Abstract：
: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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Jelenkovic A,Sund R,Yokoyama Y,Hur YM,Ullemar V,Almqvist C,Magnusson PK,Willemsen G,Bartels M,Beijsterveldt CEV,Bogl LH,Pietiläinen KH,Vuoksimaa E,Ji F,Ning F,Pang Z,Nelson TL,Whitfield KE,Rebato E,Llewellyn CH,Fidoi
10.1038/s41598-018-24634-2subject
Has Abstractpub_date
2018-04-19 00:00:00pages
6300issue
1issn
2045-2322pii
10.1038/s41598-018-24634-2journal_volume
8pub_type
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