Family socioeconomic position and abnormal birth weight: evidence from a Chinese birth cohort
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Birth weight is a strong determinant of infant short- and long-term health outcomes. Family socioeconomic position (SEP) is usually positively associated with birth weight. Whether this association extends to abnormal birth weight or there exists potential mediator is unclear.
We analyzed data from 14,984 mother-infant dyads from the Born in Guangzhou Cohort Study. We used multivariable logistic regression to assess the associations of a composite family SEP score quartile with macrosomia and low birth weight (LBW), and examined the potential mediation effect of maternal pre-pregnancy body mass index (BMI) using causal mediation analysis.
The prevalence of macrosomia and LBW was 2.62% (n = 392) and 4.26% (n = 638). Higher family SEP was associated with a higher risk of macrosomia (OR 1.30, 95% CI 0.93–1.82; OR 1.53, 95% CI 1.11–2.11; and OR 1.59, 95% CI 1.15–2.20 for the 2nd, 3rd, and 4th SEP quartile respectively) and a lower risk of LBW (OR 0.69, 95% CI 0.55–0.86; OR 0.76, 95% CI 0.61–0.94; and OR 0.61, 95% CI 0.48–0.77 for the 2nd, 3rd, and 4th SEP quartile respectively), compared to the 1st SEP quartile. We found that pre-pregnancy BMI did not mediate the associations of SEP with macrosomia and LBW.
Socioeconomic disparities in fetal macrosomia and LBW exist in Southern China. Whether the results can be applied to other populations should be further investigated.
KeywordsBirth cohort Low birth weight Macrosomia Socioeconomic position
We are grateful to all the mothers and their families who have participated in BIGCS and all obstetric care providers who assisted in the implementation of the study. We also wish to thank Allison Gaines from University of Oxford for polishing the language of the paper.
XQ and HX conceived and designed the ongoing cohort study. ST, SS, DW, and ML collected the data. ST, AW, JL, and JH designed the statistical analysis in this paper. ST drafted and revised the manuscript. AW, MT, JH, and SLAY provided the technical and analysis advice and revised the manuscript. XQ supervised and provide specialist support for the manuscript. ST and AW contributed equally to this paper. All authors revised the important intellectual content critically and approved the final version.
This work was supported by National Natural Science Foundation of China (Grant Numbers 81673181, 81703244, and 81803251).
Compliance with ethical standards
The Born in Guangzhou Cohort Study was reviewed and approved by the Institutional Ethics Committee of the Guangzhou Women and Children’s Medical Center.
Conflict of interest
No financial or nonfinancial benefits have been received or will be received from any party related directly or indirectly to the subject of this article.
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