Table 1: Characteristics of US adolescents aged 12–19 years: NHANES III (1988–1994) and complete NHANES 1999–2004 cohorts.

NHANES IIINHANES III
Phase IPhase IINHANESNHANESNHANESNHANES IIINHANES
1988–19911991–19941999-20002001-20022003-20041988–19941999–2004

Number of Participants (n)1531170323082417224232346967
Age in years (mean)15.715.215.415.515.415.415.5
Sex (%)
Male50.950.651.550.651.150.751.1
Female49.149.448.549.448.949.348.9
Race/ethnicity (%)
Non-Hispanic white66.965.156.863.864.966.062.1
Non-Hispanic black15.415.614.913.915.715.514.8
Mexican American8.28.313.09.011.18.310.9
Other race–including multiracial4.84.87.35.33.64.85.3
Other Hispanic4.76.28.08.04.75.46.9