Table 1. Characteristics of sample. Weighted percentage (unweighted n).
| Survey | NHANES I (1971-1975) | NHANES II (1976-1980) | NHANES III (1988-1994) | NHANES (1999-2000) | NHANES (2001-2002) | NHANES (2003-2004) | NHANES (2005-2006) |
|---|---|---|---|---|---|---|---|
| N(unweighted) | 19975 | 19118 | 26074 | 7891 | 8403 | 8007 | 8249 |
| Age distribution | |||||||
| 2 - 9 years | 15.1%(3674) | 15.7%(4172) | 12.9%(6584) | 13.1%(1451) | 11.9%(1621) | 12.0%(1509) | 11.5%(1712) |
| 10 – 19 years | 21.2%(3367) | 20.8%(3159) | 15.1%(4227) | 15.5%(2625) | 15.7%(2674) | 15.4%(2496) | 15.4%(2511) |
| 20 – 29 years | 16.5%(3101) | 17.7%(2558) | 16.1%(3349) | 14.5%(630) | 14.7%(754) | 13.8%(733) | 13.8%(780) |
| 30 – 39 years | 12.0%(2319) | 13.2%(1837) | 17.9%(3261) | 17.2%(678) | 15.4%(731) | 15.0%(684) | 14.4%(720) |
| 40 – 49 years | 12.2%(1954) | 10.8%(1456) | 14.1%(2581) | 15.0%(704) | 17.4%(853) | 16.6%(743) | 16.6% (803) |
| 50 – 59 years | 11.7%(1499) | 10.8%(1495) | 9.4%(1864) | 10.7%(544) | 12.5%(641) | 13.0%(568) | 13.8% (624) |
| 60 – 69 years | 8.5%(2595) | 8.2%(3301) | 8.6%(2353) | 8.5%(748) | 7.5%(660) | 8.2%(711) | 8.6% (645) |
| 70 – 79 years | 2.8%*(1466) | 2.8%*(1140) | 5.9%(1855) | 5.5%(511) | 4.9%(469) | 6.0%(563) | 5.9% (454) |
| Gender | |||||||
| Females | 51.1%(11441) | 49.9%(9694) | 50.5%(13514) | 50.1%(3905) | 50.2%(4174) | 50.1%(3932) | 49.9%(4053) |
| Race/ethnicity | |||||||
| White | 87.6%(15786) | 85.6%(16156) | - | - | - | - | - |
| Black | 11.4%(3970) | 11.8%(2546) | - | - | - | - | - |
| Non-Hispanic white | - | - | 73.0%(8814) | 68.0%(2540) | 69.0%(3387) | 69.6%(3170) | 68.3%(3026) |
| Non-Hispanic black | - | - | 12.3%(8095) | 12.0%(1940) | 12.2%(2235) | 12.5%(2290) | 12.5%(2318) |
| Mexican American | - | - | 6.2%(8018) | 7.7%(2758) | 8.5%(2170) | 9.2%(2029) | 9.4%(2230) |
| Other | 1.0%(219) | 2.6%(416) | 8.5%(1147) | 12.3%(653) | 10.3%(611) | 8.7%(518) | 9.8%(675) |
*
70-74 years