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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A Benchmark Dose Analysis for Maternal Pregnancy Urine-Fluoride and IQ in Children.
This article is a preprint and has not been peer-reviewed. It reports new medical research that has yet to be evaluated and so should not be used to guide clinical practice. Abstract As a safe exposure level for fluoride in pregnancy has not been established, we used data from two prospective studies
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A correlation between serum vitamin, acetylcholinesterase activity and IQ in children with excessive endemic fluoride exposure in Rajasthan, India
Fluoride is widely distributed in nature and a direct source of adverse health effects in human populations. Fluoride poisoning attributed by long-term exposure to high levels of fluoride [is] called fluorosis. The present study was carried out among 9-14 years old school children of Dausa district, Rajasthan India. The subjects
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Investigation and Analysis of Children’s IQ and Dental Fluorosis in a High Fluoride Area
Objective: To understand the relationship of dental fluorosis and IQ among children in a high fluoride area and further study the harm of high fluoride to the human body. Method: High fluoride areas (from drinking water) in Qi County were selected as the site of investigation. The subjects of the study
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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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Comparative assessment of the physical and mental development of children in endemic fluorosis area with water improvement and without water improvement.
Tests were performed to compare the IQ and physical development of 7-to-14-year-old children from endemic fluorosis areas, with and without water improvement programs, with children from a nonfluorosis area. The results showed that the average IQ of children in each age group from the fluorosis area without water improvement is lower than those
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