Short-term effects of fine particulate matter and ozone on the cardiac conduction system in patients undergoing cardiac catheterization.

Part Fibre Toxicol · 2018 · PMC6180522 · PMID 30305173

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marginally significantno p-value reported

Positive associations with the QRS interval were significant for O 3 at lag4 and marginally significant for PM 2.5 at lag1 and lag4.

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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.