Advanced maternal age and adverse pregnancy outcome: evidence from a large contemporary cohort.

PLoS One · 2013 · PMC3577849 · PMID 23437176

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highly significantno p-value reported

We also found an incremental and highly significant increase in the rate of both elective and emergency Caesarean delivery in women aged 30 years and more when compared to women aged 20–29 years.

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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.