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Relations between neighbourhood socioeconomic status and birth outcomes are mediated by maternal weight

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  • Clayborne, Zahra M.
  • Giesbrecht, Gerald F.
  • Bell, Rhonda C.
  • Tomfohr-Madsen, Lianne M.

Abstract

Lower neighbourhood-level socioeconomic status (SES) has been repeatedly associated with an increased risk of adverse birth outcomes, even after controlling for individual-level SES. Few studies have empirically assessed potential mechanisms underlying the associations. The objectives of this study were to (1) examine relations between neighbourhood SES and birth outcomes, and (2) explore if maternal weight variables mediated these relations. Data came from a provincial prospective pregnancy cohort study in Canada. Census data was used to create a continuous measure of neighbourhood SES. Using information from maternal questionnaires and medical records, two mediators (pre-pregnancy body mass index (BMI), and gestational weight gain (GWG)) and five birth outcomes (preterm birth, low birth weight, macrosomia, small for gestational age (SGA), large for gestational age (LGA)) were examined. After adjusting for individual-level covariates, mediation analyses supported significant associations between lower neighbourhood SES and increased risk of macrosomia (b = 0.1183, 95% BCa CI: 0.0607–0.1896) and LGA (b = 0.0565, 95% BCa CI: 0.0040–0.1186) through higher pre-pregnancy BMI. Significant associations were also observed between neighbourhood SES and macrosomia, LGA, and preterm birth (b = 0.0105, 95% BCa CI: 0.0014–0.0246) through pre-pregnancy BMI and GWG in tandem; pairwise comparisons suggested that associations with macrosomia and LGA through pre-pregnancy BMI alone were significant over associations through pre-pregnancy BMI and GWG together. These findings add to a growing body of literature assessing potential mechanisms underlying relations between neighbourhood SES and adverse birth outcomes, and suggest that neighbourhood-level SES may influence birth outcomes through maternal weight.

Suggested Citation

  • Clayborne, Zahra M. & Giesbrecht, Gerald F. & Bell, Rhonda C. & Tomfohr-Madsen, Lianne M., 2017. "Relations between neighbourhood socioeconomic status and birth outcomes are mediated by maternal weight," Social Science & Medicine, Elsevier, vol. 175(C), pages 143-151.
    • Handle: RePEc:eee:socmed:v:175:y:2017:i:c:p:143-151
    DOI: 10.1016/j.socscimed.2016.12.041
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    References listed on IDEAS

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    1. O'Campo, P. & Xue, X. & Wang, M.-C. & Brien Caughy, M.O., 1997. "Neighborhood risk factors for low birthweight in Baltimore: A multilevel analysis," American Journal of Public Health, American Public Health Association, vol. 87(7), pages 1113-1118.
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    3. Schempf, Ashley & Strobino, Donna & O'Campo, Patricia, 2009. "Neighborhood effects on birthweight: An exploration of psychosocial and behavioral pathways in Baltimore, 1995-1996," Social Science & Medicine, Elsevier, vol. 68(1), pages 100-110, January.
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    3. Thorsen, Maggie L. & Thorsen, Andreas & McGarvey, Ronald, 2019. "Operational efficiency, patient composition and regional context of U.S. health centers: Associations with access to early prenatal care and low birth weight," Social Science & Medicine, Elsevier, vol. 226(C), pages 143-152.

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