The role of maternal age on the risk of preterm birth among singletons and multiples: a retrospective cohort study in Lombardy, Norther Italy.

BMC Pregnancy Childbirth · 2022 · PMC8941739 · PMID 35317757

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a decreasing trendno p-value reported

For example, regarding smoking that is a major risk factor for PTB, it has been reported a decreasing trend in smoking among women of reproductive age ( https://www.istat.it/ ).

also in 47,180 other papers

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.