This study, in order to assess delayed menarche in Korean girls, sought a valid regression evaluation judgment from a regression diagram of age at menarche against maximum peak velocity (MPV) of height during puberty. The subjects were 391 Korean girls for whom longitudinal data were obtained from the first year of elementary school (7 years of age) to the second year of high school (17 years of age). In addition, age at menarche was obtained from a questionnaire survey, and precise age at menarche was calculated from date of birth. The wavelet interpolation method was applied to the obtained longitudinal growth distance, and the age at maximum peak velocity in height was derived. The normality of the age at MPV of height, age at menarche, and interval between age at MPV of height and menarche were analyzed, and the effectiveness of those statistical values was confirmed. In addition, a regression analysis was conducted for the interval in both traits and age at MPV of height, and it was demonstrated that the size of the interval tends to decrease from early to normal and late maturation. From this finding, one may consider preparation of an assessment chart by level of maturation when structuring a delayed menarche judgment. However, the regression tendency in age at menarche against age at MPV of height in the respective maturation bands was not seen to be effective at all in the early maturation band, and considering simplification of the evaluation system it would be valid to construct a uniform evaluation judgment system rather than an evaluation system by level of maturity. We then attempted a quadratic or greater regression polynomial analysis in a regression analysis of age at menarche against age at MPV of height, and the quadratic regression polynomial was found to be effective. In constructing a delayed menarche evaluation system for Korean girls, a quadratic regression polynomial evaluation of age at menarche against age at MPV of height may be proposed.
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