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Table 3 Coefficients of multiple linear regression analysis for estimating thigh and quadriceps skeletal muscle volume (SMV)

From: Estimating thigh skeletal muscle volume using multi-frequency segmental-bioelectrical impedance analysis

 

Thigh SMV (cm3)

 

Quadriceps SMV (cm3)

 

Non-standardised (B)

Standardised (β)

p value

 

Non-standardised (B)

Standardised (β)

p value

Model 1

R2 = 0.701, SEE = 201.2 cm3 (7.9%)

Model 1

R2 = 0.552, SEE = 182.5 cm3 (9.9%)

Constant

2180.6

 

0.009

Constant

1595.5

 

0.027

50-kHz BI index (cm2/Ω)

45.4

0.614

0.001

50-kHz BI index (cm2/Ω)

29.9

0.546

0.012

ECW/ICW index (a.u)

−581.2

−0.411

0.018

ECW/ICW index (a.u)

−380.8

−0.363

0.074

Model 2

R2 = 0.689, SEE = 205.4 cm3 (8.1%)

Model 2

R2 = 0.528, SEE = 188.5 cm3 (10.3%)

Constant

-673.7

 

0.309

Constant

−217.9

 

0.714

50-kHz BI index (cm2/Ω)

46.4

0.627

0.001

50-kHz BI index (cm2/Ω)

31.0

0.565

0.011

Phase angle (degree)

167.5

0.391

0.025

Phase angle (degree)

102.2

0.322

0.115

Model 3

R2 = 0.703, SEE = 200.5 cm3 (7.9%)

Model 3

R2 = 0.551, SEE = 182.8 cm3 (9.9%)

Constant

951.7

 

0.341

Constant

796.6

 

0.381

ICW index (cm2/Ω)

119.0

0.835

0.001

ICW index (cm2/Ω)

78.0

0.739

0.012

ECW/ICW index (a.u)

−7.7

-0.005

0.979

ECW/ICW index (a.u)

−5.4

−0.005

0.984

Model 4

R2 = 0.704, SEE = 200.4 cm3 (7.9%)

Model 4

R2 = 0.553, SEE = 182.4 cm3 (9.9%)

Constant

989.8

 

0.125

Constant

900.2

 

0.125

ICW index (cm2/Ω)

121.8

0.855

0.001

ICW index (cm2/Ω)

82.9

0.785

0.007

Phase angle (degree)

−10.1

−0.024

0.909

Phase angle (degree)

−19.6

−0.061

0.808

  1. SMV skeletal muscle volume, BI bioelectrical impedance, ICW intracellular water, ECW/ICW extracellular water per intracellular water, SEE standard error of the estimate