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Table 2 Correlation coefficients between skeletal muscle volume (SMV), electrical properties, muscle thickness index, and physical characteristics

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

Variable Thigh SMV (cm3) Quadriceps SMV (cm3) 50-kHz BI index (cm2/Ω) ICW index (cm2/Ω) ECW/ICW index (a.u) Phase angle (degree) Muscle thickness index (cm3) Age (years) Height (cm) Body weight (kg)
Thigh SMV (cm3) - 0.951** 0.740** 0.839* −0.600* 0.571* 0.771** −0.178 0.121 0.540*
Quadriceps SMV (cm3)   - 0.658** 0.743** −0.532** 0.484* 0.737** −0.109 0.117 0.555*
50-kHz BI index (cm2/Ω)    - 0.878* −0.308 0.288 0.556** −0.234 0.275 0.323
ICW index (cm2/Ω)     - −0.712** 0.695** 0.627** −0.298 0.095 0.332
ECW/ICW index (a.u)      - −0.959** −0.455 0.251 0.217 −0.281
Phase angle (degree)       - 0.506* −0.224 −0.211 0.220
Muscle thickness index (cm3)        - −0.109 0.332 0.646*
Age (years)         - 0.135 0.278
Height (cm)          - 0.392
Body weight (kg)           
  1. SMV skeletal muscle volume, BI bioelectrical impedance, ICW intracellular water, ECW/ICW extracellular water per intracellular water
  2. *p < 0.05
  3. **p < 0.01