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为了解包头市郊区女性中小学生青春期发育的现状及发育规律,我们于1990年3～6月进行了调查。 1 调查内容及方法 1.1 调查对象:选择包头市郊区有代表性的中小学校、以7～17岁女生为调查对象,共获得有
To understand the status quo and developmental rules of pubertal development among female primary and secondary school students in the suburbs of Baotou, we conducted a survey from March to June 1990. A survey of the contents and methods 1.1 Survey: Select Baotou suburb of representative primary and secondary schools to 7 to 17-year-old girl as the survey, a total of