Characterization of respiratory particles released during continuous speech and its relation to mask performance.

Sci Rep · 2025 · PMC12003668 · PMID 40240460

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a decreasing trendno p-value reported

In the first scenario [Figure 4 (a)], the number concentration of particles emitted during speaking is clearly characterized by a decreasing trend.

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a notable trendno p-value reported

Moreover, when considering individual variability, it is valuable to take into account the temporal aspect of particle emission; for example, a notable trend of emitting a high number of particles at the outset, followed by a substantial decrease in subsequent values in the case of speaking activities belonging to scenario #1.

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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.