Abstract
Children, aged 9–10½, from 22 villages in Jing County, Hubei Province, China, with different levels of fluoride in the drinking water were tested for their IQs according to the revised version of Raven’s Standard Progressive Matrices. Among 141 children in villages with 2.1–4.0 ppm F in the drinking water, 34 (24.11%) had IQ scores in the top three categories (1–3) of intelligence; among 147 children in the villages with 0.1–0.2 ppm F, the number was 40 (27.21%), and among 159 children in villages with a “normal” 0.5–1.0 ppm F, the number was 92 (57.86%). For the lowest two IQ categories (4 and 5), the percentages were, respectively, 75.89, 72.79, and 42.14%. The reasons for this non-monotonic pattern are not clear.
Translated by Julian Brooke for the Fluoride Action Network and published with the concurrence of the Chinese Journal of Control of Endemic Diseases 1990;5(4):203-4 in the journal Fluoride.
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OP V – 2 Prenatal fluoride exposure and neurobehavior among children 1–3 years of age in Mexico
Background/aim Recent studies report an inverse association between fluoride (F) exposure and IQ in children, but few included individual measures of exposure or assessed associations with prenatal exposure using a prospective study design. Methods This study utilised the Early Life Exposures in Mexico to Environmental Toxicants (ELEMENT) birth cohort and archived pregnancy samples
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Research on the effects of fluoride on child intellectual development under different environments
Goal: To study the effects of the fluoride and iodine content of drinking water on child intellectual development and the interaction between the two factors and also the relationship of educational factors to such development. Methods: The subjects of the investigation were 8- to 14-year-old children randomly selected from endemic areas as well
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Intelligence quotient of 7 to 9 year-old children from an area with high fluoride in drinking water.
This paper reports the effect of chronic high fluoride exposure on children's intelligence quotient (IQ). In this cross sectional study, two urban communities with similar socio-economic and cultural status but with different levels of fluoride in drinking water, in Kerman province of Iran were studied: Koohbanan City (fluoride 2.38 mg/L),
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Effect of high fluoride water on intelligence of school children in India.
The intelligence quotient (IQ) was measured in 190 school-age children, 12–13 years old, residing in two village areas of India with similar educational and socioeconomic conditions but differing in fluoride (F) concentration in the drinking water. The children in the high F area (drinking water F 5.55±0.41 mg/L) had higher
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Effect of high water fluoride concentration on the intellectual development of children in Makoo/Iran.
OBJECTIVE: Prolonged excessive intake of fluoride during child's growth and development stages has been associated with mental and physical problems. The aim of this study was to investigate the effect of excessive fluoride intake on the intelligence quotient (IQ) of children living in five rural areas in Makoo/Iran. MATERIALS AND METHODS:
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