Table 1.
Demographic characteristics of the total US population and stratified by corn masa flour consumption and folic acid supplement use, NHANES 2001–2008
| Total US population | Corn masa flour consumers | Supplement non-users | Supplement users | |||||
|---|---|---|---|---|---|---|---|---|
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| Unweighted n | % (95% CI)a | Unweighted n | % (95% CI)b | Unweighted n | % (95% CI)b | Unweighted n | % (95% CI)b | |
| Total | 32,590 | – | 10,961 | 28.7 (27.3, 30.1) | 24,052 | 65.8 (64.4, 67.3) | 8,538 | 34.2 (32.7, 35.6) |
| Sex | ||||||||
| Males | 16,328 | 48.9 (48.1, 49.7) | 5,476 | 29.6 (28.0, 31.3) | 12,355 | 69.0 (67.5, 70.5)* | 3,973 | 31.0 (29.5, 32.5)* |
| Females | 16,262 | 51.1 (50.3, 51.9) | 5,485 | 27.9 (26.3, 29.5) | 11,697 | 62.8 (60.9, 64.7) | 4,565 | 37.2 (35.3, 39.1) |
| Race/ethnicityc | ||||||||
| Non-Hispanic white | 13,379 | 69.2 (65.9, 72.4) | 3,079 | 24.7 (23.3, 26.2)** | 8,420 | 60.5 (58.4, 62.6)** | 4,959 | 39.5 (37.4, 41.6)** |
| Non-Hispanic black | 8,048 | 12.1 (10.3, 14.2) | 2,112 | 25.0 (23.2, 26.8) | 6,607 | 79.6 (77.7, 81.3) | 1,441 | 20.4 (18.7, 22.3) |
| Mexican American | 7,994 | 9.2 (7.8, 10.9) | 4,848 | 64.6 (61.7, 67.4) | 6,598 | 80.8 (78.8, 82.7) | 1,396 | 19.2 (17.3, 21.2) |
| Age group, year | ||||||||
| <1 | 1,229 | 1.0 (1.0, 1.1) | 65 | 3.9 (2.8, 5.5) | 1,228 | 100 (99.7, 100) | 1 | 0 |
| 1–3 | 2,676 | 4.1 (3.9, 4.4) | 843 | 27.5 (25.1, 30.1) | 2,135 | 73.4 (71.2, 75.5) | 541 | 26.6 (24.5, 28.8) |
| 4–8 | 3,137 | 6.9 (6.5, 7.4) | 1,392 | 40.0 (36.8, 43.3) | 2,227 | 63.4 (59.7, 67.0) | 910 | 36.6 (33.0, 40.3) |
| 9–13 | 3,740 | 7.3 (6.8, 7.7) | 1,688 | 39.7 (37.0, 42.5) | 3,075 | 77.3 (74.6, 79.9) | 665 | 22.7 (20.1, 25.4) |
| 14–18 | 4,413 | 7.5 (6.9, 8.0) | 1,839 | 34.3 (31.9, 36.8) | 3,860 | 82.7 (80.1, 85.1) | 553 | 17.3 (14.9, 19.9) |
| 19–30 | 3,637 | 15.9 (15.0, 16.9) | 1,406 | 33.2 (30.6, 35.8) | 2,848 | 73.4 (70.9, 75.8) | 789 | 26.6 (24.2, 29.1) |
| 31–50 | 5,599 | 28.9 (27.8, 29.9) | 1,975 | 30.5 (28.4, 32.6) | 3,896 | 65.4 (63.0, 67.6) | 1,703 | 34.6 (32.4, 37.0) |
| 51–70 | 5,104 | 20.5 (19.3, 21.8) | 1,307 | 21.2 (19.0, 23.7) | 3,066 | 52.8 (49.8, 55.8) | 2,038 | 47.2 (44.2, 50.2) |
| >70 | 3,055 | 7.9 (7.3, 8.5) | 446 | 11.4 (9.8, 13.4) | 1,717 | 53.3 (50.9, 55.8) | 1,338 | 46.7 (44.2, 49.1) |
| Reported folic acid supplement used | 8,538 | 34.2 (32.7, 35.6) | 2,537 | 32.2 (30.4, 34.0) | – | – | – | – |
| Reported consumption of corn masa floure | 10,961 | 28.7 (27.3, 30.1) | – | – | 8,424 | 29.6 (27.9, 31.3) | 2,537 | 27.1 (25.5, 28.7) |
Percentages are column percents; weighted percentages.
Percentages are row percents; weighted percentages.
Race/ethnicity subanalyses 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 past 30 d.
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.
Significantly different by sex, P<0.05 (Pearson chi-square test).
Significantly different by race/ethnicity, P<0.05 (Pearson chi-square test).