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青少年月经初潮和首次遗精的年龄早晚与诸如种族、健康状况、营养水平、环境等许多因素有关。为了解宁夏回、汉族学生性发育状况，掌握初潮与首遗规律，指导青春期保健工作，我们对宁夏回族自治区的8个市县的回、汉族学生进行了调查。1对象与方法1．1对象：采取分层随机整群抽
The age of menarche and first spermatorrhea is related to many factors such as race, health status, nutrition level, environment and so on. In order to understand the sexual development of Hui and Han students in Ningxia, master the first menarche and the first rule, and guide the adolescent health care work, we investigated the Hui and Han students in 8 cities and counties of Ningxia Hui Autonomous Region. 1 objects and methods 1.1 object: take stratified random cluster pumping