• Birth size after embryo cryopreservation: larger by all measures? 

      Landsverk, Eirik; Westvik-Johari, Kjersti; Romundstad, Liv Bente Bergem; Opdahl, Signe (Peer reviewed; Journal article, 2023)
      STUDY QUESTION Are the changes in birthweight after frozen and fresh embryo transfer associated with corresponding changes in other measures of foetal growth and placental efficiency? SUMMARY ANSWER Although placental ...
    • Body mass index and subfertility: multivariable regression and Mendelian randomization analyses in the Norwegian Mother, Father and Child Cohort Study 

      Hernaez Camba, Alvaro; Rogne, Tormod; Skåra, Karoline Hansen; Håberg, Siri Eldevik; Page, Christian Magnus; Fraser, Abigail; Burgess, Stephen; Lawlor, Deborah A.; Magnus, Maria Christine (Peer reviewed; Journal article, 2021)
      STUDY QUESTION What is the association between BMI and subfertility? SUMMARY ANSWER We observed a J-shaped relationship between BMI and subfertility in both sexes, when using both a standard multivariable regression ...
    • Growth in children conceived by ART 

      Magnus, Maria Christine; Wilcox, Allen J.; Fadum, Elin Anita; Gjessing, Håkon; Opdahl, Signe; Juliusson, Petur Benedikt; Romundstad, Liv Bente; Håberg, Siri Eldevik (Peer reviewed; Journal article, 2021)
      STUDY QUESTION: Is the growth pattern of children conceived by ART different compared to naturally conceived children. SUMMARY ANSWER: Both ART and underlying parental subfertility may contribute to differences in early ...
    • Puberty disorders among ART-conceived singletons: a Nordic register study from the CoNARTaS group 

      Klemetti, R.; Perry, B.; Henningsen, A K Aaris; Spangmose, A Lærke; Pinborg, A.; Opdahl, Signe; Romundstad, Liv Bente Bergem; Bergh, C.; Wennerholm, U.B.; Tiitinen, A.; Gissler, M. (Peer reviewed; Journal article, 2022)
      STUDY QUESTION Do ART-conceived children have an increased risk for puberty disorders? SUMMARY ANSWER Both ART-conceived boys and girls had a higher risk of puberty disorders; early puberty was more common among girls ...
    • Vanishing twin syndrome among ART singletons and pregnancy outcomes 

      Magnus, Maria Christine; Ghaderi, Sara; Morken, Nils-Halvdan; Magnus, Per; Romundstad, Liv Bente Bergem; Skjaerven, Rolv; Wilcox, Allen J; Håberg, Siri Eldevik (Journal article; Peer reviewed, 2017)
      STUDY QUESTION Among babies born by ART, do singleton survivors of a vanishing twin have lower birth weight than other singletons? SUMMARY ANSWER Vanishing twin syndrome (VTS) was associated with lower birth weight among ...