Validity of Four Commercial Bioelectrical Impedance Scales in Measuring Body Fat among Chinese Children and Adolescents
Table 1
Physical characteristics and body compositions of the study population.
Boys ()
Girls ()
Mean (SD)
Range
Mean (SD)
Range
Lower
Upper
Lower
Upper
Age (years)
13.8 (2.9)
9.0
19.5
13.7 (2.8)
9.0
19.4
Height (cm)
161.8 (14.0)
130.5
186.0
154.3 (9.8)
126.6
172.0
Weight (kg)
55.9 (17.0)
27.5
108.1
47.4 (11.3)
23.5
97.1
BMI (kg2/m)
21.0 (4.2)
13.6
37.1
19.7 (3.2)
13.3
34.8
LTM-DXA (kg)
41.0 (11.2)
21.0
65.3
31.0 (5.5)
18.7
54.3
BMC-DXA (kg)
2.0 (0.7)
0.9
3.8
1.7 (0.5)
0.8
2.7
FM-DXA (kg)
12.7 (9.5)
3.3
53.1
14.3 (6.8)
2.7
40.6
FFM-DXA (kg)
43.0 (11.8)
22.1
69.0
32.8 (5.9)
19.5
56.8
FFM-Model A (kg)
43.8 (12.7)
21.8
77.4
33.9 (6.5)
18.6
61.2
FFM-Model B (kg)
43.2 (11.7)
20.8
73.2
34.7 (5.5)
20.6
51.7
FFM-Model C (kg)
44.5 (12.0)
22.6
73.2
34.5 (5.5)
20.6
51.6
FFM-Model D (kg)
44.3 (12.2)
22.8
72.0
34.0 (5.9)
20.0
55.3
%BF-DXA (%)
20.8 (9.9)
6.1
49.1
27.9 (7.7)
11.8
46.5
%BF-Model A (%)
21.4 (7.0)
4.9
39.6
27.4 (6.0)
13.6
42.1
%BF-Model B (%)
21.9 (6.9)
10.1
45.3
25.3 (7.8)
9.3
49.4
%BF-Model C (%)
19.0 (9.0)
5.0
54.7
25.8 (7.7)
10.3
47.6
%BF-Model D (%)
20.2 (8.5)
6.2
47.3
26.3 (8.1)
6.4
44.8
Note: data are presented as mean (SD); BMI: body mass index; LTM-DXA: lean tissue mass measured by dual-energy X-ray absorptiometry; BMC-DXA: bone mineral content measured by dual-energy X-ray absorptiometry; FM-DXA: fat mass measured by dual-energy X-ray absorptiometry; %BF-DXA: body fat percentage measured by dual-energy X-ray absorptiometry; FFM-DXA: fat-free mass calculated as the sum of LTM and BMC; Model A: Biodynamics-310; Model B: Tanita TBF 543; Model C: Tanita BC-545; Model D: InBody 520.
