New research at the 2015 National Abortion Federation Annual Meeting: putting research into practice

Variation in Restrictive Abortion Policies and Adverse Birth Outcomes in the United States from 2005 to 2015

BACKGROUND

Since 2011, U.S. states have enacted more than 400 policies restricting abortion access. As structural determinants, abortion policies have the potential to influence maternal and child health access, outcomes, and equity through multiple mechanisms. Limited research has examined their implications for birth outcomes.

METHODS

We created a state-level abortion restrictiveness index composed of 18 restrictive abortion policies and evaluated the association between this index and individual-level probabilities of preterm birth (PTB) and low birthweight (LBW) within the United States and by Census Region, using data from the 2005-2015 National Center for Health Statistics Period Linked Live Birth-Infant Death Files. We used logistic multivariable regression modeling, adjusting for individual- and state-level factors and state and year fixed effects.

RESULTS

Among 2,500,000 live births, 269,253 (12.0%) were PTBs and 182,960 (8.1%) were LBW. On average from 2005 to 2015, states had approximately seven restrictive abortion policies enacted, with more policies enacted in the Midwest and South. Nationally, relationships between state restrictiveness indices and adverse birth outcomes were insignificant. Regional analyses revealed that a 1-SD increase in a state's restrictiveness index was associated with a 2% increase in PTB in the Midwest (marginal effect [ME], 0.25; 95% confidence interval [CI], 0.04-0.45; p < .01), a 15% increase in LBW in the Northeast (ME, 1.24; 95% CI, 0.12-2.35; p < .05), and a 2% increase in LBW in the West (ME, 0.12; 95% CI, 0.01-0.25; p < .05).

CONCLUSION

Variation in restrictive abortion policy environments may have downstream implications for birth outcomes, and increases in abortion restrictions were associated with adverse birth outcomes in three out of four Census Regions.

Racial/ethnic and educational inequities in restrictive abortion policy variation and adverse birth outcomes in the United States

BACKGROUND

To examine racial/ethnic and educational inequities in the relationship between state-level restrictive abortion policies and adverse birth outcomes from 2005 to 2015 in the United States.

METHODS

Using a state-level abortion restrictiveness index comprised of 18 restrictive abortion policies, we conducted a retrospective longitudinal analysis examining whether race/ethnicity and education level moderated the relationship between the restrictiveness index and individual-level probabilities of preterm birth (PTB) and low birthweight (LBW). Data were obtained from the 2005-2015 National Center for Health Statistics Period Linked Live Birth-Infant Death Files and analyzed with linear probability models adjusted for individual- and state-level characteristics and state and year fixed-effects.

RESULTS

Among 2,250,000 live births, 269,253 (12.0%) were PTBs and 182,960 (8.1%) were LBW. On average, states had approximately seven restrictive abortion policies enacted from 2005 to 2015. Black individuals experienced increased probability of PTB with additional exposure to restrictive abortion policies compared to non-Black individuals. Similarly, those with less than a college degree experienced increased probability of LBW with additional exposure to restrictive abortion policies compared to college graduates. For all analyses, inequities worsened as state environments grew increasingly restrictive.

CONCLUSION

Findings demonstrate that Black individuals at all educational levels and those with fewer years of education disproportionately experienced adverse birth outcomes associated with restrictive abortion policies. Restrictive abortion policies may compound existing racial/ethnic, socioeconomic, and intersecting racial/ethnic and socioeconomic perinatal and infant health inequities.