"The percentage of children with IQ score < 70, or children with intellectual disabilities, increased significantly from 0% in the control group to 4, 3.3, and 8.3% in the high-fluoride, medium-As, and high-As groups, respectively."
4% of a population developed low IQs, when the water supply was contaminated with Fluoride.
This study examined the effects of Fluoride and Arsenic in IQ and height on Chinese villagers. I didn't look to see if both Fluoride and Arsenic were in the same water supply.
I am fairly certain that there is a more robust study, wherein the effects of just Fluoride was done with the blessings of the Chinese government. I couldn't find it, quickly, and I'm in a rush to leave the house.
"The percentage of children with IQ score < 70, or children with intellectual disabilities, increased significantly from 0% in the control group to 4, 3.3, and 8.3% in the high-fluoride, medium-As, and high-As groups, respectively."
4% of a population developed low IQs, when the water supply was contaminated with Fluoride.
https://pmc.ncbi.nlm.nih.gov/articles/PMC1852689/
This study examined the effects of Fluoride and Arsenic in IQ and height on Chinese villagers. I didn't look to see if both Fluoride and Arsenic were in the same water supply.
I am fairly certain that there is a more robust study, wherein the effects of just Fluoride was done with the blessings of the Chinese government. I couldn't find it, quickly, and I'm in a rush to leave the house.