Table 3

Measurements (mean ± SD) at the L2 level, including comparisons of sex, ethnicity, and age.

DemographicVBAH (mm)VBPH (mm)VBSL (mm)VBIL (mm)VBPL (mm)SA (°)
 Total 28.4 ± 1.7 30.0 ± 1.8 35.0 ± 3.9 35.4 ± 3.8 32.4 ± 3.5 -1.8 ± 3.0
Sex
 Female 28.4 ± 1.8 29.3 ± 1.8 32.1 ± 2.5 32.7 ± 2.6 30.2 ± 2.4 -1.1 ± 2.9
 Male 28.5 ± 1.7 30.3 ± 1.7 36.6 ± 3.7 36.9 ± 3.6 33.7 ± 3.4 -2.3 ± 2.9
 P  0.620 <0.001  <0.001  <0.001  <0.001  0.007
Ethnicity
 Māori 28.1 ± 1.7 29.7 ± 1.7 35.5 ± 4.1 35.7 ± 3.8 32.5 ± 3.8 -2.0 ± 2.3
 European 28.6 ± 1.7 30.1 ± 1.8 34.6 ± 3.8 35.2 ± 3.8 32.3 ± 3.3 -1.7 ± 3.3
 P  0.035  0.052 0.010  0.053 0.231 0.705
Age
 Beta (mm/yr) 0.004 -0.002 0.076 0.075 0.067 0.022
 P  0.516 0.719 <0.001  <0.001  <0.001  0.041
 PH (mm)  PW (mm)  VCL (mm)  VCW (mm)  Canal:body ratio
 Total 14.6 ± 1.3 8.2 ± 1.7 15.3 ± 1.6 22.6 ± 1.8 0.51 ± 0.12
Sex
 Female 14.1 ± 1.2 7.3 ± 1.5 15.2 ± 1.4 22.0 ± 1.8 0.57 ± 0.12
 Male 14.9 ± 1.3 8.7 ± 1.5 15.4 ± 1.7 22.9 ± 1.7 0.48 ± 0.10
 P  <0.001  <0.001  0.392 <0.001  <0.001
Ethnicity
 Māori 14.6 ± 1.2 8.1 ± 1.7 15.0 ± 1.4 22.2 ± 1.6 0.52 ± 0.13
 European 14.6 ± 1.4 8.3 ± 1.7 15.4 ± 1.7 22.8 ± 1.9 0.51 ± 0.10
 P  0.891 0.670 0.116 0.058 0.663
Age
 Beta (mm/y) -0.005 0.017 0.004 0.023 -0.001
 P  0.338 0.003  0.488 <0.001  0.041

  • 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.