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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