A Psycological Study of Sexual Development in Japanese Female

青春期是一个明显的生物，心理和社会变化的时期。本研究的主要目的是探讨生理和心理因素如何相互作用，影响女性青春期性行为的发展。本研究旨在调查日本73，309名10岁至15岁女性的性发育。月经初潮是女性性成熟开始的主要指标。日本女性的平均初潮年龄已估计probit分析从状态qeo数据。本研究于1997年2月在日本全国47个都道府县的学校中随机收集了数据。欧洲和美国的平均初潮年龄最低，为12岁零2.0个月，标准差为1岁零1.2个月。日本的性成熟提前趋势在1977 ~ 1987年停止，约为12.5年。但是日本性成熟提前的新趋势是从我们的新研究开始的。在47个县中，平均初潮年龄最低的是冲绳县的11岁11.1个月。与冲绳县相比，滋贺的月经初潮平均年龄最高，为12岁4.8个月。日本女性的发展存在地域差异。从本研究的分析来看，青春期的变化与每周吃早餐的次数、与父母交谈的频率以及自我性别认同有关。由此可见，随着青春期的变化，女性的心理和行为也发生了变化。

Puberty on early adolescence is a period of pronounced biological, psychological, and social changes. The main purpose of our study is to examine how biology and psychological factors interact to affect the development of sexuality in females' puberty. The present study aims to investigate the sexual development in japanese 73,309females, from 10years to 15years old. The menarche stands as our primary indicator of the onset of sexual maturity in females. The mean menarcheal age of japanese female has been estimate by probit analysis from status qeo data. The data have been collected at random from schools in all 47prefectures in Japan during the February in 1997. The mean menarcheal age in the total sample was the lowest on the records for Europe and the USA,it was 12year and 2.0month, with a S.D.of 1year and 1.2month.In Japan, the secular trend or accerelation to earlier sexual maturation stopped from 1977 to 1987 around the 12.5years from our past research. But the new seular trend to earlier sexual maturation in Japan began from our new research. In the 47prefetures, the most lowest mean age at menarche was 11year and 11.1month of the Okinawa prefecture. In contrast with Okinawa prefecture, the highest mean age at menarche was 12year and 4.8month of the Shiga prefecture. There were local difference in the development of japanese females. And the mean age at menarch in Japan are thought to decrease to 12.0year from now on.The pubertal change relates to times of breakfast per week, frequecies of speaking with parents, and self sexual identity from the analysis of our research. In coclusion, it can be seen that females change psychologically and behaviorally with the changes of puberty.