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性成熟较早的女学生手腕骨平均骨龄明显高于她们的初潮平均时间年龄,且骨皮质发育也是提前的。发现3名已发生月经初潮的女童,未见拇指内侧种籽骨萌出。
The average age of female students with sexual maturity was significantly higher than that of their average menarche age, and the development of cortical bone was also advanced. Three girls who had had menarche were found, and no seed bones erupted on the inside of the thumb.