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1 调查对象和方法1·1 对象 10所中、小学校8～19周岁健康女学生,共计3623人,其中城市1298人,农村2325人。1·2 方法 ①对每一名女学生询问有否月经及月经初潮的具体年、月、日,然后计算月经初潮的年龄。②检查第二性征。通过经省培训的专业人员采用全国统一方法及标准,测量乳房、阴毛及腋毛发育程度。2 结果与分析2·1 月经初潮 经统计计算,城市女学生初潮年龄为12.86岁,农村为13.82岁。此结果与1991年山东省城市女学生初
1 Subjects and methods 1.1 Object 10 primary and secondary schools of healthy women aged 8 to 19, a total of 3623 people, of which 1298 cities and 2325 rural areas. 1.2 Methods ① for each female student asked whether menstruation and menarche specific menarche, month, day, and then calculate the age of menarche. ② check the second character. By the provincial training of professionals using a unified national methods and standards to measure the breast, pubic hair and armpit hair development. 2 Results and Analysis 2.1 menstrual menarche According to statistics, urban girls age of 12.86 years old schoolchildren, rural areas of 13.82 years old. This result was compared with the 1991 female students in urban areas of Shandong Province