Klaus H, Goebel J M, Muraski B, Egizio M T, Weitzel D, Taylor R S, Fagan M U, Ek K, Hobday K
Contraception. 1979 Jun;19(6):613-29. doi: 10.1016/0010-7824(79)90008-8.
Use-effectiveness of the Billings Ovulation Method (OM) is reported for 1139 clients from six centers who were followed for at least 24 months. Method failure rates were 1% when calculated by either Pearl formula or life table analysis. Combined method and user failure rates were 20% when calculated with the Pearl formula, and 16% at 12 months and 23% at 24 months by life table analysis. Pregnancy rates were higher for couples using OM alone, than for couples using OM in combination with additional fertility awareness methods or together with barrier methods. The difference was significant when estimated by the Pearl formula but not when analyzed by the life table. The emotional implications underlying the apparent contradiction between a desire to avoid pregnancy and the deliberate coital use of fertile days are reflected in the differences between method and user failure rates, the high client satisfaction levels reported with "user failure," and 56% continuation rate at 24 months. The will require in-depth exploration.
报告了来自六个中心的1139名客户使用比林斯排卵法（OM）的使用效果，这些客户至少随访了24个月。通过Pearl公式或生命表分析计算，方法失败率为1%。用Pearl公式计算时，方法和使用者综合失败率为20%；通过生命表分析，12个月时为16%，24个月时为23%。单独使用OM的夫妇的妊娠率高于将OM与其他生育意识方法或屏障方法联合使用的夫妇。用Pearl公式估算时差异显著，但用生命表分析时差异不显著。避免怀孕的愿望与在易受孕期故意性交之间明显矛盾背后的情感影响，体现在方法和使用者失败率的差异、报告的“使用者失败”时较高的客户满意度水平以及24个月时56%的持续率中。这需要深入探讨。
