Air change rates and interzonal flows in residences, and the need for multi-zone models for exposure and health analyses.

Int J Environ Res Public Health · 2012 · PMC3546781 · PMID 23235286

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marginally significantno p-value reported

Homes with filters showed smaller and marginally significant seasonal changes.

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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.