Table 1 Basic characteristics of the Caucasian study population for generation of BIA equations and of the multiethnic study population used to cross-validate these equations

From: Quantification of whole-body and segmental skeletal muscle mass using phase-sensitive 8-electrode medical bioelectrical impedance devices

 

Female, n=66

Male, n=70

All, n=136

Equation generation population

 Age (years)

40.5±12.8

39.6±12.0

40.0±12.3

 BMI (kg/m2)

23.9±3.5

26.0±3.3***

25.0±3.5

 Waist circumference (cm)

82.0±10.8

92.4±10.1***

87.3±11.6

 Ht2/R50 (cm2/Ω)

48.2±6.3

70.3±8.5***

59.6±13.4

 R50 (Ω)

588±50

468±50***

526±78

 Xc50 (Ω)

60.0±6.6

56.7±7.0**

58.3±7.0

 Index R50

0.0907±0.0082

0.1040±0.0095***

0.0975±0.0111

 Index Xc50

0.1056±0.0095

0.1240±0.0101***

0.1151±0.0135

Cross-validation population

 Age (years)

39.9±12.5

40.4±13.2

40.2±12.8

 BMI (kg/m2)

25.0±3.8

25.8±4.2

25.4±4.0

 Waist circumference (cm)

83.1±11.2

90.1±12.7**

86.6±12.4

 Ht2/R50 (cm2/Ω)

44.6±5.3

62.7±9.2***

53.6±11.8

 R50 (Ω)

595±60

492±60***

544±79

 Xc50 (Ω)

62.7±7.2

58.5±8.5**

60.6±8.1

 Index R50

0.0955±0.0129

0.1051±0.0124***

0.1003±0.0135

 Index Xc50

0.0971±0.0125

0.1194±0.0111***

0.1082±0.0163

  1. Abbreviations: BMI, body mass index; Ht, height.
  2. *P<0.05, **P<0.01, ***P<0.001 sex difference by t-test. Impedance raw data were obtained in the supine position with eight electrodes and averaged for the left and right side of the body.
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