Secular trends for age at spermarche among Chinese boys from 11 ethnic minorities, 1995-2010: a multiple cross-sectional study.

BMJ Open · 2016 · PMC4769404 · PMID 26911588

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a decreasing trendno p-value reported

Some minority groups, such as Hui, Kirghiz, Hani and Qiang showed a clearly declining trend over time, while some minority groups, such as Zhuang, Naxi (Nakhi), Dongxiang, Li and Tu showed a decreasing trend with upward fluctuations over time, while Yao and Dong showed a relatively flat trend with no statistically significant difference between 1995 and 2010 ( figure 3 ).

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