Correlation of body mass index levels with menarche in adolescent girls in Shaanxi, China: a cross sectional study.

BMC Womens Health · 2016 · PMC5013571 · PMID 27599475

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a decreasing trendno p-value reported

However, the age at menarche for all birth groups showed a decreasing trend, consistent with existing data for Chinese populations [ 2 – 7 ].

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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.