Table 1.
Descriptive characteristics
| N | Mean | SD | |
|---|---|---|---|
| Demographics | |||
| Race (n, black) | 160 | 80 | |
| Sex (n, female) | 160 | 80 | |
| Age (years) | 160 | 11.28 | 1.24 |
| Maturation (n, stage 2/3) | 160 | 97/63 | |
| Anthropometrics | |||
| Height (cm) | 160 | 150.86 | 8.93 |
| Height (Z-score) | 160 | 0.69 | 1.00 |
| Weight (kg) | 160 | 48.00 | 11.83 |
| Weight (Z-score) | 160 | 0.88 | 1.07 |
| BMI (kg/m2) | 160 | 21.00 | 4.36 |
| BMI (Z-score) | 160 | 0.82 | 1.18 |
| BMI (percentile) | 160 | 74.85 | 34.23 |
| Leg length (cm) | 160 | 34.78 | 2.86 |
| Arm length (cm) | 160 | 24.50 | 1.89 |
| Total Body | |||
| BMC (g) | 160 | 1538.15 | 302.79 |
| Tibia | |||
| MCSA (mm2) | 158 | 4958.24 | 1088.70 |
| Ct.vBMD (mg/cm3) | 154 | 1061.71 | 34.69 |
| Ct.BMC (mg/mm) | 154 | 251.35 | 47.77 |
| Tt.Ar (mm2) | 154 | 444.67 | 89.19 |
| Ct.Ar (mm2) | 154 | 236.80 | 45.01 |
| Ct.Th (mm) | 154 | 3.78 | 0.51 |
| Peri.Circ (mm) | 154 | 74.39 | 7.37 |
| Endo.Circ (mm) | 154 | 50.64 | 6.95 |
| pSSI (mm3) | 154 | 1662.63 | 474.07 |
| Radius | |||
| MCSA (mm2) | 160 | 2140.22 | 475.81 |
| Ct.vBMD (mg/cm3) | 156 | 1067.05 | 37.05 |
| Ct.BMC (mg/mm) | 156 | 63.19 | 12.92 |
| Tt.Ar (mm2) | 156 | 94.62 | 18.91 |
| Ct.Ar (mm2) | 156 | 59.10 | 11.38 |
| Ct.Th (mm) | 156 | 2.15 | 0.36 |
| Peri.Circ (mm) | 156 | 34.32 | 3.34 |
| Endo.Circ (mm) | 156 | 20.81 | 3.66 |
| pSSI (mm3) | 156 | 176.83 | 51.17 |
| Biochemistries | |||
| Glucose (mg/dL) | 160 | 89.23 | 6.93 |
| Insulin (uU/mL) | 159 | 20.43 | 11.67 |
| HOMA-IR | 159 | 4.54 | 2.77 |
| QUICKI | 159 | 0.31 | 0.02 |
| Pentosidine (pg/mL) | 158 | 55.29 | 35.55 |
BMI, body mass index; BMC, bone mineral content; MCSA, muscle cross-sectional area; Ct.vBMD, cortical volumetric bone mineral density; Ct.BMC, cortical bone mineral content; Tt.Ar, total bone area; Ct.Ar, cortical bone area; Ct.Th, cortical thickness; Peri.Circ, periosteal circumference; Endo.Circ, endosteal circumference; pSSI, polar strength strain index; HOMA-IR, homeostasis model assessment of insulin resistance; QUICKI, quantitative insulin sensitivity check index