Table 1.
Characteristics of the study population (n=3106).
| N | % | |
|---|---|---|
| Age at Interview | ||
| 11 - 13 | 1801 | 58.0 |
| 14 - 17 | 839 | 27.0 |
| 18 - 21 | 466 | 15.0 |
| Race/Ethnicity | ||
| Non-Hispanic White | 1645 | 53.0 |
| Non-Hispanic Black | 1010 | 32.5 |
| Hispanic/Other | 451 | 14.5 |
| Household Income | ||
| Less than $35,000 | 1088 | 35.0 |
| $35,000-$49,999 | 636 | 20.5 |
| $50,000 or more | 1382 | 44.5 |
| Parent’s Education | ||
| Less than High School | 447 | 14.4 |
| High School Graduate | 2050 | 66.0 |
| College Graduate | 609 | 19.6 |
| Age at Breast Development | ||
| 8 - 10 | 922 | 29.7 |
| 11 - 13 | 1870 | 60.2 |
| ≥ 14 | 102 | 3.3 |
| Not occurred | 212 | 6.8 |
| Age at Body Hair Growth | ||
| 8 - 10 | 730 | 23.5 |
| 11 - 13 | 2008 | 64.6 |
| ≥ 14 | 78 | 2.5 |
| Not occurred | 290 | 9.3 |
| Age at Menarche | ||
| 8 - 10 | 306 | 9.9 |
| 11 - 13 | 1709 | 55.0 |
| ≥ 14 | 179 | 5.8 |
| Not occurred | 912 | 29.3 |