TABLE 1

Characteristics of the Population

CharacteristicBoys (n = 531)Girls (n = 346)
BMD, median (quartiles), g/cm2
    Baseline visit0.63 (0.57, 0.69)0.63 (0.58, 0.71)
    Last follow-up visit0.99 (0.90, 1.09)1.02 (0.93, 1.13)
Age, median (quartiles), y
    Baseline visit8.8 (7.1, 10.6)8.9 (7.3, 10.6)
    Last follow-up visit16.6 (15.1, 17.7)16.6 (15.0, 17.7)
Race/ethnicity, %
    White/other75.578.3
    Black13.214.4
    Hispanic11.37.2
Tanner stage, %
    Baseline visit
        Stage 171.370.5
        Stage 222.617.0
        Stage 34.48.1
        Stage 41.73.5
        Stage 50.00.9
    Last follow-up visit
        Stage 15.62.6
        Stage 24.34.3
        Stage 37.310.1
        Stage 417.120.2
        Stage 565.662.8
Height, median (quartiles), m
    Baseline visit1.33 (1.23, 1.43)1.32 (1.23, 1.43)
    Last follow-up visit1.74 (1.68, 1.79)1.62 (1.58, 1.66)
BMI, median (quartiles), kg/m2
    Baseline visit17.2 (15.8, 19.9)17.3 (15.7, 20.4)
    Last follow-up visit22.6 (20.3, 26.1)22.7 (20.3, 26.6)
BMI for age, median (quartiles), percentile
    Baseline visit70.6 (44.0, 90.2)70.5 (41.6, 89.7)
    Last follow-up visit72.6 (46.2, 90.7)74.1 (51.2, 90.9)