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Table 3 Coefficients, precision, and validation of a multicomponent anthropometric model to estimate body composition in older adults

From: Multicompartment body composition analysis in older adults: a cross-sectional study

 

Appendicular lean soft tissue

Fat mass

Bone mineral content

VIF

F

p (Pillai's trace)

Coefficients

 Intercept

-10.21376

17.85412

-1.21230

   

 Weight

0.19336

0.50239

0.01912

2.045

676.33

< 0.001

 Half-arm span

0.20139

-0.40498

0.02944

2.049

9.53

< 0.001

 Triceps skinfold

-0.04796

0.17292

-0.01267

2.544

4.17

0.008

 Sex

-3.16675

4.73524

-0.13021

2.407

11.33

< 0.001

Precision

 R2

0.85

0.83

0.62

   

 R2adjusted

0.85

0.83

0.61

   

 SEE (kg)

1.65

3.16

0.30

   

Cross-validation

 PRESS

287.00

1066.84

9.75

   

 Q2PRESS

0.84

0.81

0.58

   

 SPRESS (kg)

0.18

0.34

0.03

   
  1. Measurement protocol
  2. Weight was measured with the subject should stand still over the center of the platform with the body weight distributed between both feet, when the subject could use light indoor clothing, excluding shoes, long trousers, and sweaters
  3. Half-arm span was measured with the subject standing and the feet together and with their back (for women) or chest (for men) against the wall. The arms were outstretched laterally and maximally at the level of the shoulders in contact with the wall, and with the hands flat and fingers outstretched. The tip of the middle (longest) finger (excluding the fingernail) of the right hand was kept in contact with the block, while the zero ends of the tape were set at the tip of the middle (longest) finger (excluding the fingernail) of the left hand
  4. The triceps skinfold was measured in the midline of the posterior aspect of the arm, over the triceps muscle, at the point midway between the lateral projection of the acromion process of the scapula and the inferior margin of the olecranon process of the ulna. The level of measurement was determined by the distance between the lateral projection of the acromial process and the inferior border of the olecranon process of the ulna, determined with a tape measure. The subject was measured standing and the skinfold was measured with the arm hanging loosely. The triceps skinfold was picked up with the left thumb and index finger, and the tips of the calibers were applied to the skinfold at the marked level, approximately 1 cm proximal to the marked level
  5. Sex: male = 0; female = 1
  6. R2: coefficient of determination; R2adjusted: adjusted coefficient of determination; SEE: standard error to estimate; PRESS: sum of squares of residuals; Q2PRESS: press coefficient of determination; SPRESS: press standard error of estimate; VIF: variance inflation factor
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BMC Geriatrics

ISSN: 1471-2318

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