Becker S, Sosa D
Epidemiologic Intelligence Service, Centers for Disease Control, Atlanta, GA.
Stud Fam Plann. 1992 Nov-Dec;23(6 Pt 1):386-91.
Recent demographic surveys have incorporated a month-by-month calendar for the five-year reference period before the survey for the recording of fertility-related events (sexual unions, contraceptive use, pregnancies, and breastfeeding). In the 1986 survey of Maternal and Child Health and Family Planning in Costa Rica, approximately one-half of the 3,527 women interviewed were administered a questionnaire with traditional fertility and family planning questions; the other half were asked virtually the same questions, but the women's responses were entered in a month-by-month calendar. The assignment of questionnaire type was randomly alternated by cluster. Comparisons of the number of events (live births, pregnancy losses, and contraceptive use) showed that more events were recorded among the women in the calendar group. Significantly less erroneous superposition of events (contraceptive use in the last trimester of pregnancy and hormonal contraceptive use in the first month postpartum) was noted when the calendar was used.
最近的人口统计调查在调查前的五年参考期内采用了逐月日历，用于记录与生育相关的事件（性结合、避孕措施使用、怀孕和母乳喂养）。在1986年哥斯达黎加母婴健康与计划生育调查中，接受访谈的3527名女性中，约有一半填写了包含传统生育和计划生育问题的问卷；另一半被问到几乎相同的问题，但她们的回答被填入逐月日历中。问卷类型的分配按群组随机交替。对事件数量（活产、流产和避孕措施使用）的比较表明，日历组女性记录的事件更多。使用日历时，事件的错误叠加（怀孕晚期使用避孕措施和产后第一个月使用激素避孕）明显减少。
