Increased risk of dementia in patients exposed to nitrogen dioxide and carbon monoxide: a population-based retrospective cohort study.

PLoS One · 2014 · PMC4130523 · PMID 25115939

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a clear trendno p-value reported

A clear trend that was detected was an increase in the risk of dementia as CO exposure increased.

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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.