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发身期即是性器官成熟的时期。发身期的开始,标志着身体和精神的成熟。据Shuttleworth称,女子的成熟年龄并不一致,而参差于11—15岁之间,但按生理龄而言,(生理龄指:初月经,身高的突长,及末节指骨骨骺的融合等。译者注)则皆相同。并言,在身高快速增长之后,身体的增长便接近尾声。初月经标示身体的增长将迅速减缓。研究家们都发现,濒临初月经到来之前,身体有一个突发的快速增长。其后逐渐减速,以至于完全停止。在面部增长的研究中,也得出同样的结论;初月经标志下颌快速增长之尾声。本研究之目的,在于确定下颌最大量增长的时间与初月经的关系,并观察这些成熟指标,如初月经,身高突长,和末节指骨骨骺之融合开始等,是否可以用为预测发身期
Hair period is the period of sexual maturity. The beginning of the hair period, marking the maturity of the body and spirit. According to Shuttleworth, the mature age of women is not consistent but varies between the ages of 11 and 15, but according to the age of physiology, the age of menstruation refers to the initial menstruation, the sudden growth of height, and the fusion of epiphysis of the distal phalanx. Note) are the same. And, after the rapid growth of height, the growth of the body will come to a close. The mark of the first month of the body's growth will slow rapidly. Researchers have found that there is a sudden and rapid increase in the body before the advent of the first period. Then gradually slowed down, so completely stopped. In the study of facial growth, also reached the same conclusion; the first month marked the rapid growth of the jaw of the tail. The aim of this study was to determine the relationship between the maximal increase in mandibular length and the early menstruation and to observe whether these maturing indicators such as early menstruation, hyperexcitability, and the beginning of the fusion of distal phalangeal epiphysis can be used to predict the period of onset