Table 1.
Descriptive statistics
| Variable | BMDCS cohort (n = 1546)
|
RDP sample (n = 650)
|
||||||
|---|---|---|---|---|---|---|---|---|
| Mean | sd | Minimum | Maximum | Mean | sd | Minimum | Maximum | |
| Age (yr) | 11.8 | 2.7 | 7.0 | 17.0 | 11.4 | 2.7 | 7.0 | 17.0 |
| Height age (yr)a | 11.5 | 2.7 | 5.6 | 19.4 | 11.4 | 2.8 | 5.6 | 19.4 |
| Height Z-score | 0.2 | 0.8 | −2.6 | 2.7 | 0.3 | 0.9 | −2.3 | 3.2 |
| Weight Z-score | 0.3 | 0.8 | −2.2 | 2.4 | 0.4 | 1.0 | −2.3 | 3.5 |
| BMI Z-score | 0.3 | 0.9 | −2.7 | 2.3 | 0.4 | 1.0 | −3.3 | 3.0 |
a
n = 1420 for the Bone Mineral Density in Childhood Study (BMDCS) cohort and n = 593 for the Reference Data Project (RDP) sample.