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Aim
To examine the secular trend and the urban–rural disparity of spermarche among Chinese Han boys from 1995 to 2019.
Methods
A total of 392 775 boys of Han ethnicity aged 11–18 years were extracted from the 1995, 2000, 2005, 2010, 2014 and 2019 Chinese National Surveys on Students' Constitution and Health. The median age at spermarche was estimated using the status quo data and probit analysis...
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