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为了探讨朝、汉不同民族首次遗精状况及年龄特点,作者在延吉市和龙井县,选择了学习负担、生活水平、体力活动均属中等的学校,朝族与汉族各四所(中小学各半)进行调查。 1 对象与方法 1.1 对象:选择被调查的学生其父母都必须是同一民族的7～15岁中、小学生2072人(有效卡片)。其中朝族1029人,汉族1043人。
In order to explore the first spermatorrhea status and age characteristics of different nationalities in North Korea and South Korea, the author chose Yanji City and Longjing County to study in three schools: middle school and junior high school ) To investigate. 1 Subjects and Methods 1.1 Subjects: Select the surveyed students whose parents must be the same ethnic group of 7 to 15 years of primary and secondary school students 2072 (valid card). Among them, 1029 were ethnic groups and 1043 were Han nationality.