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“These results do not allow us to make any judgment regarding possible levels of risk at levels of exposure typical for water fluoridation in the U.S.,” the researchers said in an e-mail response to questions from The Eagle. “On the other hand, neither can it be concluded that no risk is present.”
“further research to clarify what role fluoride exposure levels may play in possible adverse effects on brain development, so that future risk assessments can properly take into regard this possible hazard.”
We did not find conclusive evidence of publication bias, though there was substantial
heterogeneity among studies. Drinking-water may contain other neurotoxicants, such as arsenic,
but exclusion of studies including arsenic and iodine as co-exposures in a sensitivity analysis
resulted in a lower estimate, although the difference was not significant. The exposed groups
had access to drinking-water with fluoride concentrations up to 11.5 mg/L (Wang et al. 2007),
thus in many cases concentrations were above the levels of 0.7-1.2 mg/L (HHS) and 4.0 mg/L
(US EPA) considered acceptable in the US. A recent cross-sectional study based on individual level
measure of exposures suggested that low levels of water fluoride (range 0.24 to 2.84 mg/L)
had significant negative associations with child’s intelligence (Ding et al. 2011). This study was
not included in our meta-analysis, which focused only on studies with exposed and reference
groups, thereby precluding estimation of dose-related effects.
And, it also compared 0.8 ppm to 7.0 ppm!
Originally posted by UdonNiedtuno
What the researchers from Harvard actually said was that this data can't be used to extrapolate effects in the U.S. because most all water supplies are fluoridated at 0.7-1.2 ppm and this study compared 2 water supplies with fluoride levels of 0.3 ppm and 2.3 ppm (roughly) so you can't use that to determine what a level of 1.2 ppm might do. WHICH IS SCIENTIFICALLY CORRECT!
The Pure Water Committee of Western Maryland Inc. was formed in 1960 as a grass roots network of citizens with a 50-year-old mission to educate the public of the complete fraud of the practice called water fluoridation.
Recently, it has come to my attention in an engineering report for the city of Boulder, Colo., that they did an evaluation of fluoridation chemicals and sources and found that much of the fluoride chemicals used for water fluoridation are now coming out of China with arsenic and lead levels of 50 and 40 milligrams respectively per bag and non-existent regulatory monitoring of the salt or acid compounds from these imports.
Originally posted by UdonNiedtuno
What the researchers from Harvard actually said was that this data can't be used to extrapolate effects in the U.S. because most all water supplies are fluoridated at 0.7-1.2 ppm and this study compared 2 water supplies with fluoride levels of 0.3 ppm and 2.3 ppm (roughly) so you can't use that to determine what a level of 1.2 ppm might do. WHICH IS SCIENTIFICALLY CORRECT!
Maximum Contaminant Level Goal (MCLG) = 4 mg/L or 4 ppm
Originally posted by Arbitrageur
And, it also compared 0.8 ppm to 7.0 ppm!
Xu et al. 1994 Shandong,
China
97 32 8-14 Drinking water 1.8 mg/L (high)
0.8 mg/L (reference)
Binet-Siman Children had lower IQ
scores in high fluoride area
than those who lived in the
reference area
Yao et al. 1996 Liaoning,
China
266 270 8-12 Drinking water 2-11mg/L (high)
1 mg/L (reference)
Average IQ scores of
children residing in
exposed fluoride areas
were lower than those in
the reference area
Li et al. 1995 Guizhou,
China
681 226 8-13 Urine,
Dental Fluorosis
1.81-2.69 mg/L (high);
1.02 mg/L (reference);
Children living in fluorosis
areas had lower IQ scores
than children living in non-
fluorosis areas
Lin et al. 1991 Xinjiang,
China
33 86 7-14 Drinking
water
0.88mg/L (high);
0.34 mg/L (reference)
Children in the high
fluoride (low iodine) area
had lower IQ scores
compared with the children
from the reference fluoride
(low iodine) areas
Yao et al. 1997 Liaoning,
China
188 314 7-14 Drinking water 2 mg/L(exposed)
0.4 mg/L (reference)
IQ scores of children in the
high fluoride area were
lower than those of
children in the reference
area
Lu et al. 2000 Tianjin,
China
60 58 10-12 Drinking water 3.15 mg/L (high)
0.37 mg/L (reference)
Children in the high
fluoride area scored
significantly lower IQ
scores than those in the
reference area
Hong et al.
2001
SShandong,
China
85 32 8-14 Drinking water 2.90 mg/L (high)
0.75 mg/L (reference)
Average IQ scores were
significantly lower in high
fluoride group (and iodine)
than the reference group
Seraj et al. 2006 Tehran,
Iran
Drinking water 2.5 mg/L(high)
0.4 mg/L (reference)
The mean IQ of children in
the high fluoride area was
significantly lower than
that from the reference
fluoride area
Li et al. 2009
Hunan,
China
60 20 8-12 Coal burning 1.24-2.34 mg/L (high)
0.962 mg/L (reference)
Mean IQ was lower in
children in coal-burning
areas compared to those in
the reference group
Poureslami
et al. 2011
Iran 59 60 6-9 Drinking
Water
2.38 mg/L (high)
0.41 mg/L (reference)
Raven Children in the high
fluoride group scored
significantly lower than
those in reference group
Originally posted by TheLegend
Remove the 7ppm and 13ppm studies, you will have the same results.
How can the rest of the humanity have their I.Q. negatively effected by fluoride by somehow American are immune to the same side effects?
Originally posted by UdonNiedtuno
What the researchers from Harvard actually said was that this data can't be used to extrapolate effects in the U.S. because most all water supplies are fluoridated at 0.7-1.2 ppm and this study compared 2 water supplies with fluoride levels of 0.3 ppm and 2.3 ppm (roughly) so you can't use that to determine what a level of 1.2 ppm might do. WHICH IS SCIENTIFICALLY CORRECT!
I