青春期发育的最突出变化，除了生长突增以外，就是性发育的发展。 儿童期生殖器的发育很缓慢，处于幼稚状态，进入青春期，在内分泌的影响下，内、外生殖器官迅速发育。与身体其他系统相比，生殖系统在相对较短的时间内发育成熟，出现了显著的性别特征。 性发育包括生殖器官的形态发育、功能发育和第二性征的发育。
By inducting sex development into the regression of height increase and weight increase on years, similar to the covariance analysis, we have departecd the effects of age and sex development on increase of height increase and weight increase each other.
用类似于协方差分析的方法将性发育水平引入回归方程，因而量化地刻划了年龄及性发育对身高及体重增长的影响。
参考来源 - 男性性发育水平与身高体重关系的数理研究Conclusion Closed association is found between the percentage of body fat and girls’ sexual development, especially that ofmenarche age. It’s important to control the occurrence of overweight and obesity in puberty for females’ health.
结论 体脂肪变化与性发育(尤其初潮年龄)早晚密切相关；青春期控制超重、肥胖发生对女性健康至关重要。
参考来源 - 中小学女生超重肥胖与月经初潮的关系—《中国学校卫生》—2010年第11期—龙源期刊网·2,447,543篇论文数据，部分数据来源于NoteExpress
流行病学研究发现，广泛性发育障碍（Pervasive Developmental Disorder）孩子和正常孩子相比较并没有更高的胃肠道患病率。
Epidemiological studies have found that children with PDD have no higher prevalence of gastrointestinal tract than normal children.
目的了解中国北方健康女性青少年青春期性发育过程。
Objective To investigate the process of puberty development of healthy adolescent girls in Northern China.
可能白人女孩还没有触到生物学上性发育的最小年龄，”他说。
Maybe white populations have not arrived at that biologic minimum," he says.
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