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Table 2 Comparison between BMD and BSI reproducibility at different thicknesses

From: Bone strain index reproducibility and soft tissue thickness influence: a dual x-ray photon absorptiometry phantom study

 

BMD (Fast array)

 

BSI (Fast array)

 

Pork rind thickness

0 cm

1 cm

3 cm

6 cm

p value

0 cm

1 cm

3 cm

6 cm

p value

SD

0.004

0.003

0.005

0.005

n.s.

0.022

0.018

0.029

0.025

n.s.

CoV

0.4%

0.3%

0.5%

0.5%

 

1.0%

0.8%

1.3%

1.2%

 

LSC

1.0%

0.9%

1.3%

1.4%

 

2.8%

2.3%

3.7%

3.3%

 

Reproducibility

99.0%

99.1%

98.7%

98.6%

 

97.2%

97.7%

96.3%

96.7%

 
 

BMD (Array)

 

BSI (Array)

 

Pork rind thickness

0 cm

1 cm

3 cm

6 cm

 

0 cm

1 cm

3 cm

6 cm

 

SD

0.003

0.004

0.004

0.005

n.s.

0.019

0.023

0.017

0.023

n.s.

CoV

0.3%

0.4%

0.4%

0.5%

 

0.9%

1.1%

0.8%

1.1%

 

LSC

0.7%

1.2%

1.1%

1.3%

 

2.5%

3.0%

2.2%

3.0%

 

Reproducibility

99.3%

98.8%

98.9%

98.7%

 

97.5%

97.0%

97.8%

97.0%

 
 

BMD (HD)

 

BSI (HD)

 

Pork rind thickness

0 cm

1 cm

3 cm

6 cm

 

0 cm

1 cm

3 cm

6 cm

 

SD

0.002

0.003

0.004

0.006

< 0.001

0.013

0.012

0.022

0.029

< 0.001

CoV

0.2%

0.3%

0.4%

0.6%

 

0.6%

0.6%

1.1%

1.4%

 

LSC

0.6%

0.7%

1.1%

1.6%

 

1.8%

1.7%

3.0%

3.9%

 

Reproducibility

99.4%

99.3%

98.9%

98.4%

 

98.2%

98.3%

97.0%

96.1%

 
  1. BMD Bone mineral density, BSI Bone strain index, HD High definition, CoV Coefficient of variation, SD Standard deviation, LSCLeast significant change percentage, 0 cm Absence of interposed soft tissue, n.s. Not statistically significant