A PRISMA-Driven Systematic Review of Predictive Equations for Assessing Fat and Fat-Free Mass in Healthy Children and Adolescents Using Multicomponent Molecular Models as the Reference Method
Table 2
Median values for hydration, density, and constants ( and ) for the paediatric version of Siri’s (11) equation, obtained by using the LMS (lambda-mu-sigma) method*.
Age
Males
Females
Hydration %
Density kg/L
Hydration %
Density kg/L
5 y
76.5
1.0827
5.36
4.95
76.7
1.0837
5.33
4.92
6 y
76.3
1.0844
5.32
4.90
76.1
1.0865
5.27
4.85
7 y
76.1
1.0861
5.28
4.86
75.5
1.0887
5.22
4.79
8 y
75.9
1.0877
5.24
4.82
75.2
1.0900
5.19
4.76
9 y
75.7
1.0889
5.21
4.79
75.1
1.0909
5.17
4.74
10 y
75.5
1.0900
5.19
4.76
75.0
1.0916
5.15
4.72
11 y
75.3
1.0911
5.16
4.73
75.0
1.0924
5.13
4.70
12 y
75.2
1.0917
5.15
4.72
74.9
1.0937
5.10
4.67
13 y
75.0
1.0920
5.14
4.71
74.6
1.0954
5.07
4.63
14 y
74.8
1.0927
5.13
4.69
74.4
1.0975
5.02
4.58
15 y
74.4
1.0942
5.09
4.66
74.1
1.0996
4.98
4.53
16 y
74.0
1.0960
5.05
4.61
73.8
1.1011
4.95
4.49
17 y
73.7
1.0978
5.02
4.57
73.7
1.1020
4.93
4.47
18 y
73.5
1.0991
4.99
4.54
73.6
1.1027
4.92
4.46
19 y
73.4
1.1000
4.97
4.52
73.6
1.1031
4.91
4.45
20 y
73.3
1.1006
4.96
4.51
73.6
1.1035
4.90
4.44
*C1 is calculated as ( * )/(), and is calculated as DFFM /(); and represent fat-free mass density and fat mass density, respectively. % fat mass is calculated as [(/Db) – ] * 100, where Db is measured body density. Adapted from Wells et al. [33].