抄録
It has been established a system to evaluate delayed menarche by deriving the delay in menarche from the interval between age at MPV of height and age at menarche, while at the same time establishing judgments from regression evaluations of age at menarche against age at MPV of height. In this study, the system developed to evaluate delays in menarche was applied to the age at menarche of girls in the South Korea, and we then investigated regional differences in delays and early in menarche between these two regions. The subjects were 209 girls from the Tokai region in Japan and 345 girls from the Pusan region in South Korea who underwent almost no sports training around the time of menarche. Longitudinal growth data on the girls’ height were obtained from health records from the first year of elementary school until the final (third) year of high school. The age at menarche was obtained from a questionnaire survey of the 209 girls in the Tokai region and 345 girls in the Pusan region. The delayed menarche evaluation system was applied to the age at menarche of girls from Japan and South Korea, and the average delay in menarche in South Korea region was estimated from the interval between age at MPV of height and age at menarche. Regression evaluation of age at menarche against age at MPV of height was used to clarify the somewhat early in menarche for individual girls in South Korea. It was shown that the proportion of girls with somewhat early menarche was significantly higher in South Korea than in Japan. This was inferred to be from the effect of stress from living conditions (especially lack of sleeping time) that results from the educational environment in the South Korea.
