Westoff C F, Jones E F
Fam Plann Perspect. 1977 Jul-Aug;9(4):153-7.
Although the pill remains the most popular method of contraception among young married women, sterilization is now the method of choice among couples married a decade or more, as well as among couples who have had all the children they want. Indeed, contraceptive and medical sterilizations combined now comprise the most frequent barrier to conception among all married couples of reproductive age. Three-quarters of couples using contraception now use the most effective methods, the pill, sterilization or the IUD, and the trend data suggest a continuing increase in the reliance on such methods.
尽管避孕药仍然是年轻已婚女性中最受欢迎的避孕方法，但绝育现在是结婚十年或更长时间的夫妇以及已经育有所有想要孩子的夫妇的首选方法。事实上，避孕和医学绝育现在共同构成了所有育龄已婚夫妇中最常见的受孕障碍。现在，四分之三使用避孕措施的夫妇采用了最有效的方法，即避孕药、绝育或宫内节育器，趋势数据表明对这些方法的依赖在持续增加。
