Maternal body composition in relation to twinning
AbstractMonozygotic (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
Copyright (c) 2016 Thomas Nilsen, Ragnhild Ørstavik
This work is licensed under a Creative Commons Attribution 4.0 International License.
Norsk Epidemiologi licenses all content of the journal under a Creative Commons Attribution (CC-BY) licence. This means, among other things, that anyone is free to copy and distribute the content, as long as they give proper credit to the author(s) and the journal. For further information, see Creative Commons website for human readable or lawyer readable versions.
Authors who publish with this journal agree to the following terms:
1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).