Use of masks in public places in Poland during SARS-Cov-2 epidemic: a covert observational study.

BMC Public Health · 2021 · PMC7901005 · PMID 33622279

Europe PMC DOI

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a decreasing trendno p-value reported

A decreasing trend was observed in relation to mask use at three time points for both: the general public and females.

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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.