Global shifts in the timing of life-course events such as cohabitation, marriage, and childbearing, and declines in the desired number of children, mean that most women will spend an increasing period of their reproductive years trying to avoid pregnancy. How successfully they manage to do so is reflected in the rate of unintended pregnancies. Despite dramatic increases in the use of family planning worldwide, previous research shows that in both high-income and low-income settings a substantial proportion of pregnancies and births are unplanned or unwanted.

中文翻译：

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捕获随时间和地点意外怀孕变化的新颖方法

同居，结婚和生育等人生历程发生时间的全球变化，以及所需的孩子数量下降，这意味着大多数妇女将在生殖年期中增加尝试避免怀孕的时间。他们成功做到这一点的方式反映在意外怀孕的发生率上。尽管全球范围内使用计划生育的人数急剧增加，但先前的研究表明，在高收入和低收入环境中，绝大部分的怀孕和分娩都是计划外的或不受欢迎的。