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以1995年广东省7～18岁城乡共15840名学生生长发育调查资料的分析为基础，结合1991、1985、1979、1963、1952年调查结果，对各年代的青春期发育开始年龄、身高最大增长年龄与增长幅度、男女生长曲线交叉年龄和交叉时的均值、平均月经初潮增次遗精年龄及青春发育后期开始年龄等的研究得出：我省学生青春期发育存在着逐步提前的长期趋势。这一趋势表现在学生青春发育开始年龄、月经初潮／首次遗精平均年龄、青春发育后期开始年龄的提前。学生青春发育的提前，使学生健康教育中有关性卫生知识的教学安排出现滞后现象。性卫生知识课，应安排在女生发生月经初潮前（小学四年级）讲授。
Based on the survey data of 15,840 students in urban and rural areas aged 7-18 in Guangdong Province in 1995 and the survey results of 1991, 1985, 1979, 1963 and 1952, the age of onset of adolescence, the maximum age of height growth And growth rate, male and female growth curve crossing age and mean cross, the average increase of menstrual nocturnal emission sperm age and the starting age of puberty and other studies have shown: There is a gradual advance in the long-term trend of adolescent students in our province. This trend is reflected in the beginning age of students puberty, menarche / mean age of first spermatorrhea, adolescent early onset of early age. The advancement of students ’puberty makes the teaching arrangement of sexual health knowledge in students’ health education lagged. Sexual health classes should be arranged prior to the onset of menarche (Primary 4).