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Table 2 Summary of regression and Bland-Altman analysis before and after weight-loss compared to DXA

From: Validity of air-displacement plethysmography in the assessment of body composition changes in a 16-month weight loss program

 

Regression

Bland-Altman

 

Intercept

Slope

R2

SEE

Bias

95% Limits

p Value

Before weight-loss

ADP %fat

6.6671

0.937

0.845

2.056

-4.0123

0.128 to 8.152

0.648

After weight-loss (16 months)

ADP %fat

4.9561

0.969

0.884

2.183

-3.7603

0.600 to 8.120

0.408

Δ (before – after weight-loss)

ADP %fat

-0.6181

0.902

0.763

2.182

0.252

-4.168 to 4.672

0.665

  1. 1 Significantly different from 0 (p ≤ 0.05).
  2. 2 Significantly different from 1 (p ≤ 0.001).
  3. 3 Bland-Altman analysis bias is the mean difference between ADP and DXA (p ≤ 0.001) with the trend between DXA and ADP not significant at any time point (i.e. no bias between techniques was observed).
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