Interbirth Intervals of Immigrant and Refugee Women in the United States: A Cross-Sectional Study.

Background and objective: Despite guidelines recommending an interval of at least 18-24 months between a live birth and the conception of the next pregnancy, nearly one-third of pregnancies in the United States are conceived within 18 months of a previous live birth. The purpose of this study was to examine the associations between multiple immigration-related variables and interbirth intervals among reproductive-aged immigrant and refugee women living in the United States.

Methods: This was a cross-sectional, quantitative study on the sexual and reproductive health (SRH) of reproductive-aged immigrant and refugee women in the United States. The data were collected via an online survey administered by Lucid LLC. We included data on women who had complete information on nativity and birth history in the descriptive analysis (n = 653). The exposure variables were immigration pathway, length of time since immigration, and country/region of birth. The outcome variable was interbirth interval (≤18, 19-35, or ≥36 months). We used multivariable ordinal logistic regression, adjusted for confounders, to determine the factors associated with having a longer interbirth interval among women with second- or higher-order births (n = 245).

Results: Approximately 37.4% of study participants had a short interbirth interval. Women who immigrated to the United States for educational (aOR = 4.57; 95% CI, 1.57-9.58) or employment opportunities (aOR = 2.27; 95% CI, 1.07-5.31) had higher odds of reporting a longer interbirth interval (19-35 or ≥36 months) than women born in the United States. Women born in an African country had 0.79 times the odds (aOR = 0.79; 95% CI, 0.02-0.98) of being in a higher category of interbirth interval.

Conclusion and global health implications: Although all birthing women should be counseled on optimal birth spacing through the use of postpartum contraception, immigrant and refugee women would benefit from further research and policy and program interventions to help them in achieving optimal birth spacing. SRH research in African immigrant and refugee communities is especially important for identifying ameliorable factors for improving birth spacing.