Table 2 Agreement analysis of 3D body shape predicted vs measured body composition

From: Prediction of total and regional body composition from 3D body shape

  

Fenland phase 1 (validation)

  

Fenland phase 2 (validation)

  

Smartphone Validation Study

     
  

DXA silhouette

  

DXA silhouette

  

DXA silhouette

  

4 phone photos

  
  

n = 2272

  

n = 6102

  

n = 119

  

n = 119

  
  

Bias (95%LoA)

RMSE

ra

Bias (95%LoA)

RMSE

ra

Bias (95%LoA)

RMSE

ra

Bias (95%LoA)

RMSE

ra

DXA

Total body fat mass (kg)

−0.09 (−4.9; 4.7)

2.45

0.96

-0.13 (-5; 4.8)

2.50

0.96

0.57 (-5; 6.2)

2.86

0.95

0.93 (-6.4; 8.3)

3.76

0.91

 

Percentage body fat (%)

−0.07 (−6.4; 6.2)

3.22

0.91

−0.24 (−6.7; 6.2)

3.28

0.91

1.13 (−7.2; 9.5)

4.26

0.90

1.62 (−9.2; 12.5)

5.54

0.84

 

Android fat mass (kg)

0 (−0.7; 0.8)

0.38

0.95

0.03 (−0.7; 0.8)

0.38

0.95

0.07 (−0.6; 0.8)

0.36

0.95

0.12 (−0.9; 1.1)

0.50

0.89

 

Gynoid fat mass (kg)

0.04 (−1; 1)

0.51

0.95

0.02 (−1; 1)

0.51

0.94

0.06 (−1.1; 1.2)

0.59

0.92

0.13 (−1.2; 1.3)

0.67

0.90

 

Visceral fat mass (kg)

−0.03 (−0.7; 0.6)

0.34

0.89

−0.04 (−0.8; 0.7)

0.37

0.90

−0.02 (−0.4; 0.4)

0.19

0.94

0.08 (−0.5; 0.7)

0.29

0.85

 

Abdominal SCAT mass (kg)b

0.05 (−0.5; 0.6)

0.30

0.90

0.09 (−0.5; 0.7)

0.31

0.86

0.07 (−0.7; 0.9)

0.42

0.89

0.03 (−0.9; 1.0)

0.49

0.86

 

Peripheral fat mass (kg)c

−0.06 (−2.7; 2.6)

1.36

0.94

−0.11 (−2.8; 2.6)

1.39

0.93

0.12 (−2.6; 2.9)

1.40

0.94

0.44 (−3.0; 3.9)

1.74

0.91

 

Total lean mass (kg)

0.11 (−4.7; 4.9)

2.45

0.97

0.32 (−4.7; 5.3)

2.54

0.97

−0.95 (−6.9; 5)

3.05

0.95

−1.51 (−9.0; 6.0)

3.82

0.93

 

Appendicular lean mass (kg)d

−0.01 (−2.8; 2.7)

1.40

0.97

0.41 (−2.3; 3.2)

1.40

0.97

−1.21 (−4.2; 1.8)

1.53

0.96

−1.25 (−5.3; 2.8)

2.05

0.93

 

ALMI (kg/m2)e

−0.01 (−0.9; 0.9)

0.48

0.93

0.14 (−0.8; 1.1)

0.48

0.93

−0.43 (−1.5; 0.6)

0.54

0.91

−0.42 (−1.8; 1.0)

0.70

0.84

BODPOD

Volume (L)

–

–

–

–

–

–

–

–

–

5.36 (−4.9; 15.6)

5.21

0.91

Anthropometry

Waist Circumference (cm)

–

–

–

–

–

–

–

–

–

2.49 (−7.4; 12.4)

5.04

0.89

 

Hip circumference (cm)

–

–

–

–

–

–

–

–

–

2.25 (−6.3; 10.8)

4.38

0.87

 

Calf circumference (cm)

–

–

–

–

–

–

–

–

–

4.09 (1.3; 6.7)

2.76

0.59

 

Arm circumference (cm)

–

–

–

–

–

–

–

–

–

−3.03 (−7.8; 1.7)

2.42

0.80

  1. ar = Pearson’s correlations.
  2. bSCAT = subcutaneous adipose tissue.
  3. cPeripheral fat mass = arms + legs fat mass.
  4. dAppendicular lean mass = arms + legs lean mass.
  5. eALMI: appendicular lean mass index = appendicular lean mass/height2.
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