Craig J
Popul Trends. 1995 Summer(80):26-30.
More boys are born than girls, yet at older ages women far outnumber men. This article quantifies, for England and Wales, how and why this disparity in the sex ratio varies with age, and looks at changes over the course of this century. The differences between male and female mortality and migration--which lead to these imbalances in numbers--are also set out.
出生的男孩比女孩多，但在年龄较大时，女性的数量远远超过男性。本文针对英格兰和威尔士，量化了这种性别比例差异随年龄变化的方式和原因，并探讨了本世纪以来的变化情况。还阐述了导致这些数量失衡的男性和女性死亡率及迁移率之间的差异。
