Smith G G, Lee R J
Contraception. 1984 Aug;30(2):115-23. doi: 10.1016/0010-7824(84)90095-7.
A survey of cap use and efficacy of women who initially purchased a cervical cap at the University of California at Berkeley Student Health Service is described. It reports the follow-up of 65 U.C. women students who purchased either Vimule or Cavity-rim cervical caps from May, 1978 through June, 1981 and raises questions about cervical cap use and efficacy. Participants were divided into two groups: regular and irregular users. Of the 33 regular users, 16 experienced unplanned pregnancy during the study. Survival probabilities were 80% at 6 months, 73% at one year and 52% after 2 years. Life table analysis of the 33 regular users indicated a 20% probability of pregnancy in the first 6 months of use, 27% by 1 year and 48% by the end of 2 years.
本文描述了一项针对最初在加州大学伯克利分校学生健康服务中心购买宫颈帽的女性使用情况及效果的调查。报告了1978年5月至1981年6月期间购买Vimule或Cavity-rim宫颈帽的65名加州大学女生的随访情况，并对宫颈帽的使用及效果提出了疑问。参与者被分为两组：经常使用者和不经常使用者。在33名经常使用者中，有16人在研究期间意外怀孕。6个月时的生存概率为80%，1年时为73%，2年后为52%。对33名经常使用者的生命表分析表明，使用的前6个月怀孕概率为20%，1年时为27%，2年末为48%。
