Iodine deficiency and its association with intelligence quotient in schoolchildren from Colima, Mexico

Pineda-Lucatero, Alicia Getzabel; Ávila-Jiménez, Laura; Ramos-Hernández, Rosa Isela; Magos, C; Martı́nez, Homero

doi:10.1017/s1368980007001243

Cited by 15 publications

(5 citation statements)

References 34 publications

(40 reference statements)

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“…Children who had goitre had higher odds of getting a below-average score in school grade, compared with those who did not have goitre, in the present study. Other studies conducted in China ( 19 ) , Mexico ( 21 ) , Malaysia ( 20 ) and Tanzania ( 15 ) revealed a similar negative effect of IDD on the mental performance of schoolchildren.…”

Section: Discussionmentioning

confidence: 55%

The effect of iodine-deficiency disorders on academic achievement of schoolchildren in Southern Ethiopia

Wolka

Shiferaw

Biadgilign

2013

Public Health Nutr.

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Objective: The present study aimed to assess the effect of iodine deficiency on academic achievement of schoolchildren in Wolaita Sodo town, Southern Ethiopia. Design: School-based comparative cross-sectional study. Settings: Primary school in Sodo town, Southern Ethiopia. Subjects: A sample population of 270 children with goitre and 264 without goitre. All students in each class were examined for the presence of goitre and classified based on WHO recommendations. Results: Among children with goitre, a higher proportion (54?8 %) was female and the proportion increased with age. The odds of scoring low on school performance was higher among children whose fathers were illiterate (adjusted OR 5 1?9; 95 % CI 1?1, 3?5) and those who were absent for more than 5 d in the last academic year (adjusted OR 5 1?5; 95 % CI 1?1, 2?3). Goitre was significantly associated with low academic achievement (adjusted OR 5 1?8; 95 % CI 1?2, 2?5). Conclusions: The study showed that the presence of goitre has a negative effect on academic achievement even after accounting for parental education and absenteeism from school. Awareness of endemic goitre and its impact on school performance, and an emphasis on prevention and control by concerned bodies, are recommended to alleviate the problem.

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Section: Discussionmentioning

confidence: 55%

The effect of iodine-deficiency disorders on academic achievement of schoolchildren in Southern Ethiopia

Wolka

Shiferaw

Biadgilign

2013

Public Health Nutr.

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“…In Mexico, the last two national studies regarding iodine nutrition were performed between 1998 and 1999, the National Nutrition Survey (NNS-1999) (a probabilistic survey) and the Thyromobile program (with 23 sentinel sites), reported a median UIC of 235 and 176 μg/L, respectively (3)(4)(5). According to the USI program in Mexico, it is estimated that 94% table salt available in the market has more than 15 ppm of iodine (6); however, there are regions with still insufficient iodine content in table salt (7). In these regions, the sources of table salt are local and from artisanal producers that do not guarantee adequate iodine content (7).…”

Section: Introductionmentioning

confidence: 99%

“…According to the USI program in Mexico, it is estimated that 94% table salt available in the market has more than 15 ppm of iodine (6); however, there are regions with still insufficient iodine content in table salt (7). In these regions, the sources of table salt are local and from artisanal producers that do not guarantee adequate iodine content (7). There are no recent national surveys about iodine content in table salt in households of Mexico, and the consumption pattern of iodized salt is poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Iodine nutrition in elementary state schools of Queretaro, Mexico: correlations between urinary iodine concentration with global nutrition status and social gap index

García‐Solís

Solís-S

García-Gaytán

et al. 2013

Arq Bras Endocrinol Metab

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OBJECTIVE AND METHODS: To estimate median urinary iodine concentration (UIC), and to correlate it with global nutrition indicators and social gap index (SGI) in 50 elementary state schools from 10 municipalities in the State of Queretaro, Mexico. RESULTS: 1,544 students were enrolled and an above of requirements of iodine intake was found (median UIC of 297 µg/L). Iodine status was found as deficient, adequate, more than adequate and excessive in 2, 4, 19 and 25 schools, respectively. Seventy seven percent of table salt samples showed adequate iodine content (20-40 ppm), while 9.6% of the samples had low iodine content (< 15 ppm). Medians of UIC per school were positively correlated with medians of body mass index (BMI) by using the standard deviation score (SDS) (r = 0.47; p < 0.005), height SDS (r = 0.41; p < 0.05), and overweight and obesity prevalence (r = 0.41; p < 0.05). Medians of UIC per school were negatively correlated with stunting prevalence (r = -0.39; p = 005) and social gap index (r = -0.36; p < 0.05). Best multiple regression models showed that BMI SDS and height were significantly related with UIC (p < 0.05). CONCLUSIONS: There is coexistence between the two extremes of iodine intake (insufficient and excessive). To our knowledge, the observed positive correlation between UIC and overweight and obesity has not been described before, and could be explained by the availability and consumption of snack food rich in energy and iodized salt.

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“…• Iodide deficiency and thyroid hormone parameters in young children as predictors of neurodevelopmental impairment [19][20][21][22][23].…”

Section: Overview Of the Two-stage Approach Using Early Biomarkers Ofmentioning

confidence: 99%

Intermediate Effect Biomarkers--Alternatives to Direct Concentration- Response Data for Regulatory Benefits Analyses

Hattis¹

2011

TOEPIJ

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Perceived needs for extensive chemical-specific toxicological information have impeded efforts to assess risks and evaluate likely public health protection benefits of possible standards for hazardous air pollutants (HAPs). This paper discusses opportunities to use effects of HAPs on early effect biomarkers, such as birth weights, to predict likely changes in rare quantal effects of concern that would be relevant for the quantification of likely regulatory benefits from exposure reductions. In the birth weight example, even modest exposures to common air pollutants can be seen as producing a kind of tax on the limited resources available to the fetus to grow and develop. In contrast to teratogenic effects, dose response relationships for fetal growth restriction in animals are often nearly linear, suggesting that the developing fetus may not generally have untapped "functional reserve capacity" that is expected to buffer the effects of modest exposures to toxicants in the traditional toxicological paradigm. Given this mechanistic perspective, supported in part by parallel dose response relationships between reported cigarette smoking and both birth weight and infant mortality, restriction on fetal growth can be associated with changes in quantal end effects of concern that are more difficult to assess directly in epidemiological studies.

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Iodine deficiency and its association with intelligence quotient in schoolchildren from Colima, Mexico

Cited by 15 publications

References 34 publications

The effect of iodine-deficiency disorders on academic achievement of schoolchildren in Southern Ethiopia

The effect of iodine-deficiency disorders on academic achievement of schoolchildren in Southern Ethiopia

Iodine nutrition in elementary state schools of Queretaro, Mexico: correlations between urinary iodine concentration with global nutrition status and social gap index

Intermediate Effect Biomarkers--Alternatives to Direct Concentration- Response Data for Regulatory Benefits Analyses

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