Table 1.
Characteristics of US adolescents aged 12–19 years: NHANES III (1988–1994) and complete NHANES 1999–2004 cohorts.
| NHANES III | NHANES III | ||||||
|---|---|---|---|---|---|---|---|
| Phase I | Phase II | NHANES | NHANES | NHANES | NHANES III | NHANES | |
| 1988–1991 | 1991–1994 | 1999-2000 | 2001-2002 | 2003-2004 | 1988–1994 | 1999–2004 | |
| Number of Participants (n) | 1531 | 1703 | 2308 | 2417 | 2242 | 3234 | 6967 |
| Age in years (mean) | 15.7 | 15.2 | 15.4 | 15.5 | 15.4 | 15.4 | 15.5 |
| Sex (%) | |||||||
| Male | 50.9 | 50.6 | 51.5 | 50.6 | 51.1 | 50.7 | 51.1 |
| Female | 49.1 | 49.4 | 48.5 | 49.4 | 48.9 | 49.3 | 48.9 |
| Race/ethnicity (%) | |||||||
| Non-Hispanic white | 66.9 | 65.1 | 56.8 | 63.8 | 64.9 | 66.0 | 62.1 |
| Non-Hispanic black | 15.4 | 15.6 | 14.9 | 13.9 | 15.7 | 15.5 | 14.8 |
| Mexican American | 8.2 | 8.3 | 13.0 | 9.0 | 11.1 | 8.3 | 10.9 |
| Other race–including multiracial | 4.8 | 4.8 | 7.3 | 5.3 | 3.6 | 4.8 | 5.3 |
| Other Hispanic | 4.7 | 6.2 | 8.0 | 8.0 | 4.7 | 5.4 | 6.9 |