Table 1.

Sociodemographic, anthropometric, and biochemical characteristics of the Uruguayan schoolchildren in the study

Variables	N	% missing	All participants
Sociodemographic
Age in months (median, IQR)	351	0.6	81 (8)
Child’s gender	353	0.0
Male (n, %)			195, 55.2%
Female (n, %)			158, 44.8%
Mother’s education	334	5.4
Primary (n, %)			65, 19.5%
Secondary (n, %)			206, 61.7%
Baccalaureate or higher (n, %)			63, 18.9%
More than 2 persons/bedroom	306	13.3
Yes (n, %)			65, 21.2%
No (n, %)			241, 78.8%
Household possessions score	308	12.7
Below median (n, %)			170, 55.2%
Above median (n, %)			138, 44.8%
Source of drinking water	303	14.2
Tank/tap unfiltered (n, %)			94, 31.0%
Tap filtered (n, %)			57, 18.8%
Bottled with other source (n, %)			152, 50.2%
Folate intake, μg dfe*	321	9.07
From fortified foods and supplements (mean, SD)			345.3 (158.3)
From dietary sources (mean, SD)			130.3 (50.1)
Total folate from all sources (mean, SD)			337.4 (123.3)
<200 dietary folate equivalents (n, %)			37, 11.5%
Anthropometric
Height for age, z score (mean, SD)	324	8.2	0.47 (1.1)
Weight for age, z score (mean, SD)	324	8.2	0.78 (1.3)
BMI for age, z score (mean, SD)	324	8.2	0.69 (1.3)
Overweight (n, %)			130, 40.1%
Obese (n, %)			57, 17.6%
Biochemical
Blood lead, μg/dL (median, IQR)	315	10.8	3.8 (2.1)
Hemoglobin, g/dL (median, IQR)	322	8.8	13.1 (1.3)
Urinary DMA, μg/l (median, IQR)	324	8.2	9.5 (8.5)
Urinary MMA, μg/l (median, IQR)	324	8.2	1.3 (1.0)
Urinary iAs, μg/l (median, IQR)	324	8.2	1.3 (0.8)
Total urinary As, μg/l (median, IQR)	324	8.2	11.9 (9.8)
%DMA (mean, SD)	324	8.2	78.9 (7.4)
%MMA (mean, SD)	324	8.2	9.7 (3.6)
% iAs (mean, SD)	324	8.2	11.5 (5.8)

^*Not adjusted for energy intake