Office of Population Affairs, Office of the Assistant Secretary for Health, Rockville, MD.
Department of Family Science, University of Maryland, College Park, MD.
Contraception. 2018 Jul;98(1):52-55. doi: 10.1016/j.contraception.2018.02.013. Epub 2018 Mar 1.
The relationship between unintended pregnancy and interpregnancy interval (IPI) across maternal age is not clear.
Using data from the National Survey of Family Growth, we estimated the percentages of pregnancies that were unintended among IPI groups (<6, 6-11, 12-17, 18-23, 24+ months) by maternal age at last live birth (15-19, 20-24, 25-29, 30-44 years).
Approximately 40% of pregnancies were unintended and 36% followed an IPI<18 months. Within each maternal age group, the percentage of pregnancies that were unintended decreased as IPI increased.
Unintended pregnancies are associated with shorter IPI across the reproductive age spectrum.
意外妊娠与生育间隔（interpregnancy interval，IPI）之间的关系因产妇年龄而异，目前尚不清楚。
本研究使用来自国家生育调查的数据，按产妇上次活产时的年龄（15-19 岁、20-24 岁、25-29 岁、30-44 岁），估计了不同 IPI 组（<6、6-11、12-17、18-23、24+ 个月）中意外妊娠的百分比。
大约 40%的妊娠是意外妊娠，36%的妊娠紧随 IPI<18 个月。在每个产妇年龄组内，随着 IPI 的增加，意外妊娠的百分比下降。
在整个生育年龄范围内，意外妊娠与较短的 IPI 相关。
