Advancing New Standards in Reproductive Health (ANSIRH), Bixby Center for Global Reproductive Health, University of California, San Francisco, CA 94612, USA.
Contraception. 2012 Jan;85(1):56-62. doi: 10.1016/j.contraception.2011.05.009. Epub 2011 Jun 30.
We examined 12-month hormonal contraceptive continuation and pregnancy rates by abortion history.
Women who wanted to avoid pregnancy for at least 1 year were recruited at four San Francisco Bay area family planning clinics on regular service days and on abortion care days. Participants completed baseline and follow-up questionnaires. Multivariable Cox models assessed the factors associated with method discontinuation and pregnancy.
Women who were enrolled into the study on the day of their abortion were 20% more likely to discontinue their contraceptive method than women who never had an abortion [adjusted hazard ratio (AHR)=1.21, 95% confidence interval (CI)=1.03-1.42]. Women who had a recent abortion or previous abortion were 60% more likely to have a pregnancy during follow-up than women who never had an abortion (AHR=1.63, 95% CI =1.21-2.20, and AHR=1.66, 95% CI=1.18-2.33, respectively).
The experience of having an unintended pregnancy and abortion does not lead to behavioral changes that protect against another unintended pregnancy.
我们根据堕胎史研究了 12 个月激素避孕续用率和妊娠率。
在旧金山湾区的四家计划生育诊所的常规服务日和堕胎护理日，招募了希望至少避孕 1 年的女性。参与者完成了基线和随访问卷。多变量 Cox 模型评估了与方法中断和妊娠相关的因素。
与从未堕胎的女性相比，在堕胎当天入组研究的女性更有可能停止使用避孕方法[调整后的危险比 (AHR)=1.21，95%置信区间 (CI)=1.03-1.42]。近期堕胎或以往堕胎的女性在随访期间怀孕的可能性比从未堕胎的女性高 60%（AHR=1.63，95%CI=1.21-2.20，AHR=1.66，95%CI=1.18-2.33）。
意外怀孕和堕胎的经历并没有导致保护自己免受再次意外怀孕的行为改变。
