Table 1.
Characteristics of the 1999–2002 NHANES sample of US adolescents
| Demographic Factors | N = 5306 | Weighted Percent |
| Age | ||
| 11–15 years old | 2919 | 56 |
| 16–19 years old | 2387 | 44 |
| Gender | ||
| Female | 2672 | 49 |
| Male | 2634 | 51 |
| Race/Ethnicity | ||
| Non-Hispanic White | 1375 | 61 |
| Non-Hispanic Black | 1575 | 15 |
| Mexican American | 1956 | 11 |
| All others | 400 | 14 |
| Family income | ||
| < $15,000 | 1212 | 20 |
| $15,000 – $34,999 | 1510 | 25 |
| $35,000 – $64,999 | 1096 | 25 |
| >$65,000 | 939 | 28 |
| Refused or don't know | 187 | 3 |
| Clinical Factors | ||
| Health status | ||
| Excellent/very good | 3320 | 71 |
| Good | 1515 | 23 |
| Poor/fair | 468 | 6 |
| Prescription medication user | ||
| No | 4203 | 73 |
| Yes | 1101 | 27 |
| Individual conditions | ||
| Asthma | 815 | 16 |
| ADHD | 356 | 9 |
| Hayfever | 583 | 13 |
| Headache | 1290 | 23 |
| Obesity | 650 | 10 |