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Table 1 Characterisitics of the participants for eqation development and cross-validation

From: Two-megahertz impedance index prediction equation for appendicular lean mass in Korean older people

  Development Group Cross-validation Group
  Men (n = 63) Women (n = 68) Men (n = 31) Women (n = 33)
Age (years) 77.5 ± 4.1 76.9 ± 4.4 76.5 ± 4.4 76.9 ± 3.7
Height (cm) 166 ± 5.0 153 ± 4.5* 168 ± 4.5 153 ± 5.0*
Weight (kg) 65.0 ± 7.5 55.3 ± 6.5* 67.2 ± 7.0 55.8 ± 5.5*
BMI (kg/m2) 23.5 ± 2.4 23.6 ± 2.5 23.7 ± 2.4 23.8 ± 2.1
FFM (kg) 49.8 ± 4.3 37.2 ± 3.4* 51.6 ± 4.2 37.8 ± 3.5*
FM (kg) 15.2 ± 5.8 18.1 ± 4.7* 15.6 ± 4.3 17.9 ± 3.5*
PBF (%) 22.9 ± 6.9 32.4 ± 5.4* 22.8 ± 5.0 32.0 ± 4.3*
ALM (kg) 20.4 ± 2.2 14.3 ± 1.6* 21.3 ± 2.1 14.4 ± 1.4*
Xc@5 kHz 13.6 ± 4.1 12.5 ± 3.4 13.8 ± 3.3 14.0 ± 3.2
Xc@50 kHz 38.0 ± 6.6 37.8 ± 5.7 37.4 ± 4.5 39.8 ± 5.4
Xc@250 kHz 28.6 ± 3.8 30.5 ± 3.4* 27.7 ± 2.5 31.6 ± 3.3*
R@5 kHz 563 ± 57 656 ± 66* 553 ± 49 657 ± 46*
R@50 kHz 502 ± 50 595 ± 60* 493 ± 46 594 ± 42*
R@250 kHz 453 ± 45 543 ± 55* 445 ± 42 539 ± 38*
ZI@1 kHz 48.6 ± 6.0 35.4 ± 4.1* 50.4 ± 5.4 35.0 ± 3.9*
ZI@5 kHz 49.6 ± 6.1 36.1 ± 4.1* 51.5 ± 5.5 35.8 ± 3.9*
ZI@50 kHz 55.4 ± 6.6 39.7 ± 4.6* 57.8 ± 6.3 39.6 ± 4.3*
RI@50 kHz 55.4 ± 6.8 39.5 ± 4.6* 57.7 ± 6.4 40.0 ± 4.4*
ZI@250 kHz 61.4 ± 7.2 43.6 ± 5.1* 64.0 ± 7.0 43.6 ± 4.7*
RI@250 kHz 61.3 ± 7.5 43.4 ± 5.1* 63.9 ± 7.1 43.8 ± 4.8*
ZI@500 kHz 63.5 ± 7.5 45.0 ± 5.2* 66.2 ± 7.2 45.0 ± 4.8*
ZI@1 MHz 65.4 ± 7.7 46.3 ± 5.4* 68.1 ± 7.4 46.3 ± 5.0*
ZI@2 MHz 67.3 ± 7.9 47.6 ± 5.6* 70.1 ± 7.7 47.7 ± 5.1*
ZI@3 MHz 68.7 ± 8.1 48.6 ± 5.7* 71.6 ± 7.9 48.7 ± 5.2*
  1. BMI Body bass index, FFM Fat-free mass, FM Body fat mass, PBF Percent body fat; Xc@xkHz: reactance at 5 kHz, 50 kHz and at 50 kHz; R@xkHz: resistance at 5 kHz, 50 kHz, and 250 kHz; ZI@xkHz: impedance index at 1 kHz, 5 kHz, 50 kHz, 250 kHz, 500 kHz, 1 MHz, 2 MHz and 3 MHz; RI@xkHz: resistance index at 50 kHz, 250 kHz; * = significantly different from women at p < 0.05; † = significantly differenct from development group at p < 0.05