Impact of ambient air pollution on gestational age is modified by season in Sydney, Australia.

Environ Health · 2007 · PMC1894960 · PMID 17553174

Europe PMC DOI

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borderline significantno p-value reported

There were no significant effects of O3 and a borderline significant effect of PM2.5 on preterm births.

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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.