Developmental fluoride neurotoxicity: an updated review.

Environ Health · 2019 · PMC6923889 · PMID 31856837

Europe PMC DOI

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did not reach statistical significanceno p-value reported

All 14 studies reported apparent associations between elevated fluoride exposure and reduced intelligence, although one did not reach statistical significance.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.