Table 2  Predictive performance of optimized models across age groups.

From: Bioelectrical impedance analysis of bone mineral content based on dual-energy X-ray absorptiometry: evaluation of age-stratified optimized models

Group

Optimization equation

Adjusted R2

RMSD

6–17 (n = 50)

Y = X−X1×FFM + X2×LL-HFI + X3×Age− X4×Height

0.90

0.287

18–35 (n = 178)

Y = X + X1×Mineral + X2×FM

0.79

0.232

36–50 (n = 33)

Y = X−X1×Mineral

0.80

0.165

51–86 (n = 41)

Y = X + X1×ECW_RL val−X2×ECW_LL val + X3×TBW in RA

0.73

0.218

6–86 (n = 302)

Y = X + X1×Mineral + X2×LL-HFI + X3×RL-MFI + X4×FM

0.87

0.295

  1. RMSD, Root-mean-square deviation. ECW RL val, Extracellular Water Right leg value. ECW LL val, Extracellular Water Left Leg Value. TBW in RA, Total Body Water Right Arm Value. LL-HFI, Left Leg High-Frequency Impedance. RL-MFI, Right Leg Medium-Frequency Impedance.
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