Facemasks, hand hygiene, and influenza among young adults: a randomized intervention trial.

PLoS One · 2012 · PMC3266257 · PMID 22295066

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borderline significantno p-value reported

[14] showed a borderline significant reduction in ILI among study participants using P2 masks but only 21% complied with mask use.

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did not reach statistical significanceno p-value reported

Both intervention groups compared to the control showed cumulative reductions in rates of influenza over the study period, although results did not 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.