Impact of immediate postabortal insertion of intrauterine contraception on repeat abortion

Of the 1.3 million abortions performed annually in the United States, approximately half are repeat procedures. Immediate postabortal intrauterine device (IUD) insertion is a safe, effective, practical and underutilized intervention that we hypothesize will significantly decrease repeat unintended pregnancy and abortion.

All women receiving immediate postabortal IUD insertion in eight clinics of a Northern California Planned Parenthood agency during a 3-year period comprise the IUD cohort. We selected a cohort of controls receiving abortions but choosing other, non-IUD contraception on the day of the abortion visit in a 2:1 ratio matched by date of abortion. We obtained follow-up data on repeat abortions within the agency for both cohorts through 14 months after the 3-year period. We evaluated differences in repeat abortion between cohorts. All analyses were intent-to-treat.

Women who received an immediate postabortal IUD had a lower rate of repeat abortions than controls (p<.001). Women who received a postabortal IUD had 34.6 abortions per 1000 woman-years of follow-up compared to 91.3 for the control group. The hazard ratio for repeat abortion was 0.38 [95% confidence interval (CI), 0.27-0.53] for women receiving a postabortal IUD compared to controls. When adjusted for age, race/ethnicity, marital status, and family size, the hazard ratio was 0.37 (95% CI, 0.26-0.52).

Immediate postabortal intrauterine contraception has the potential to significantly reduce repeat abortion.