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Table 3 Spinal measurements and polynomial coefficients calculated from group of 70 subjects

From: Optimization of the examination posture in spinal curvature assessment

Parameter Posture A Posture G Comparison G − A
   M SD M SD Δ P
shift [mm] 16.8 21.7 32.1 18.2 15.3 <0.001*
tilt [°] 2.4 1.9 5.7 2.1 3.2 <0.001*
α C [°] 7.8 8.8 7.1 9.0 −0.7 0.261
α T [°] 44.2 8.7 45.4 9.2 1.2 0.070
α L [°] 39.3 12.2 38.6 10.3 −0.7 0.305
b 0 [mm] 16.8 19.2 47.6 18.2 30.8 <0.001*
b 1 [mm] 1.9 8.2 15.0 8.3 13.1 <0.001*
b 2 [mm] 36.2 9.7 35.9 9.7 −0.3 0.496
b 3 [mm] 16.8 6.4 17.3 6.6 0.5 0.085
b 4 [mm] −8.9 3.5 −8.0 3.7 0.9 <0.001*
b 5 [mm] 0.4 3.1 0.6 2.9 0.2 0.197
b 6 [mm] −1.2 2.2 −1.2 2.3 0.0 0.877
  1. Posture A – free standing position.
  2. Posture G – standing position supported by a fixation frame.
  3. M – arithmetic mean.
  4. SD – standard deviation.
  5. Δ – difference of parameters.
  6. P – significance of paired t-test.
  7. shift – sagittal shift.
  8. tilt – sagittal tilt.
  9. α C – angle of cervical lordosis.
  10. α T – angle of thoracic kyphosis.
  11. α L – angle of lumbar lordosis.
  12. b 0, b 1,…, b 6 – polynomial coefficients in the sagittal plane.
  13. * – statistically significant (p < 0.05).