这一数字来自于本周青春期健康杂志在线版提前发表的一篇短文。
The number comes from a tiny paper published early online, this week, in the Journal of Adolescent Health.
当她在一篇杂志上读到一篇关于电蚀除瘤的的文章时她决定尝试。但是她的的医生告诉他如果她想要电蚀除瘤有效果的话，她必须等到青春期发育两年后治疗才行。
She decided to undergo electrolysis after reading a magazine article about it, but her GP told her she would have to wait until two years after puberty if she wanted it to be effective.
根据去年《儿科杂志》上的一项研究，百分之十五的美国女孩七岁就开始了青春期。
According to a study published in the journal Pediatrics last year, 15 per cent of American girls have begun puberty by age seven.
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