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为了解三峡库区女学生月经初潮年龄，为开展青春期卫生知识教育提供科学依据。我们于1997年12月对库区内女学生月经初潮年龄进行了调查，结果分析如下。1对象与方法调查对象为万县市19所大、中、小学女学生，年龄8～24岁。在校医和班主任的协助下，组织学生以班级为单位进行问?
In order to understand the menarche age of female students in the Three Gorges Reservoir Area, it provides a scientific basis for the education of adolescent health education. We conducted a survey on the menarche age of female students in the reservoir area in December 1997. The results were analyzed as follows. 1 Subjects and Methods The survey was conducted for 19 primary, middle and primary school female students in Wanxian City and aged between 8 and 24 years old. With the help of school doctors and head teachers, organize students to ask questions in class units?