Reassessing the importance of long-acting contraception

Women's Use of Long-Acting Reversible Contraception for Birth Timing and Birth Stopping

The use of long-acting reversible contraceptive (LARC) methods-intrauterine devices (IUDs) and implants-has recently expanded rapidly in the United States, and these methods together approach the contraceptive pill in current prevalence. Research on LARCs has analyzed their use to reduce unintended pregnancies but not their use to enable intended pregnancies. Knowledge of both is necessary to understand LARCs' potential impacts on the reproductive life courses of U.S. women. We combine data from two nationally representative surveys to estimate women's likelihood and timing of subsequent reproductive events, including births resulting from an intended pregnancy up to nine years after discontinuing LARC use. We estimate that 62% of women will give birth, and 45% will give birth from an intended pregnancy. Additionally, 18% will have a new LARC inserted, and 13% will transition to sterilization. Most of these reproductive events occur within two years after discontinuing LARC use. Births from an intended pregnancy are especially common when no intervening switch to another contraceptive method occurs. We infer that women's motives for using LARC are varied but include the desire to postpone a birth, to postpone a decision about whether to have a(nother) birth, and to transition definitively to the completion of childbearing.

Understanding the extent of contraceptive non-use among women at risk of unintended pregnancy, National Survey of Family Growth 2011-2017

Objective

To describe characteristics of U.S. contraceptive non-users to inform tailored contraceptive access initiatives.

Study design

We used National Survey of Family Growth data from 2011 to 2017 to identify characteristics of contraceptive non-users compared to other women ages 15–44 at risk for unintended pregnancy. We also examined reasons for not using contraception by when non-users expected their next birth. We calculated unadjusted and adjusted prevalence ratios using two definitions of contraceptive non-use: (1) contraceptive non-use during the interview month, and (2) a more refined definition based on contraception use during the most recent month of sexual intercourse and expectation of timing of next birth. We considered p-values < 0.05 statistically significant.

Results

Approximately 20% (n = 2844) of 12,071 women at risk of unintended pregnancy were classified as standard contraceptive non-users. After adjusting for all other variables, non-users were more likely to be low-income, uninsured, never married, expect a birth within 2 years, and have zero or one parity. The top reasons for contraceptive non-use were not minding if they got pregnant (22.6%), worried about contraceptive side effects (21.0%), and not thinking they could get pregnant (17.6%). After applying the more refined non-user definition, we identified 5.7% (n = 721) of women as non-users; expecting a birth within 2–5 years and having a parity of one were associated with non-use after adjustment of all other factors.

Conclusion

Our more refined definition of non-users could be used in future studies examining the causes of unintended pregnancy and to inform programmatic interventions to reduce unintended pregnancy.

Implications

Describing contraceptive non-users and reasons for contraceptive non-use could help us better understand reasons for unintended pregnancy and inform tailored contraceptive access initiatives.

Patterns and trends in contraceptive use among women attending Title X clinics and a national sample of low-income women

Objectives

To describe the types of contraception used by women attending Title X-funded clinics and a comparable group of low-income reproductive-age women at risk of unintended pregnancy.

Study design

We estimated the percentage of reproductive aged (15-44 years) women using contraception, by method type and level of effectiveness in preventing pregnancy (i.e., most, moderately, and less effective), using Title X Family Planning Annual Report (2006-2016) and National Survey of Family Growth (2006-2015) data. We divided most effective methods into permanent (female and male sterilization) and reversible (long-acting reversible contraceptives [LARCs]) methods.

Results

Among Title X clients during 2006-2016, use of LARCs increased (3-14%); use of moderately effective methods decreased (64-54%); and use of sterilization (~ 2%), less effective methods (21-20%), and no method (8-7%) was unchanged. These same trends in contraceptive use were observed in a comparable group of women nationally during 2006-2015, during which LARC use increased (5-19%, p < .001); moderately effective method use decreased (60-48%, p < .001); and use of sterilization (~5%), less effective methods (19%), and no method (11-10%) was unchanged.

Conclusions

The contraceptive method mix among Title X clients differs from that of low-income women at risk of unintended pregnancy nationally, but general patterns and trends are similar in the two populations. Research is needed to understand whether method use patterns among low-income women reflect their preferences, access, or the conditions of the supply environment.

Implications

This study contributes to our understanding of patterns and trends in contraceptive use among two groups of reproductive-age women - Title X clients and low-income women nationally who are at risk of unintended pregnancy. The findings highlight areas for further research.

A prospective measure of unintended pregnancy in the United States

OBJECTIVE

To describe a new measure, the unintended pregnancy risk index (UPRI), which is based primarily on attitudinal and behavioral measures of women's prospective pregnancy desire, and compare it to the unintended pregnancy rate, typically calculated retrospectively.

STUDY DESIGN

We used three rounds of the National Survey of Family Growth to calculate trends in the UPRI and compare it to the retrospective rate. The UPRI estimates the annual risk of becoming unintentionally pregnant on a scale from 0 to 100. It is based on women's prospective pregnancy desire as well as fecundity, sexual activity and contraceptive use patterns.

RESULTS

Among all women aged 15-34, the UPRI ranged from 7.4 in 2002 to 5.7 in 2013. The retrospective unintended pregnancy rate had similar levels and declines for the same overall period, although the UPRI declined earlier than the retrospective rate.

CONCLUSIONS

Changes in the use of any contraceptive method, the methods used and the effectiveness of the methods used all contributed to the decline in the UPRI.

IMPLICATIONS

The sufficiency of retrospective measures of pregnancy intention has been challenged, and data availability has constrained needed surveillance of the unintended pregnancy rate. The UPRI offers a new measure that can be calculated with existing national surveillance data or for any population for which data on prospective pregnancy desire, pregnancy risk and contraceptive use are available.