Table 2. Bone indices.

Mid calcaneal ROI	Case (n = 219)		Control (n = 100)
	mean	sd	mean	sd
Trabecular density (mg HA/cm3)	163	41	165	44
Bone volume fraction (BV/TV)	0.14	0.03	0.14	0.04
Trabecular number (/mm)	3.95	0.20	3.93	0.20
Trabecular separation (mm)	0.219	0.017	0.220	0.017
Trabecular thickness (mm)	0.034	0.008	0.035	0.009
Plantar ROI	Case (n = 219)		Control (n = 100)
	mean	sd	mean	sd
Trabecular density (mg HA/cm3)	356	37	345	47
Bone volume fraction (BV/TV)	0.30	0.03	0.29	0.04
Trabecular number (/mm)	3.95	0.15	3.92	0.16
Trabecular separation (mm)	0.178	0.012	0.182	0.015
Trabecular thickness (mm)	0.075	0.008	0.073	0.009
Cortical density (mg HA/cm3)	641	69	647	79
Mean cortical thickness (mm)	0.846	0.41	0.897	0.55
Mean cortical area (mm2)	57.9	29.5	57.6	36.1

Bold denotes p for case-control comparison <0.05, t-test for continuous data.

ROI region of interest, sd standard deviation.