this post was submitted on 09 May 2025
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It's a reasonable theory. We have seen people develop Parkinsonian symptoms after exposure to toxins before - https://pmc.ncbi.nlm.nih.gov/articles/PMC9918159/
The statistics are interesting. If I understand correctly, they picked a group of people with Parkinson's and then identified 20 community-dwelling demographic-matched seniors who were the same age at the time of diagnosis. Then, they looked at the closest distance that the people lived to a golf course within 3 years prior to diagnosis, and computed the likelihood of developing Parkinson's based on demographics, distance to a golf course, and certain characteristics of the water and soil.
I'm not sure your assessment of the odds is accurate going from 9 out of 9000 to 10 out of 9000 should be an 11% increase. This paper shows something like 100% increase within 3 miles of a golf course. So that's 9 in 9000 to 18 in 9000. Still low risk but enough to make scientists go "huh" and maybe for politicians to consider changing regulations about pesticides (I wish). It's not just golf courses to worry about, though. Think of all the farmers, too, who are exposed to similar toxins.
The drinking water angle was added to see of certain soil or sources of drinking water would impact the odds of PD diagnosis. The paper was based on data from Minnesota iirc, so I would expect more rural people to have private wells. My understanding was it was less about "statistical significance" and more about "seeing if this variable can explain away the apparent impact of golf course proximity".