Effects of speech duration and voice volume on the respiratory aerosol particle concentration.

Environ Health Prev Med · 2025 · PMC11925707 · PMID 40044154

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a significant trendno p-value reported

There was also a significant trend in number concentration for 30 s speech compared with 10 s speech.

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an increasing trendno p-value reported

Therefore, as the number of participants increased, an increasing trend in aerosol number concentration was also observed at medium and loud voice volumes.

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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.