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Birth size and gestational age in opposite-sex twins as compared to same-sex twins: An individual-based pooled analysis of 21 cohorts

Jelenkovic, Aline, Sund, Reijo, Yokoyama, Yoshie, Hur, Yoon-Mi, Ullemar, Vilhelmina, Almqvist, Catarina, Magnusson, Patrick K. E., Willemsen, Gonneke, Bartels, Meike, van Beijsterveldt, Catharina E. M., Bogl, Leonie H., Pietiläinen, Kirsi H., Vuoksimaa, Eero, Ji, Fuling, Ning, Feng Ning, Pang, Zengchang, Nelson, Tracy L., Whitfield, Keith E., Rebato, Esther and Craig, Jeffrey M. 2018, Birth size and gestational age in opposite-sex twins as compared to same-sex twins: An individual-based pooled analysis of 21 cohorts, Scientific Reports, vol. 8, doi: 10.1038/s41598-018-24634-2.

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Title Birth size and gestational age in opposite-sex twins as compared to same-sex twins: An individual-based pooled analysis of 21 cohorts
Author(s) Jelenkovic, Aline
Sund, Reijo
Yokoyama, Yoshie
Hur, Yoon-Mi
Ullemar, Vilhelmina
Almqvist, Catarina
Magnusson, Patrick K. E.
Willemsen, Gonneke
Bartels, Meike
van Beijsterveldt, Catharina E. M.
Bogl, Leonie H.
Pietiläinen, Kirsi H.
Vuoksimaa, Eero
Ji, Fuling
Ning, Feng Ning
Pang, Zengchang
Nelson, Tracy L.
Whitfield, Keith E.
Rebato, Esther
Craig, Jeffrey M.
Journal name Scientific Reports
Volume number 8
Article ID 6300
Total pages 8
Publisher Nature Publishing Group
Place of publication London, Eng.
Publication date 2018-04-19
ISSN 2045-2322
2045-2322
Summary It is well established that boys are born heavier and longer than girls, but it remains unclear whether birth size in twins is affected by the sex of their co-twin. We conducted an individual-based pooled analysis of 21 twin cohorts in 15 countries derived from the COllaborative project of Development of Anthropometrical measures in Twins (CODATwins), including 67,850 dizygotic twin individuals. Linear regression analyses showed that boys having a co-twin sister were, on average, 31 g (95% CI 18 to 45) heavier and 0.16 cm (95% CI 0.045 to 0.274) longer than those with a co-twin brother. In girls, birth size was not associated (5 g birth weight; 95% CI −8 to −18 and −0.089 cm birth length; 95% CI −0.202 to 0.025) with the sex of the co-twin. Gestational age was slightly shorter in boy-boy pairs than in boy-girl and girl-girl pairs. When birth size was standardized by gestational age, the magnitude of the associations was attenuated in boys, particularly for birth weight. In conclusion, boys with a co-twin sister are heavier and longer at birth than those with a co-twin brother. However, these differences are modest and partly explained by a longer gestation in the presence of a co-twin sister.
Language eng
DOI 10.1038/s41598-018-24634-2
Copyright notice ©2018, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30110784

Document type: Journal Article
Collections: School of Medicine
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.