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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.