Table 2

Mean lean body mass values (LBM), bone mineral content of total body (BMCTB), and percentage body fat (% fat), with standard deviations (SD) in boys and girls.

LBM (g)BMCTB (g)Ln(% fat)*
Age (y)MeanSDMeanSDMeanSD
*Because of a skewed distribution, a logarithmic transformation for percentage body fat (% fat) was performed. We showed natural logarithm (ln) of the data.
Calculating standard deviation scores (SDS): for boys: % fat SDS = (ln(%fat) − ln(%fat mean))/ln(%fat SD); for girls: % fat SDS = (ln(%fat+10) − ln(%fat mean))/ln(%fat SD). For the other parameters SDS = (measured value − mean)/SD.
Boys
4–4.9158852351708692.350.53
5–5.9180922636839992.350.53
6–6.92046729219651292.350.53
7–7.922985320710841592.350.53
8–8.925616349211971902.350.53
9–9.928324377713102202.350.53
10–10.931065406214382502.350.53
11–11.933802434715992802.350.53
12–12.936586463318133102.350.53
13–13.940687491820873402.350.53
14–14.949492520324063702.350.53
15–15.955472548827254002.350.53
16–16.957983577329974302.350.53
17–17.959943605932004602.350.53
18–18.961690634433364902.350.53
19–19.963249662934195212.350.53
20–20.964628691434695512.350.53
21–21.965836719934985812.350.53
22–22.966937749935156122.350.53
Girls
4–4.91546823177141123.220.24
5–5.91743424998321343.240.24
6–6.91945226829391563.260.24
7–7.921535286510391793.280.24
8–8.923762304711472013.290.24
9–9.926297323012752233.310.24
10–10.929323341214382463.330.24
11–11.932759359516402683.350.24
12–12.936070377818712903.370.24
13–13.938692396021043133.390.24
14–14.940512414323133353.410.24
15–15.941736432524773573.420.24
16–16.942588450825953793.440.24
17–17.943213469026734023.460.24
18–18.943692487327234243.480.24
19–19.944069505627534463.500.24
20–20.944370523827724693.520.24
21–21.944611542127834913.530.24
22–22.944815561227905143.550.24