Fig. 2

Simple linear regression for estimating thigh skeletal muscle volume (SMV) measured by magnetic resonance imaging (MRI) with 50-kHz bioelectrical impedance index (BI) (A) and intracellular water (ICW) index (B). A y = 54.8 × 50 kHz BI index + 578.3; R² = 0.548; SEE = 239.0 cm³, 9.4%. B y = 119.5 × ICW index + 927.5; R² = 0.703; SEE = 193.7 cm³, 7.6%