Table 4.

HRpQCT parameter values (mean ± SD) and hierarchical linear regression results.

Parameter	Mean	SD	Predictors	R2	ΔR2	p	Beta
Total BMD (mgHA/cm3)	298.23	51.53	Age, height	0.064		0.101
			+Body mass	0.067	0.003	0.640	0.068
			+Grip strength	0.088	0.024	0.184	−0.175
			+Adolescent loading	0.068	0.004	0.584	−0.065
			+Adult loading	0.076	0.012	0.360	0.110
Trabecular BMD (mgHA/cm3)	162.86	30.03	Age, height	0.096		0.031
			+Body mass	0.110	0.014	0.309	0.146
			+Grip strength	0.122	0.026	0.164	0.181
			+Adolescent loading	0.101	0.005	0.525	0.074
			+Adult loading	0.167	0.071	0.019	0.272
Cortical BMD (mgHA/cm3)	969.24	44.06	Age, height	0.119		0.013
			+Body mass	0.147	0.028	0.142	0.207
			+Grip strength	0.289	0.170	<0.001	−0.464
			+Adolescent loading	0.120	0.001	0.749	−0.037
			+Adult loading	0.139	0.020	0.215	−0.144
Total area (mm2)	274.23	49.23	Age, height	0.316		<0.001
			+Body mass	0.321	0.005	0.493	0.086
			+Grip strength	0.494	0.179	<0.001	0.477
			+Adolescent loading	0.316	<0.001	0.945	−0.007
			+Adult loading	0.325	0.009	0.354	0.095
Trabecular number (1/mm)	2.00	0.26	Age, height	0.174		0.001
			+Body mass	0.249	0.076	0.011	0.342
			+Grip strength	0.178	0.004	0.564	0.072
			+Adolescent loading	0.195	0.022	0.179	0.148
			+Adult loading	0.198	0.024	0.158	0.158
Cortical thickness (mm)	0.77	0.15	Age, height	0.047		0.189
			+Body mass	0.049	0.002	0.738	0.049
			+Grip strength	0.060	0.013	0.337	−0.128
			+Adolescent loading	0.072	0.025	0.178	−0.159
			+Adult loading	0.048	0.001	0.846	0.024
Cortical porosity (%)	1.20	0.67	Age, height	0.050		0.169
			+Body mass	0.091	0.041	0.084	−0.252
			+Grip strength	0.106	0.056	0.043	0.267
			+Adolescent Loading	0.050	<0.001	0.946	0.008
			+Adult loading	0.133	0.083	0.013	0.294

R² Total variance explained by the model, ΔR² Additional variance explained by predictor, p significance of F-value change,

Beta Standardized coefficient.

Bold font indicates those variables that significantly contribute to the regression.