Table 1.
Demographic characteristics of women aged 15–44 years by race/ethnicity, NHANES 2001–2008
| Total | Non-Hispanic white‡ | Non-Hispanic black‡ | Mexican American‡ | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unweighted n | % | 95 % CI | Unweighted n | % | 95 % CI | Unweighted n | % | 95 % CI | Unweighted n | % | 95 % CI | |
| Women aged 15–44 years (%) | 5369 | – | – | 2065 | 65·9 | 61·8, 69·8 | 1384 | 13·5 | 11·3, 16·2 | 1362 | 10·0 | 8·4, 11·9 |
| Folic acid supplement use§ (%) | 1292 | 31·6 | 29·1, 34·2 | 720 | 37·1* | 33·3, 41·0 | 223 | 18·7* | 15·1, 23·0 | 221 | 19·1* | 15·9, 22·8 |
| Folic acid intake from supplements∥,¶ (μg/d) | – | 380 | 357, 403 | – | 391 | 364, 419 | – | 315† | 255, 374 | – | 345 | 272, 418 |
| Consumption of corn masa flour** (%) | 2083 | 32·0 | 29·9, 34·2 | 589 | 27·6* | 25·1, 30·3 | 413 | 29·6* | 26·2, 33·3 | 906 | 67·2* | 63·0, 71·2 |
| Usual energy intake†† (kJ/d) | 5369 | 7908 | 7518, 8297 | 2065 | 7971 | 7514, 8427 | 1384 | 7945 | 7682, 8209 | 1362 | 8000 | 7460, 8540 |
NHANES, National Health and Nutrition Examination Survey.
*Significantly different by race/ethnicity (Pearson χ 2 test): P < 0·05.
†Significantly different non-Hispanic whites v. non-Hispanic blacks (t test): P < 0·05.
‡Race/ethnicity sub-analyses were restricted to non-Hispanic whites, non-Hispanic blacks and Mexican Americans.
§Reported folic acid supplement use is defined as consuming a supplement containing folic acid in the previous 30 d.
∥Reported folic acid supplement use is among supplement users only.
¶Values are mean and 95 % confidence interval.
**Reported consumption of corn masa flour is defined as consuming products that could contain corn masa flour on either day 1 or day 2 of the survey.
††Values are median and interquartile range.