Table 4.

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 Light, Moderate, and Vigorous Activity

		Light activity				Moderate activity				Vigorous activity
		β	95% CI		p	β	95% CI		p	β	95% CI		p
TBLH	BMC	3.89	−0.11	7.89	0.06	18.83	13.30	24.36	<0.001	6.59	0.58	12.60	0.03
	Area	2.47	−0.30	5.24	0.08	8.73	4.90	12.56	<0.001	4.59	0.42	8.75	0.03
	BMD	1.69	0.15	3.23	0.03	7.48	5.36	9.61	<0.001	2.44	0.13	4.75	0.04
	aBMC	0.85	−1.14	2.84	0.4	8.09	5.33	10.84	<0.001	0.94	−2.05	3.94	0.5
Upper limb	BMC	1.15	0.49	1.81	<0.001	0.11	−0.80	1.02	0.8	1.34	0.35	2.34	0.008
	Area	1.02	0.34	1.71	0.003	−0.06	−1.01	0.88	0.9	1.12	0.09	2.15	0.03
	BMD	2.20	0.92	3.47	<0.001	0.17	−1.59	1.93	0.9	2.83	0.92	4.75	0.004
	aBMC	0.25	−0.04	0.54	0.09	0.17	−0.23	0.57	0.4	0.36	−0.08	0.79	0.1
Lower limb	BMC	2.94	1.15	4.73	0.001	13.07	10.60	15.53	<0.001	2.25	−0.43	4.94	0.1
	Area	1.43	0.46	2.41	0.004	5.07	3.72	6.41	<0.001	0.76	−0.70	2.23	0.3
	BMD	2.81	0.52	5.09	0.02	12.61	9.46	15.77	<0.001	2.91	−0.52	6.34	0.1
	aBMC	0.74	−0.70	2.19	0.3	5.30	3.30	7.30	<0.001	1.08	−1.08	3.25	0.3

Analyses were adjusted for age of DXA scan, sex, socio-economic factors, height, lean mass, and fat mass (n = 4457). β reflects the change in DXA outcome per 100 cpm increase in activity levels, after multiple regression analysis in which all three activity terms were included simultaneously (height included both linear and quadratic terms).