Table 1.
Descriptive characteristics of pre-pubertal girls (n=50; Tanner breast and pubic stage= 1).
| Mean ± SD | Range | |
|---|---|---|
| Age (years) | 9.5 ± 1.2 | 7.8–12.8 |
| Weight (kg) | 29.2 ± 5.4 | 19.8–45.2 |
| Height (standing, cm) | 133.1 ± 8.8 | 116.0–156.5 |
| BMI (weight/height2: kg/m2) | 16.4 ± 1.8 | 13.5–24.8 |
| BMI for age (percentile rank) | 43.1± 25.3 | 4–98 |
| Fat Mass (kg) | 5.8 ± 2.4 | 1.9–16.8 |
| Total Lean Mass (kg) | 20.4 ± 3.9 | 13.8 –33.0 |
| Soft lean tissue Mass (kg) | 19.6 ± 3.7 | 13.3–31.7 |
| Percent Lean Mass (%) | 78.4 ± 5.0 | 59.1–88.7 |
| Percent Fat Mass (%) | 21.7 ± 5.0 | 11.3 – 40.9 |
| Physical Activity (h/wk) | 6.9 ± 5.1 | 0.1–21.5 |
| PABMC (g) | 5.25 ± 1.28 | 3.32–9.58 |
| PABMD (g/cm2) | 0.623 ± .073 | 0.461–0.883 |
| PAWIDTH (cm) | 5.69 ± 0.45 | 4.66–7.20 |
| LATBMC (g) | 3.22 ± 0.76 | 1.95–5.73 |
| LATHEIGHT (cm) | 1.47 ± 0.20 | 1.08–1.93 |
| LATDEPTH (cm) | 3.72 ± 0.25 | 3.07–4.43 |
| PALATBMAD (g/ cm3) | 0.13 ± 0.01 | 0.10–0.15 |
| PALATIBS (g2/cm4) | 0.29 ± 0.07 | 0.17–0.58 |
| FRI | 1.66 ± 0.02 | 1.01 – 2.82 |
PABMC= postero-anterior areal bone mineral content; PABMD= postero-anterior bone mineral density; PAWIDTH= postero-anterior vertebral width; LATBMC: lateral bone mineral content; LATHEIGHT= lateral vertebral height; LATDEPTH= lateral vertebral depth; PALATBMAD= veterbral bone mineral apparent density. PALATIBS= index of structural strength in axial compression; FRI=Fracture risk index.