Table 1.

Characteristics of the population

		Males (n= 531)	Females (n=346)
Bone mineral density (g/cm2)
Baseline visit	Median (Quartiles)	0.63 (0.57, 0.69)	0.63 (0.58, 0.71)
Last followup visit	Median (Quartiles)	0.99 (0.90, 1.09)	1.02 (0.93, 1.13)
Age (yrs)
Baseline visit	Median (Quartiles)	8.8 (7.1, 10.6)	8.9 (7.3, 10.6)
Last followup visit	Median (Quartiles)	16.6 (15.1, 17.7)	16.6 (15.0, 17.7)
Race/ethnicity	% White/Other	75.5	78.3
	% Black	13.2	14.4
	% Hispanic	11.3	7.2
Tanner stage
Baseline visit	% Stage 1	71.3	70.5
	% Stage 2	22.6	17.0
	% Stage 3	4.4	8.1
	% Stage 4	1.7	3.5
	% Stage 5	0.0	0.9
Last followup visit	% Stage 1	5.6	2.6
	% Stage 2	4.3	4.3
	% Stage 3	7.3	10.1
	% Stage 4	17.1	20.2
	% Stage 5	65.6	62.8
Height (m)
Baseline visit	Median (Quartiles)	1.33 (1.23, 1.43)	1.32 (1.23, 1.43)
Last followup visit	Median (Quartiles)	1.74 (1.68, 1.79)	1.62 (1.58, 1.66)
Body mass index (kg/m2)
Baseline visit	Median (Quartiles)	17.2 (15.8, 19.9)	17.3 (15.7, 20.4)
Last followup visit	Median (Quartiles)	22.6 (20.3, 26.1)	22.7 (20.3, 26.6)
Body mass index for age (percentile)
Baseline visit	Median (Quartiles)	70.6 (44.0, 90.2)	70.5 (41.6, 89.7)
Last followup visit	Median (Quartiles)	72.6 (46.2, 90.7)	74.1 (51.2, 90.9)