Presser H B
Fam Plann Perspect. 1977 May-Jun;9(3):111-5.
Only one-third of urban mothers interviewed twice, a year apart, answered correctly both times about when during the menstrual cycle a woman is most likely to become pregnant. Classroom discussions about contraception, attendance at family planning clinics, and discussions with one's mother about contraception are not positively associated with knowledge about pregnancy risk. Those using methods other than the pill or IUD are more knowledgeable about pregnancy risk--perhaps because they have a greater need to know.
在接受访谈的城市母亲中，一年后再次接受访谈的人里，只有三分之一的人两次都正确回答出女性在月经周期的什么时候最有可能怀孕。关于避孕的课堂讨论、去计划生育诊所就诊以及与母亲讨论避孕，与怀孕风险知识并没有正相关关系。使用避孕药或宫内节育器以外方法的人对怀孕风险了解得更多——也许是因为他们更有了解的需求。
