The ambient ozone and COVID-19 transmissibility in China: A data-driven ecological study of 154 cities.

J Infect · 2020 · PMC7342057 · PMID 32652165

Europe PMC DOI

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failed to reach statistical significanceno p-value reported

By contrast, associations with other pollutants failed to 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.