Table 4

Measurements (mean ± SD) at the L3 level, including comparisons of sex, ethnicity, and age.

DemographicVBAH (mm)VBPH (mm)VBSL (mm)VBIL (mm)VBPL (mm)SA (°)
 Total 29.4 ± 1.7 29.4 ± 1.8 35.9 ± 4.0 35.6 ± 3.8 33.5 ± 3.4 0.9 ± 2.8
Sex
 Female 29.1 ± 2.0 28.8 ± 1.8 33.2 ± 2.6 32.8 ± 2.6 31.1 ± 2.3 1.8 ± 3.1
 Male 29.6 ± 1.6 29.8 ± 1.8 37.5 ± 3.7 37.2 ± 3.5 34.9 ± 3.1 0.4 ± 2.5
 P  0.081 <0.001  <0.001  <0.001  <0.001  0.002
Ethnicity
 Māori 29.1 ± 1.6 29.1 ± 1.7 36.2 ± 3.8 36.0 ± 3.9 33.7 ± 3.2 0.9 ± 2.6
 European 29.6 ± 1.8 29.6 ± 1.9 35.8 ± 4.1 35.4 ± 3.8 33.4 ± 2.9 1.0 ± 2.9
 P  0.080 0.084 0.064 0.019  0.179 0.988
Age
 Beta (mm/yr) 0.002 0.002 0.084 0.087 0.066 0.019
 P  0.707 0.768 <0.001  <0.001  <0.001  0.055
 PH (mm)  PW (mm)  VCL (mm)  VCW (mm)  Canal:body ratio
 Total 14.4 ± 1.4 10.2 ± 2.0 14.6 ± 1.7 23.1 ± 1.9 0.47 ± 0.10
Sex
 Female 13.9 ± 1.2 9.2 ± 1.8 14.7 ± 1.4 22.6 ± 1.7 0.53 ± 0.11
 Male 14.7 ± 0.4 10.8 ± 1.9 14.6 ± 1.8 23.4 ± 1.9 0.44 ± 0.08
 P  <0.001  <0.001  0.703 0.002  <0.001
Ethnicity
 Māori 14.4 ± 1.3 10.4 ± 1.9 14.4 ± 1.3 22.8 ± 1.6 0.47 ± 0.11
 European 14.4 ± 1.5 10.1 ± 2.1 14.8 ± 1.9 23.3 ± 2.0 0.47 ± 0.10
 P  0.709 0.147 0.195 0.088 0.835
Age
 Beta (mm/y) 0.001 0.016 0.010 0.023 0.000
 P  0.895 0.021  0.117 0.001  0.197

  • 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 posterior height; VBAH, vertebral body anterior height; VBIL, vertebral body inferior length; VBPL, vertebral body pediculolaminar length; VBSL, vertebral body superior length; VCL, vertebral canal length; VCW, vertebral canal width.