.070 0.006
 P  0.201 0.537 <0.001  <0.001  <0.001  0.651
 PH (mm)  PW (mm)  VCL (mm)  VCW (mm)  Canal:body ratio
 Total 15.1 ± 1.3 7.8 ± 1.6 16.5 ± 1.6 22.4 ± 1.8 0.57 ± 0.13
Sex
 Female 14.6 ± 1.3 6.9 ± 1.6 16.3 ± 1.3 21.8 ± 1.9 0.63 ± 0.11
 Male 15.5 ± 1.2 8.3 ± 1.4 16.5 ± 1.8 22.7 ± 1.7 0.53 ± 0.13
 P  <0.001  <0.001  0.265 <0.001  <0.001
Ethnicity
 Māori 15.0 ± 1.2 7.5 ± 1.5 16.2 ± 1.4 22.1 ± 1.4 0.57 ± 0.11
 European 15.2 ± 1.4 8.0 ± 1.7 16.6 ± 1.8 22.6 ± 2.0 0.57 ± 0.14
 P  0.183 0.012  0.108 0.162 0.611
Age
 Beta (mm/y) 0.008 0.016 -0.002 0.019 -0.001
 P  0.082 0.004  0.736 0.003  0.013

  • Note: Canal:body ratio, ratio of canal length to vertebral body length at the pediculolaminar level.

  • PH, pedicle height; PW, pedicle width; SA, segmental angle; VBAH, vertebral body anterior height; VBIL, vertebral body inferior length; VBPH, vertebral body posterior height; VBPL, vertebral body pediculolaminar length; VBSL, vertebral body superior length; VCL, vertebral canal length; VCW, vertebral canal width.