Maternal body composition in relation to twinning

Thomas Nilsen, Per Magnus, Ragnhild Ørstavik

Abstract


Monozygotic (MZ) twinning is considered to be a random event whereas spontaneous dizygotic (DZ)
twinning is influenced by several factors. Thus, secular changes in twinning rates are usually explained by
changes in DZ twinning alone. Maternal body mass index (BMI) before pregnancy and maternal height are
believed to be significant drivers of twinning. Our aim in this study was to explore to what degree maternal
body composition influences twinning. Data on births and maternal height and BMI from the Medical Birth
Registry Norway (MBRN) was analyzed applying multivariate logistic regression analysis. The results
showed that increasing maternal BMI and height has a positive association with twinning. There is an
increased risk of DZ twinning for a maternal BMI > 25, OR 1.31-1.43 and for maternal height ≥ 173 cm,
OR 1.28. In explaining secula

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DOI: http://dx.doi.org/10.5324/nje.v26i1-2.2019

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