Table 1.
Description of Demographics and Serum 25(OH)D Levels in NHANES III and NHANES 2001–2004
| NHANES III (1988–1994)a |
NHANES 2001–2004a |
|||||
|---|---|---|---|---|---|---|
| No. of Participants | Estimated US Population, Millions | % of Participants (95% CI)b | No. of Participants | Estimated US Population, Millions | % of Participants (95% CI)b | |
| Total | 18 883 | 195 | 100 | 13 369 | 221 | 100 |
| Age, y | ||||||
| 12–19 | 2937 | 26 | 13 (13–14) | 4224 | 29 | 13 (12–14) |
| 20–39 | 6455 | 77 | 40 (38–42) | 3249 | 75 | 34 (32–36) |
| 40–59 | 4293 | 54 | 28 (27–29) | 2726 | 74 | 34 (32–35) |
| ≥60 | 5198 | 37 | 19 (17–21) | 3170 | 41 | 19 (18–20) |
| Sex | ||||||
| Male | 8840 | 94 | 48 (48–49) | 6512 | 107 | 49 (48–49) |
| Female | 10 043 | 101 | 52 (51–52) | 6856 | 114 | 51 (51–52) |
| Race/ethnicity | ||||||
| NH white | 7428 | 146 | 75 (72–78) | 6131 | 158 | 72 (67–76) |
| NH black | 5362 | 22 | 11 (10–13) | 3149 | 25 | 11 (9–14) |
| Mexican American | 5305 | 11 | 6 (5–7) | 3211 | 18 | 8 (6–11) |
| Other | 788 | 16 | 8 (7–10) | 878 | 20 | 9 (7–12) |
| 25(OH)D level, ng/mL | ||||||
| <10 | 684 | 4 | 2 (2–2) | 1321 | 14 | 6 (5–8) |
| 10 to <30 | 12 302 | 104 | 53 (51–55) | 9843 | 157 | 71 (68–73) |
| ≥30 | 5897 | 87 | 45 (43–47) | 2205 | 50 | 23 (20–26) |
Abbreviations: CI, confidence interval; NH, non-Hispanic; NHANES, National Health and Nutrition Examination Survey; 25(OH)D, 25-hydroxyvitamin D.
SI conversion factor: To convert 25(OH)D to nanomoles per liter, multiply by 2.496.
a
Some columns do not add to the totals because of missing data or rounding.
b
Estimated percentages of the US population, based on application of NHANES-provided survey weights.