Note from Fluoride Action Network:
This is a duplicate study of Lu et al. (2000).
Sixty children, aged 10 to 12, were randomly selected for IQ testing from
an area with high fluoride (3.15 mg F/L) in the drinking water along with 58 control
children of the same age from a nearby low fluoride (0.37 mg F/L) area. The two areas
are located approximately 5 km apart in the Tianjin Xiqing District, and both have
similar normal iodine levels, living standards, access to medical facilities, economic
development, educational level, etc. A single individual using the C2 version of the
Chinese Raven Test did the IQ testing. The mean IQ scores were significantly
different: 92.27±20.45 in the high F area and 103.05±13.86 in the low F area (P<0.01).
Within the seven categories of the scores, there were significantly more borderline
and low IQs in the high F area (13/60) than in the low F area (2/58) (p<0.01).]
Developmental Fluoride Neurotoxicity: Choi et al. Respond
Sabour and Ghorbani’s comments about the reported mean difference in IQ (intelligence quotient) scores reported in our article (Choi et al. 2012) suggest a misunderstanding of the scale unit we used and the public health significance of even a small decrease in the average IQ associated with exposure. We appreciate
Thyroid function, intelligence, and low-moderate fluoride exposure among Chinese school-age children.
Highlights Low-moderate fluoride was related to alterations in childhood thyroid function. Fluoride exposure was associated with a decrease in children’s intelligence. TT3, FT3 were positively related to the odds of developing high normal intelligence. TSH may modify the association of fluoride with children’s intelligence. Background: Thyroid hormones (THs) are critical for
Effect of fluoride in drinking water on dental caries and IQ in children.
The aim of this work was to evaluate the impact of fluoride exposure on the prevalence of dental caries and the intellectual ability of children. Method: In this cross-sectional study, 161 children from 9 to 10 years of age were evaluated. The concentration of fluoride in drinking water and urine was
The effect of high levels of arsenic and fluoride on the development of children’s intelligence.
In the fields of toxicology, histology, physiology and biochemistry, numerous research and reports have already been conducted on the poisonous effect of arsenic poisoning, fluoride poisoning, as well as the combined effect of arsenic and fluoride poisoning. Progress has been made likewise in relevant medical treatment, clinical diagnosis and water clean-up prevention
The relationships between low levels of urine fluoride on children’s intelligence, dental fluorosis in endemic fluorosis areas in Hulunbuir, Inner Mongolia, China.
There has been public concern about children's intellectual performance at high levels of fluoride exposure, but few studies provide data directly to the question of whether low fluoride exposure levels less than 3.0 mg/L in drinking water adversely associated with children's intelligence. In this survey, we investigated the effects of
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