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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