Abstract
The Hispanic Paradox in birth outcomes is well documented for the US as a whole, but little work has considered geographic variation underlying the national pattern. This inquiry is important given the rapid growth of the Hispanic population and its geographic dispersion. Using birth records data from 2014 through 2016, we document state variation in birthweight differentials between US-born white women and the three Hispanic populations with the largest numbers of births: US-born Mexican women, foreign-born Mexican women, and foreign-born Central and South American women. Our analyses reveal substantial geographic variation in Hispanic immigrant–white low-birthweight disparities. For example, Hispanic immigrants in Southeastern states and in some states from other regions have reduced risk of low birthweight relative to whites, consistent with a “Hispanic Paradox.” A significant portion of Hispanic immigrants’ birthweight advantage in these states is explained by lower rates of smoking relative to whites. However, Hispanic immigrants have higher rates of low birthweight in California and several other Western states. The different state patterns are largely driven by geographic variation in smoking among whites, rather than geographic differences in Hispanic immigrants’ birthweights. In contrast, US-born Mexicans generally have similar or slightly higher odds of low birthweight than whites across the US. Overall, we show that the Hispanic Paradox in birthweight varies quite dramatically by state, driven by geographic variation in low birthweight among whites associated with white smoking disparities across states.
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Notes
California and Arizona enacted rigorous policies against smoking in the 1990s (Siegel 2002). For example, smoke free workplaces in California have been shown to reduce smoking rates and the effects of secondhand smoke (Fichtenberg and Glantz 2002; Moskowitz et al. 2000). Media campaigns against smoking in both states have also had considerable success (Levy et al. 2004).
We use the concept of “adequacy” of prenatal care based on Kotelchuck’s work (1994).
Most states excluded have structurally missing data, such as Georgia and New Jersey, were missing data on smoking.
We observed minor variation in missingness by state. Missingness is most common in California (3.6%) and Massachusetts (3.0%), and least common in Nebraska (0.1%) and Iowa (0.1%). We found no clear ethnic pattern of missingness in California. US-born whites are most commonly missing information (5.5%); US-born Mexicans (1.6%), foreign-born Mexicans (2.8%), and Central and South Americans (4.5%) have lower rates of missingness.
We include missing information as inadequate to account for missing cases in accordance with Kotelchuck’s original index (1994). We found that classifying missing in this manner did not substantially change the results from using listwise deletion or multiple imputation. Percentage of missing cases does not substantively vary by ethnicity. Cases missing information have similar risk of low birthweight to cases in the inadequate care category with complete information in prenatal care.
We observed a divergent pattern in California, in which controlling for sociodemographic differences leads to increased odds of low birthweight for Hispanic groups relative to whites. We found that this pattern is robust to different methods and years of data.
We also ran bivariate logit models, stratified by ethnicity–nativity. These models observed similar patterns. In many instances, relationships observed were stronger in the adjusted models. This supplemental analysis demonstrates that geographic variation in the observed sociodemographic characteristics does not drive the patterns observed in this paper.
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Acknowledgements
We thank the Eunice Kennedy Shriver National Institute of Child Health and Human Development NICHD-funded P2C (HD050924) for general support; the NICHD-funded [T32] (HD007168) for training support; and the National Center for Health Statistics (NCHS) for making the birth cohort files available. The content of this manuscript is the sole responsibility of the authors and does not necessarily represent the official views of NICHD or NCHS.
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Fishman, S.H., Morgan, S.P. & Hummer, R.A. Smoking and Variation in the Hispanic Paradox: A Comparison of Low Birthweight Across 33 US States. Popul Res Policy Rev 37, 795–824 (2018). https://doi.org/10.1007/s11113-018-9487-z
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DOI: https://doi.org/10.1007/s11113-018-9487-z