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Dr John @drjohndev.bsky.social · 26/11/2024

🧪Is this the slam-dunk study claiming negative correlation between IQ and fluoride concentration in water? There's a lot of wrong to unpack here (comments below), but if I'm missing something (on either side of the argument), please let me know. pmc.ncbi.nlm.nih.gov/articles/PMC...

pmc.ncbi.nlm.nih.gov

Effect of fluoridated water on intelligence in 10-12-year-old school children

The aim of the present study was to evaluate the relationship of drinking water fluoride levels with children's intelligence quotient (IQ). Water was collected from initially identified endemic fluori...

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Dr John @drjohndev.bsky.social · 26/11/2024

🧪1/ The mean IQ is actually highest for the medium level of Fluoride concentration (1.2-2ppm). In the study, participants consuming the medium Fluoride levels scored on average 15 points higher in boys, and 17 points higher in girls.

Mean IQ levels based on fluoride concentration among boys and girls.
Source: https://pmc.ncbi.nlm.nih.gov/articles/PMC5285601/table/T4/

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Dr John @drjohndev.bsky.social · 26/11/2024

🧪2/ The fluoride concentration levels along the horizontal axis are out of order. The Fluoride concentration does not monotonically rise from left to right, but the trend line monotonically decreases. This is misleading data presentation.

Correlation between IQ and fluoride concentration in total patients
SOURCE: https://pmc.ncbi.nlm.nih.gov/articles/PMC5285601/figure/G2/

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