Table 5 Agreement between BIA and DXA, stratified by age and gender

Age category

18-34 years

Appendicular lean mass/height square (kg/m²)

0.0085 (−0.29-0.30)

−0.43 (−0.66- -0.14)

Lean mass left arm (kg)

0.92 (085–0.95)

0.45 (0.16-0.67)

Lean mass right arm (kg)

0.89 (0.80-0.94)

0.58 (0.32-0.75)

Lean mass trunk (kg)

0.91 (0.84-0.95)

0.44 (0.15-0.67)

Lean mass left leg (kg)

0.089 (−0.22-0.38)

−0.14 (−0.44-0.18)

Lean mass right leg (kg)

0.086 (−0.22-0.37)

−0.13 (−0.43-0.19)

Fat mass (kg)

−0.038 (−0.33-0.26)

−0.086 (−0.39-0.23)

Body fat (%)

−0.25 (−0.43-0.15)

−0.44 (−0.66-0.15)

35-64 years

Appendicular lean mass/height square (kg/m²)

−0.11 (−0.38-0.18)

−0.038 (−0.031-0.24)

Lean mass left arm (kg)

0.81 (0.68-0.89)

0.37 (0.11-0.59)

Lean mass right arm (kg)

0.40 (0.13-0.61)

0.65 (0.46-0.79)

Lean mass trunk (kg)

0.42 (0.15-0.63)

0.70 (0.53-0.82)

Lean mass left leg (kg)

−0.0019 (−0.29-0.28)

−0.0046 (−0.29-0.28)

Lean mass right leg (kg)

0.050 (−0.24-0.33)

−0.045 (−0.32-0.24)

Fat mass (kg)

0.17 (−0.12-0.44)

0.19(−0.098-0.44)

Body fat (%)

−0.23 (−0.49-0.057)

−0.19 (−0.45-0.093)

65+ years

Appendicular lean mass/height square (kg/m²)

0.32 (−0.12-0.66)

−0.23 (−0.54-0.13)

Lean mass left arm (kg)

0.92 (0.80-0.96)

0.64 (0.37-0.81)

Lean mass right arm (kg)

0.61 (0.25-0.82)

0.85 (0.71-0.92)

Lean mass trunk (kg)

0.63 (0.28-0.83)

0.60 (0.29-0.77)

Lean mass left leg (kg)

0.24 (−0.21-0.61)

−0.078(−0.42-0.28)

Lean mass right leg (kg)

0.33 (−0.12-0.68)

−0.18(−0.50-0.18)

Fat mass (kg)

0.24 (−0.21-0.60)

0.72 (0.49-0.85)

Body fat (%)

−0.14 (−0.53-0.31)

0.42 (0.08-0.67)