Table 2.

The association of BMI with proximal femoral QCT measurements stratified by obesity status in men of the MrOS study

	BMI < 30 (n=2397)		BMI>=30 (n=670)		P for Interaction *
	SD increase per unit of BMI	P	SD increase per unit of BMI	P
Femoral neck
BMD (g/cm3)
Integral	0.05 ± 0.008	<0.0001	−0.012 ± 0.014	0.39	0.0003
Cortical	0.042 ± 0.008	<0.0001	−0.008 ± 0.013	0.54	0.002
Trabecular	0.002 ± 0.0004	<0.0001	−0.0008 ± 0.0006	0.18	0.0005
Volume (cm3)
Integral	0.027 ± 0.008	0.001	−0.015 ± 0.014	0.28	0.014
Medullary	0.006 ± 0.009	0.47	−0.011 ± 0.014	0.45	0.33
Percent cortical volume	0.042 ± 0.008	<0.0001	−0.009 ± 0.013	0.49	0.002
Cross-sectional area (cm2)	0.03 ± 0.009	0.0005	−0.02 ± 0.014	0.14	0.003
DXA BMD	0.105 ± 0.008	< 0.0001	0.035 ± 0.014	0.011	<0.0001

P-value was adjusted for age, site, race and physical activity.

^*The interaction was to test the difference of point estimates between the non-obese and the obese.