Table 1.
Baseline demographics and lifestyle characteristics of 6712 preadolescent, adolescent, and young adult females in the Growing Up Today Study
| Mean (SD) age (years) | 11.6 (1.6) |
| % White | 93.6% |
| Mean (SD) body mass index (kg/m2) | 19.0 (3.3) |
| % Overweight or obese | 19.8% |
| % Underweight | 8.6% |
| Mean (SD) age at menarche (years) | 12.3 (1.2) |
| % Maternal history of low bone density or osteoporosis | 10.4% |
| Mean (SD) calcium intake (mg/day) | 1181.5 (478.1) |
| Mean (SD) vitamin D intake (IU/day) | 376.2 (183.0) |
| Mean (SD) daily servings of dairy | 2.0 (1.3) |
| Mean (SD) hours/week of high-impact activitya | 5.2 (4.1) |
a
Sum of basketball, running, soccer, tennis, cheerleading, and volleyball.