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月经初潮是青春期开始的重要标志。各种内外因素影响着初潮的迟早。近几年来，经多方报道，拉萨市藏族女生月经初潮提前，因而我们于95年5—7月间再次对拉萨部分中小学9—18周岁世居藏族女生，以随机抽样的方式，逐个登记建卡，运用月经初潮半数年龄概率单位回归法，算出月经初潮平均年龄，它将为搞好妇女保健，防止妇女疾病，开展计划生育以及妇产科学研究有着重要意义。
Menarche is an important indicator of the beginning of adolescence. Various internal and external factors affect the early menarche sooner or later. In recent years, after many reports, Tibetan women in Lhasa earlier lead to menstrual cramps, so we again in May-July 95 in Lhasa some primary and secondary schools 9-18 years old Tibetan girls, a random sample of ways, one by one registration Card, the use of half the age of menarche menstrual probability unit regression method to calculate the average age of menarche, it will do a good job in women’s health, prevent women’s disease, family planning and obstetrics and gynecology research is of great significance.