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Table 2 Differences (mean ± standard deviation) between upright (X), prone (CT), and supine (MRI) positions for Cobb angle, thoracic kyphosis, lumbar lordosis, and apical vertebral rotation in the thoracic as well as lumbar curves. According to the Bland-Altman plot, the P value showed if there is agreement by using the t test. If this test showed no significant different (P > 0.05), a regression analysis was performed to see is if there is agreement, written in brackets

From: Upright, prone, and supine spinal morphology and alignment in adolescent idiopathic scoliosis

  Upright Prone Supine P value
X vs. CT X vs. MRI CT vs. MRI
Thoracic
 Cobb (°) 68.2 ± 15.4 53.9 ± 14.8 56.7 ± 13.5 <0.001 <0.001 <0.001
 Kyphosis (°) 25.8 ± 11.4 22.4 ± 11.6 17.3 ± 9.8 0.004 <0.001 <0.001
 Vertebral rotation (°) 21.6 ± 11.7 19.9 ± 8.9 16.3 ± 10.8 0.161 (0.007) 0.001 0.002
Lumbar
 Cobb (°) 44.3 ± 16.8 33.1 ± 15.0 35.2 ± 15.9 <0.001 <0.001 0.018
 Lordosis (°) 48.8 ± 12.0 45.4 ± 10.8 43.7 ± 12.4 0.006 <0.001 0.341 (0.620)a
 Vertebral rotation (°) 10.7 ± 12.8 7.5 ± 11.4 6.2 ± 13.7 0.428 (<0.001) 0.663 (0.129)a 0.679 (0.006)
  1. aAgreement according to the Bland-Altman plot