Timing of spermarche and menarche among urban students in Guangzhou, China: trends from 2005 to 2012 and association with Obesity.

Sci Rep · 2018 · PMC5762656 · PMID 29321542

Europe PMC DOI

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a decreasing trendno p-value reported

showed a decreasing trend in ages at spermarche and menarche in four- or five-year intervals during 1991–2014 based on small sample size 20 .

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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.