Table 4. Association of Bone Parameters With Body Composition Adjusted for Age, Sex, Stage of Puberty, and Level of 25-Hydroxy Vitamin D in boys ^a.

	Lumbar Spine BMC	Lumbar Spine BMD	Lumbar Spine BMAD	Femoral Neck BMC	Femoral Neck BMD	Femoral Neck BMAD	Total Body BMC	Total Body BMD
R Square	0.73	0.73	0.32	0.71	0.55	0.10	0.89	0.77
Age, y	1.20 ± 0.49 b (0.18)	0.015 ± 0.005 b (0.23)	0.005 ± 0.002 b (0.38)	0.003 ± 0.029 (0.008)	0.002 ± 0.005 (0.04)	0.001 ± 0.001 (0.09)	35.62 ± 9.50 c (0.18)	0.012 ± 0.003 c (0.26)
T1	-4.31 ± 3.07 (0.13)	-0.05 ± 0.03 (0.15)	-0.002 ± 0.010 (0.03)	-0.24 ± 0.18 (0.13)	-0.019 ± 0.032 (0.07)	0.003 ± 0.008 (0.06)	-17.8 ± 59.1 (0.01)	-0.005 ± 0.020 (0.02)
T2	-6.64 ± 1.86 c (0.20)	-0.04 ± 0.01 b (0.14)	-0.005 ± 0.006 (0.07)	-0.21 ± 0.10 b (0.11)	-0.007 ± 0.019 (0.02)	0.005 ± 0.005 (0.10)	-43.0 ± 33.8 (0.04)	-0.005 ± 0.011 (0.02)
25 (OH) Vit. D, ng/mL	-0.06 ± 0.10 (0.02)	0.0 (0.01)	0.0 (0.04)	-0.003 ± 0.006 (0.02)	-0.001 ± 0.001 (0.03)	0.0 (0.05)	-2.25 ± 1.97 (0.02)	0.0 (0.01)
TBFM, Kg	-0.21 ± 0.15 (0.06)	0.0 (0.009)	0.001 ± 0.001 (0.08)	-0.006 ± 0.009 (0.02)	0.001 ± 0.002 (0.02)	0.0 (0.09)	4.96 ± 3.05 (0.04)	0.001 ± 0.001 (0.02)
Total lean mass, Kg	0.95 ± 0.11 c (0.66)	0.008 ± 0.001 c (0.57)	0.0 (0.16)	0.064 ± 0.007 c (0.78)	0.007 ± 0.001 c (0.64)	0.0 (0.18)	33.03 ± 2.13 c (0.76)	0.006 ± 0.001 c (0.62)

^a Data are expressed as B ± SE (standardized coefficient) in 9 - 18 years old Iranian male children and adolescents, (reference group for puberty is Tanner stage V, T1: Tanner stage I, II; T2: Tanner stage III, IV).

^b P < 0.05.

^c P < 0.001.