Declines in mental health associated with air pollution and temperature variability in China.

Nat Commun · 2019 · PMC6520357 · PMID 31092825

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an increasing trendno p-value reported

With improved medical services, many epidemiological studies have suggested an increasing trend toward longevity, but also a higher prevalence of morbidity and disability among the global population 2 .

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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.