| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
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.
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