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).]
A preliminary investigation of the IQs of 7–13 year old children from an area with coal burning-related fluoride poisoning.
The Chinese Binet IQ Test was used to investigate the IQs of 7–13 year- old children suffering from dental fluorosis, living and attending school in an area with coal burning-related fluoride poisoning. The average IQ of these children was found to be markedly lower than in the control area, and
Study of cognitive function impairment caused by chronic fluorosis.
Objective: To investigate whether an impairment in cognitive function exists in patients diagnosed with fluoride poisoning as well as its biological basis. Methods: Individuals suffering from fluoride poisoning from a high fluorine region were selected for the study group, while healthy individuals from a nonendemic region were selected as the control group. Using
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
Developmental neurotoxicity of fluoride: a quantitative risk analysis toward establishing a safe daily dose of fluoride for children
Background: A recent 2015 study from New Zealand indicated water fluoridation did not have an effect on children’s IQs. A 2012 meta-analysis showed that children with higher fluoride exposure have lower IQs than similar children with lower exposures. Levels of the fluoride ion (F) in blood and urine in children
Fluoride, IQ, and advice on type I and II errors
A 38-year prospective study of 992 New Zealand children on fluoride (F) and IQ, of whom an uncertain number (0–101) had not received, at age 5 years, additional F with F tablets (taken: 139, not taken: 763, unknown: 90), community water fluoridation (CWF) (lived in CWF area: 891, never lived
Related Studies :
Fluoride & IQ: The 64 Studies
As of December 2019, a total of 72 studies have investigated the relationship between fluoride and human intelligence. Of these investigations, 64 studies have found that elevated fluoride exposure is associated with reduced IQ in humans, while over 60 animal studies have found that fluoride exposure impairs the learning and/or
Fluoride Affects Learning & Memory in Animals
An association between elevated fluoride exposure and reduced intelligence has now been observed in 64 IQ studies. Although a link between fluoride and intelligence might initially seem surprising or random, it is actually consistent with a large body of animal research. This animal research includes the following 45 studies (out
NRC (2006): Fluoride's Neurotoxicity and Neurobehavioral Effects
The NRC's analysis on fluoride and the brain.
Fluoride's Effect on Fetal Brain
The human placenta does not prevent the passage of fluoride from a pregnant mother's bloodstream to the fetus. As a result, a fetus can be harmed by fluoride ingested pregnancy. Based on research from China, the fetal brain is one of the organs susceptible to fluoride poisoning. As highlighted by the excerpts
Fluoride's Direct Effects on Brain: Animal Studies
The possibility that fluoride ingestion may impair intelligence and other indices of neurological function is supported by a vast body of animal research, including over 40 studies that have investigated fluoride's effects on brain quality in animals. As discussed by the National Research Council, the studies have consistently demonstrated that fluoride, at widely varying concentrations, is toxic to the brain.
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