Bongaarts J
Stud Fam Plann. 1984 Jan-Feb;15(1):14-9.
Couples in developed societies are often unsuccessful in achieving precise family building goals despite the widespread use of birth control. Unplanned events that frustrate reproductive intentions to varying degrees include contraceptive failure, sterility, miscarriage, prolonged conception delay, undesired sex combination of offspring, divorce, and the death of a spouse or a child. This paper reviews the probability of the occurrence of these events using US data. It is concluded that the large majority of newlyweds will experience at least one unplanned event during the family building phase of the life cycle.
尽管避孕措施广泛使用，但发达社会中的夫妻在实现精确的生育目标方面往往并不成功。在不同程度上挫败生育意愿的意外事件包括避孕失败、不育、流产、受孕延迟过长、子女性别组合不理想、离婚以及配偶或子女死亡。本文利用美国的数据回顾了这些事件发生的概率。得出的结论是，绝大多数新婚夫妇在生命周期的生育阶段将经历至少一次意外事件。
