Sander Petra M, Raymond Elizabeth G, Weaver Mark A
Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, USA.
Am J Obstet Gynecol. 2009 Aug;201(2):146.e1-6. doi: 10.1016/j.ajog.2009.05.015.
The objective of the study was to examine whether emergency contraceptive use predicts future sex at risk for pregnancy, pregnancy, or sexually transmitted infection among young women.
A secondary analysis of control group participants (n = 718) from a recent trial of advanced provision of emergency contraception was conducted.
We found no association between use of emergency contraception and either pregnancy or infection. Recent use predicted decreased occurrence of subsequent sex at risk for pregnancy among women with a history of sexually transmitted infection (relative risk [RR], 0.39; 95% confidence interval [CI], 0.15-0.97), whereas ever having used predicted increased occurrence among women who either were highly effective method users (RR, 1.45; 95% CI, 1.05-2.01) or had no history of sexually transmitted infection (RR, 1.31; 95% CI, 1.04-1.65).
Information about prior emergency contraceptive use was not a useful predictor of subsequent pregnancy, infection, or sex at risk for pregnancy among these young women.
本研究的目的是检验紧急避孕药的使用是否能预测年轻女性未来发生有妊娠风险的性行为、妊娠或性传播感染的情况。
对近期一项紧急避孕药提前提供试验的对照组参与者（n = 718）进行了二次分析。
我们发现紧急避孕药的使用与妊娠或感染之间没有关联。近期使用紧急避孕药可预测有性传播感染病史的女性随后发生有妊娠风险性行为的几率降低（相对风险[RR]，0.39；95%置信区间[CI]，0.15 - 0.97），而曾经使用过紧急避孕药则可预测高效避孕方法使用者（RR，1.45；95%CI，1.05 - 2.01）或无性传播感染病史的女性中随后发生有妊娠风险性行为的几率增加（RR，1.31；95%CI，1.04 - 1.65）。
在这些年轻女性中，既往紧急避孕药使用情况并非后续妊娠、感染或有妊娠风险性行为的有效预测指标。
