Table 2.

Participant descriptives, Means (SD)

	Males (n = 1944)	Females (n = 3229)
Age (years)	13.3 (2.6)	12.58 (2.6)
Height (cm)	155.4 (11.5)	155.1 (15.5)
Weight (kg)	48.5 (13.0)	48.2 (16.0)
Whole body BMC (g)	1686.9 (511.2)	1689.9 (675.1)
Total proximal femur BMC (g)	25.9 (8.6)	29.2 (12.4)
Femoral neck BMC (g)	3.7 (1.0)	4.1 (1.2)
Lumbar spine BMC (g)	42.7 (14.7)	41.4 (19.2)
Ethnicity (W/A/H/B) (%)	25/8/2/2	50/8/2/3

Key: BMC – Bone mineral content; n = number of observation. W – White; A – Asian; H – Hispanic; B – Black.