The timeline correlates well with rollout of mass poisoning.
US studies agree.
China of course does not poison its water supply with Fluoride waste.
A nice 2020 study was supported by Yale University.
Note the confrmation of dose dependence, not only of diagnosed ADHD, but other behavioural problems.
![A nice 2020 study was supported by Yale University.]({"t":"ext_link","c":{"dest":"https://geoffpain.substack.com/p/adhd-and-fluoride?img=https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F72adcdb0-0b1d-42b1-836a-16d731d171fa_710x534.jpeg&open=false"},"tooltip":""}){kind=link}