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Table 1 Mean DXA and QCT results at baseline and at follow-up.

From: Baseline new bone formation does not predict bone loss in ankylosing spondylitis as assessed by quantitative computed tomography (QCT) - 10-year follow-up

  baseline   follow-up   change p
  absolute T-score absolute T-score   
QCT L1-L5, mean (mg/cm3) 94.2 -3.654 76.1 -4.468 18.0 0.001*
(SD) 31.8 1.246 33.5 1.499   
median (25th-75th percentile) 96.5 (68.2-122.5)   77.5 (47.0-113.7)    
DXA L2--L4, mean (g/cm2) 1.027 -1.780 1.180 -0.493 -0.15 0.0009*
(SD) 0.183 1.531 0.198 1.649   
median (25th-75th percentile) 0.96 (0.86-1.24)   1.19 (1.0-1.35)    
DXA neck, mean (g/cm2) 0.892 -1.131 0.926 -1.108 -0.03 0.48
(SD) 0.134 1.077 0.279 2.139   
median (25th-75th percentile) 0.86 (0.83-0.92)   0.88 (0.83-0.96)    
DXA Wards, mean (g/cm2) 0.737 -1.715 0.727 -1.792 0.01 0.81
(SD) 0.129 0.992 0.231 1.776   
median (25th-75th percentile) 0.73 (0.65-0.82)   0.69 (0.62-0.79)    
  1. DXA, dual-energy x-ray absorptiometry; QCT, quantitative computed tomography.