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The Journal of Maternal-Fetal & Neonatal Medicine Volume 34, 2021 - Issue 2
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Original Articles

Intertwin birthweight discordance and parental race: a retrospective cohort study

Yanni Xiaoa Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China; ;b McLaughlin Centre for Population Health Risk Assessment, Faculty of Medicine, University of Ottawa, Ottawa, Canada; View further author information
,
Shujuan Maa Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China; View further author information
,
Xuan Taoc Department of Dermatology, Ningxiang General Hospital, Ningxiang, China; View further author information
,
Shi Wu Wena Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China; ;d Department of Obstetrics and Gynecology, Faculty of Medicine, OMNI Research Group, University of Ottawa, Ottawa, Canada; ;e Ottawa Hospital Research Institute, Clinical Epidemiology Program, University of Ottawa, Ottawa, Canada; ;f School of Epidemiology and Public Health, Faculty of Medicine, University of Ottawa, Ottawa, Canada; ORCID Iconhttps://orcid.org/0000-0002-7227-0283View further author information
ORCID Icon,
Hongzhuan Tana Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China; View further author information
,
Wen Liug School of Educational Sciences, Hunan First Normal University, Changsha, People’s Republic of China; Correspondence[email protected]
View further author information
&
Minxue Shenh Department of Dermatology, Xiangya Hospital, Central South University, Changsha, ChinaCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0003-0441-9303View further author information
ORCID Icon show all
Pages 293-299 | Received 17 Jan 2019, Accepted 31 Mar 2019, Published online: 12 Apr 2019
 
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Abstract

Objectives: Previous studies examined the association of maternal race with pregnancy outcomes. The study aimed to examine the effects of maternal, paternal, and parental race on intertwin birth weight discordance.

Methods: We used the 2011–2015 multiple birth files of the USA for this study. The exposure variable of this study was parental race and intertwin birthweight discordance >25% was the outcome. In addition to separately analyzing maternal and paternal races, we assessed the effect of the combined race after grouping the participants into nine groups based on the race of both parents.

Results: A total of 203,872 pairs of twins were included in the final analysis. The overall incidence of intertwin birthweight discordance in this population was 7.8%. Birthweight discordance was significantly associated with maternal, paternal, and parental races. Twins born to Black parents had significant risks of developing birthweight discordance than twins born to White parents (adjusted OR = 1.11, 95% CI: 1.06–1.17 for Black mothers and Black fathers). Combined parental race showed that compared to twins born to both parents Whites, twins born to both parents Blacks had a significantly elevated risk of developing birthweight discordance (adjusted OR = 1.13, 95% CI: 1.07–1.18). No significant difference in the risk of developing birthweight discordance was found for other parental race groups, same race or different race parents.

Conclusions: Twins born to Black mothers, fathers, or both parents had significant risks of developing intertwin birthweight discordance than twins born to White mothers, fathers, or both parents.

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability

The data is available from National Vital Statistics System of Centers for Disease Control and Prevention of United States upon request (https://www.cdc.gov/nchs/nvss/index.htm).

Additional information

Funding

This work was supported by the Hunan Department of Education [14B037] and Hunan Department of Science and Technology [2018SK2086].

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