Richwald G A, Greenland S, Gerber M M, Potik R, Kersey L, Comas M A
Divisions of Population and Family Health, University of California, Los Angeles School of Public Health.
Obstet Gynecol. 1989 Aug;74(2):143-8.
From 1981-1988, 3433 women were fitted with a cavity-rim cervical cap in a Food and Drug Administration-approved study. The estimated first-year pregnancy risk was 11.3% (95% confidence limits 10.0-12.8), with risks of 8.3 and 3.8% for user and method failures, respectively. Women who were younger, less educated, and more sexually active, and who intended to have children in the future, had higher pregnancy risks. "Near-perfect" users, ie, individuals who wore the cap for a maximum of 72 hours, used spermicide 100% of the time, and did not report unprotected sexual intercourse, had half the first-year pregnancy risk of others (6.1 versus 11.9%). There were no serious medical or gynecologic complications associated with cap use, although over 20% of users reported problems with cap dislodgment during or after intercourse, cap malodor, or partner discomfort.
在1981年至1988年期间，3433名女性在一项经美国食品药品监督管理局批准的研究中佩戴了腔缘宫颈帽。估计第一年的怀孕风险为11.3%（95%置信区间为10.0 - 12.8），使用者失败和方法失败的风险分别为8.3%和3.8%。年龄较小、受教育程度较低、性活动较多且打算未来生育的女性怀孕风险较高。“近乎完美”的使用者，即佩戴宫颈帽最长72小时、100%使用杀精剂且未报告有未采取保护措施性行为的人，其第一年怀孕风险是其他人的一半（6.1%对11.9%）。使用宫颈帽未出现严重的医学或妇科并发症，不过超过20%的使用者报告在性交期间或之后宫颈帽移位、有异味或伴侣不适等问题。
