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Table 1 Subject characteristics

From: Fat-free mass prediction equations for bioelectric impedance analysis compared to dual energy X-ray absorptiometry in obese adolescents: a validation study

 

Total (n = 103)

Girls (n = 61)

Boys (n = 42)

Mean (sd)

Mean (sd)

Mean (sd)

Age, y

14.4 (1.7)

14.7 (1.7)

14.1 (1.7)

Height, m

1.66 (0.09)

1.64 (0.06)

1.69 (0.12)

Weight, kg

94.3 (15.7)

94.3 (14.0)

94.2 (18.0)

Waist circumference, cm

109.0 (11.1)

108.4 (11.1)

109.7 (11.2)

BMI (kg/m2)

33.9 (4.1)

34.8 (4.2)

32.7 (3.5)

BMI SDS

2.98 (0.34)

2.94 (0.35)

3.05 (0.32)

Tanner stage, nb

Pre-pubertal (stage 1)

32

10

22

Pubertal (stage ≥ 2)

65

50

15

BIA

-Resistance, Ω

505.2 (54.1)

508.8 (49.2)

500.0 (60.7)

-Reactance, Ω

62.6 (7.7)

63.9 (7.7)

60.7 (7.5)

-Impedance, (Z)

509.1 (54.3)

512.8 (49.6)

503.7 (60.8)

-Fat-free mass, kga

57.8 (10.1)

55.9 (7.4)

60.4 (12.7)

DXA

-Fat-free mass, kg

56.1 (9.8)

54.7 (7.1)

58.1 (12.5)

  1. aFat-free mass is supplied by Hydra ECF/ICF Bio-Impedance Spectrum Analyzer
  2. bFor Tanner stage missing values were 1 for girls and 5 for boys