Association of sleep duration in middle and old age with incidence of dementia.

Nat Commun · 2021 · PMC8058039 · PMID 33879784

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did not reach statistical significanceno p-value reported

There was also a signal of higher risk in participants with persistent long sleep and those who reported short sleep at least once, but the associations 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.