The changing tide of human fertility.

Hum Reprod · 2022 · PMC8977063 · PMID 35079808

Europe PMC DOI

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may be significantno p-value reported

To address the causative mechanisms first, it may be significant that several studies have also recorded a parallel secular decline in circulating testosterone levels.

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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.