Table 2.

Percentage of US population aged ≥19 year and those who report consuming corn masa flour, overall and stratified by folic acid supplement use, exceeding the tolerable upper intake level (UL)^a for usual total folic acid intake without (current) and with (modeled) folic acid fortification of corn masa flour by sex, race/ethnicity, and age, NHANES 2001–2008^b,^c

	Total			Non-supplement users			Supplement users
	% ≥1,000 µg of total folic acid/day (95% CI)			% ≥1,000 µg of total folic acid/day (95% CI)			% ≥1,000 µg of total folic acid/day (95% CI)
	Unweighted n	Current usual intake	Modeled usual intake	Unweighted n	Current usual intake	Modeled usual intake	Unweighted n	Current usual intake	Modeled usual intake
Total	1,7395	2.5 (1.6, 3.3)	2.6 (1.6, 3.5)	11,527	0	0	5,868	8.3 (5.4, 11.2)	8.6 (5.4, 11.7)
Sex
Males	8,675	2.0 (1.6, 2.4)	2.1 (1.7, 2.4)	6,026	0	0	2,649	7.5 (5.2, 9.7)	7.7 (5.3, 10.1)
Females	8,720	2.9 (2.0, 3.8)	3.0 (2.2, 3.9)	5,501	0	0	3,219	8.9 (6.8, 11.1)	9.2 (7.0, 11.3)
Race/ethnicityd
Non-Hispanic white	8,829	3.3 (2.7, 4.0)	3.5 (2.8, 4.1)	5,055	0	0	3,774	8.8 (6.1, 11.4)	9.0 (6.2, 11.7)
Non-Hispanic black	3,634	0.7 (0.2, 1.2)	0.8 (0.4, 1.1)	2,745	0	0	889	5.0 (2.9, 7.1)	5.0 (3.0, 7.0)
Mexican American	3,373	0.6 (0.3, 0.9)	0.8 (0, 1.9)	2,611	0	0	762	6.2 (3.8, 8.5)	6.5 (4.7, 8.3)
Age group, year
19–30	3,637	1.2 (0.8, 1.7)	1.4 (0.9, 1.8)	2,848	0	0	789	8.9 (2.6, 15.2)	9.4 (1.9, 16.9)
31–50	5,599	1.9 (1.0, 2.7)	2.0 (1.1, 2.9)	3,896	0	0	1,703	NEe,f	NEe,f
51–70	5,104	3.7 (1.9, 5.6)	3.8 (2.1, 5.6)	3,066	0	0	2,038	9.0 (6.8, 11.1)	9.1 (7.1, 11.1)
> 70	3,055	2.7 (1.9, 3.5)	2.7 (1.9, 3.5)	1,717	0	0	1,338	6.6 (4.3, 9.0)	6.6 (4.4, 8.8)
	US population aged≥19 year who report consuming corn masa flour
	Total			Non-supplement users			Supplement users
	% ≥1,000 µg of total folic acid/day (95% CI)			% ≥1,000 µg of total folic acid/day (95% CI)			% ≥1,000 µg of total folic acid/day (95% CI)
	Unweighted n	Current usual intake	Modeled usual intake	Unweighted n	Current usual intake	Modeled usual intake	Unweighted n	Current usual intake	Modeled usual intake
Total	5,134	1.9 (0.7, 3.0)	2.1 (0.7, 3.5)	3,590	0	0	1,544	7.8 (4.7, 10.9)	8.5 (6.2, 10.7)
Sex
Males	2,569	0.8 (0.4, 1.2)	0.9 (0.5, 1.3)	1,876	0	0	693	4.5 (1.5, 7.4)	5.4 (2.3, 8.5)
Females	2,565	2.7 (0.4, 5.0)	3.0 (0.7, 5.2)	1,714	0	0	851	9.8 (5.4, 14.1)	10.0 (0, 24.2)
Race/ethnicityd
Non-Hispanic white	1,804	2.8 (1.0, 4.6)	5.3 (1.2, 5.4)	1,024	0	0	780	8.7 (4.2, 13.2)	9.4 (6.0, 12.8)
Non-Hispanic black	680	0.2 (0, 0.5)	0.2 (0, 0.4)	510	0	0	170	NEe,f	NEe,f
Mexican American	2,223	0.2 (0.1, 0.4)	0.4 (0, 0.8)	1,746	0	0	477	4.5 (2.6, 6.4)	5.2 (2.6, 7.8)
Age group, year
19–30	1,406	0.4 (0.1, 0.6)	0.5 (0.2, 0.7)	1,141	0	0	265	5.7 (0, 13.4)	6.6 (0, 22.4)
31–50	1,975	1.1 (0, 2.1)	1.2 (0.4, 2.0)	1,382	0	0	593	5.6 (2.7, 8.6)	6.4 (3.7, 9.1)
51–70	1,307	4.3 (0, 9.2)	4.8 (0, 9.7)	790	0	0	517	10.5 (8.3, 16.6)	11.1 (4.2, 18.0)
>70	446	0.3 (0, 0.6)	0.3 (0, 0.7)	277	0	0	169	1.5 (0, 4.4)	1.6 (0, 4.7)

^aUL defined as ≥1,000 µg total folic acid.

^bData are adjusted for intake day of the week and interview method (in person or by telephone).

^cAll P-values comparing current and modeled percent over the UL were not statistically significant (t-test, P>0.05).

^dRace/ethnicity subanalyses were restricted to non-Hispanic whites, non-Hispanic blacks, and Mexican Americans.

^eNE=not estimable.

^fNE due to instability in the measurement error model or degrees of freedom<12.