Results The mean age of the girls was 16.21±0.82 years; their menarche age was 12.67±1.21 years.
结果 受调查女生平均年龄为(16.21±0.82)岁，平均初潮年龄为(12.67±1.21)岁。
参考来源 - 上海市高中女生月经病相关症状流行特征—《中国学校卫生》—2007年第5期—龙源期刊网From this study the results can be seen in the early age at menarche is a risk factor of BC,and will reduce the risk with age growth.
从本次研究中的结果可以看出初潮年龄早是乳腺癌的危险性因素,并随着年龄的增长危险性减低。 与以往国内外的文献报道基本一致。
参考来源 - 沈阳地区女性月经史与乳腺癌发生的相关性分析·2,447,543篇论文数据，部分数据来源于NoteExpress
男性吸烟、女性初潮年龄对骨密度有一定的影响。
Smoking in male and age of menarche in female influenced BMD.
城市女性初潮年龄以15岁为最多，农村妇女以16岁为最多。
Urban women in age at menarche to a maximum of 15 years, rural women to 16 years of age the most.
结论女孩初潮年龄不仅与遗传因素有关，而且与宫内环境和儿童时期的发育有关。
Conclusion: Not only the genetic factors but also the uterine environment and the development in childhood are related to the age at menarche.
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