Table 2a.
Subject characteristics and group differences: general.
| Variable | Total Sample (n= 103) | Cohort A (n=55) | Cohort B (n=48) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | s. d. | Min | Max | Mean | s. d. | Min | Max | Mean | s. d. | Min | Max | |
| Chronological Age (yrs) | 14.8 | 1.2 | 11.3 | 17.9 | 15.1b | 1.1 | 13.0 | 17.9 | 14.4 | 1.2 | 11.3 | 17.2 |
| Gynecological Age (yrs) | 1.8 | 0.4 | 0.9 | 2.6 | 2.0c | 0.4 | 1.0 | 2.6 | 1.7 | 0.4 | 0.9 | 2.6 |
| Age at Menarche (yrs) | 12.9 | 1.1 | 9.5 | 15.8 | 13.1a | 1.1 | 11.1 | 15.8 | 12.7 | 1.2 | 9.5 | 15.3 |
| Height (cm) | 161.2 | 6.3 | 144.2 | 178.0 | 161.2 | 6.0 | 148.6 | 178.0 | 161.3 | 6.7 | 144.2 | 174.5 |
| Weight (kg) | 56.2 | 8.4 | 39.8 | 89.2 | 54.5 | 7.3 | 39.8 | 84.4 | 58.0a | 9.3 | 41.8 | 89.2 |
| Body Mass Index (kg/m2) | 21.6 | 2.7 | 15.6 | 30.9 | 21.0 | 2.6 | 15.6 | 30.9 | 22.2a | 2.8 | 17.6 | 30.5 |
| Whole Body Non-bone Lean | 39.9 | 4.8 | 28.7 | 55.3 | 38.9 | 4.1 | 28.7 | 51.8 | 41.0c | 5.3 | 31.0 | 55.3 |
| Mass (kg) | ||||||||||||
| Percent Body Fat (%) | 24.5 | 4.8 | 13.6 | 35.9 | 23.8 | 4.7 | 13.6 | 35.5 | 25.3 | 5.0 | 17.9 | 35.9 |
| 3 Year Mean Arm totBLI | 8.7 | 8.1 | 0.05 | 32.5 | 8.4 | 8.4 | 0.05 | 29.3 | 9.1 | 7.7 | 0.6 | 32.5 |
| 3 Year Physical Activity (h) | 1256.8 | 732.8 | 30.4 | 3299.6 | 1198.8 | 196.2 | 30.4 | 2972.0 | 1322.8 | 669.6 | 192.4 | 3299.6 |
| 3 Year Mean Physical | 9.5 | 9.2 | 0.2 | 86.3 | 8.3 | 5.5 | 0.2 | 20.6 | 9.2 | 4.7 | 1.3 | 22.9 |
| Activity (h/wk) | ||||||||||||
BLI= Bone Loading Index; T-test for all, except 3 Year BLI, PA, Mean PA (Mann-Whitney U); Bolded variables indicate significant cohort differences:
a
p<0.05;
b
p≤0.01;
c
p≤0.001.