Table 2.

Regression Coefficients (β) With 95% CIs and p Value, for Regression Between TBLH and Upper and Lower Limb BMC (g), Area (cm²), Areal BMD (mg/cm²), Area-Adjusted BMC (g), and Total MVPA, as Well as Age of DXA Scan, Sex, and Socio-Economic Factors

		Height				Height and lean mass				Height and lean and fat mass
		β	95% CI		p	β	95% CI		p	β	95% CI		p
TBLH	BMC	4.02	−0.50	8.53	0.08	−0.47	−4.10	3.16	0.8	14.92	11.80	18.05	<0.001
	Area	−1.98	−5.23	1.26	0.2	−5.04	−7.72	−2.37	<0.001	7.82	5.65	9.98	<0.001
	BMD	4.52	3.09	5.96	<0.001	3.26	2.04	4.48	<0.001	5.90	4.70	7.11	<0.001
	aBMC	6.46	4.88	8.04	<0.001	5.74	4.22	7.25	<0.001	5.30	3.75	6.86	<0.001
Upper Limb	BMC	0.55	−0.11	1.22	0.1	−0.13	−0.65	0.40	0.6	1.05	0.53	1.57	<0.001
	Area	0.18	−0.49	0.86	0.6	−0.47	−1.02	0.08	0.09	0.81	0.27	1.34	0.003
	BMD	1.86	0.74	2.99	0.001	0.94	−0.04	1.92	0.06	2.10	1.11	3.10	<0.001
	aBMC	0.39	0.16	0.62	<0.001	0.29	0.06	0.51	0.01	0.34	0.11	0.56	0.003
Lower Limb	BMC	3.53	1.39	5.67	0.001	1.39	−0.32	3.10	0.1	9.44	8.04	10.84	<0.001
	Area	−0.24	−1.41	0.92	0.7	−1.29	−2.27	−0.31	0.01	3.72	2.95	4.48	<0.001
	BMD	6.75	4.64	8.85	<0.001	5.01	3.18	6.84	<0.001	9.42	7.63	11.20	<0.001
	aBMC	3.90	2.76	5.05	<0.001	3.36	2.26	4.46	<0.001	3.74	2.62	4.87	<0.001

Analyses were adjusted for height, height and lean mass, and height and lean and fat mass (n = 4457). β reflects the change in DXA outcome per 100 cpm increase in activity level (height included both linear and quadratic terms).