TY - JOUR AU - Nilsen, Thomas AU - Magnus, Per AU - Ørstavik, Ragnhild PY - 2016/07/20 Y2 - 2024/03/28 TI - Maternal body composition in relation to twinning JF - Norsk Epidemiologi JA - Nor J Epidemiol VL - 26 IS - 1-2 SE - DO - 10.5324/nje.v26i1-2.2019 UR - https://www.ntnu.no/ojs/index.php/norepid/article/view/2019 SP - AB - Monozygotic (MZ) twinning is considered to be a random event whereas spontaneous dizygotic (DZ)<br />twinning is influenced by several factors. Thus, secular changes in twinning rates are usually explained by<br />changes in DZ twinning alone. Maternal body mass index (BMI) before pregnancy and maternal height are<br />believed to be significant drivers of twinning. Our aim in this study was to explore to what degree maternal<br />body composition influences twinning. Data on births and maternal height and BMI from the Medical Birth<br />Registry Norway (MBRN) was analyzed applying multivariate logistic regression analysis. The results<br />showed that increasing maternal BMI and height has a positive association with twinning. There is an<br />increased risk of DZ twinning for a maternal BMI &gt; 25, OR 1.31-1.43 and for maternal height ≥ 173 cm,<br />OR 1.28. In explaining secula ER -