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为了解我市城乡女生月经初潮平均年龄及痛经情况，我们于1997年11月对城乡女学生进行了调查，现报道如下。l对象与方法1．l对象：选择城市、乡村有代表性的临沂一中、一附小、大岭乡中学、小学共4所学校的汉族7－18岁的女学生459名作为观察对象。12方法：由学校女校医采取填写
In order to understand the average age of menarche and dysmenorrhea among urban and rural girls in our city, we conducted a survey on female students in urban and rural areas in November 1997. The report is as follows. l Objects and Methods 1. l Target: Select 279 female students aged 7-18 years from the Han ethnic group in four schools in Linyi, Yifuxiao, Dalingxiang Middle School and primary schools. 12 methods: fill in by female school doctor