Water fluoridation: a critical review of the physiological effects of ingested fluoride as a public health intervention.

ScientificWorldJournal · 2014 · PMC3956646 · PMID 24719570

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did not reach statistical significanceno p-value reported

While fluoride's effect on IQ in this meta-analysis did not reach statistical significance, the combined effect at population level is remarkable.

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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.