Blar i Bergen Open Research Archive på forfatter "Morken, Nils-Halvdan"
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Assfociations of perfluoroalkyl substances (PFAS) with lower birth weight: An evaluation of potential confounding by glomerular filtration rate using a physiologically based pharmacokinetic model (PBPK)
Verner, Marc-André; Loccisano, Anne E.; Morken, Nils-Halvdan; Yoon, Miyoung; Wu, Huali; McDougall, Robin; Maisonet, Mildred; Marcus, Michele; Kishi, Reiko; Miyashita, Chihiro; Chen, Mei-Huei; Hsieh, Wu-Shiun; Andersen, Melvin E.; Clewell, Harvey J.; Longnecker, Matthew P. (Peer reviewed; Journal article, 2015-12)Background: Prenatal exposure to perfluoroalkyl substances (PFAS) has been associated with lower birth weight in epidemiologic studies. This association could be attributable to glomerular filtration rate (GFR), which is ... -
Availability and access in modern obstetric care: a retrospective population-based study
Engjom, Hilde Marie; Morken, Nils-Halvdan; Norheim, Ole Frithjof; Klungsøyr, Kari (Peer reviewed; Journal article, 2014)Objective: To assess the availability of obstetric institutions, the risk of unplanned delivery outside an institution and maternal morbidity in a national setting in which the number of institutions declined from 95 to ... -
Candidate gene analysis of spontaneous preterm delivery: New insights from re-analysis of a case-control study using case-parent triads and control-mother dyads
Myking, Solveig; Myhre, Ronny; Gjessing, Håkon K.; Morken, Nils-Halvdan; Sengpiel, Verena; Williams, Scott M.; Ryckman, Kelli K.; Magnus, Per; Jacobsson, Bo (Peer reviewed; Journal article, 2011-12-30)Background: Spontaneous preterm delivery (PTD) has a multifactorial etiology with evidence of a genetic contribution to its pathogenesis. A number of candidate gene case-control studies have been performed on spontaneous ... -
Gestational diabetes mellitus and interpregnancy weight change: A population-based cohort study
Sørbye, Linn Marie; Skjaerven, Rolv; Klungsøyr, Kari; Morken, Nils-Halvdan (Peer reviewed; Journal article, 2017-08-01)Background: Being overweight is an important risk factor for Gestational Diabetes Mellitus (GDM), but the underlying mechanisms are not understood. Weight change between pregnancies has been suggested to be an independent ... -
Increased risk of peripartum perinatal mortality in unplanned births outside an institution: a retrospective population-based study
Engjom, Hilde Marie; Morken, Nils-Halvdan; Høydahl, Even; Norheim, Ole Frithjof; Klungsøyr, Kari (Peer reviewed; Journal article, 2017-08)Background: Births in midwife-led institutions may reduce the frequency of medical interventions and provide cost-effective care, while larger institutions offer medically and technically advanced obstetric care. Unplanned ... -
Lipid levels after childbirth and association with number of children: A population-based cohort study
Pirnat, Aleksandra; deRoo, Lisa; Skjaerven, Rolv; Morken, Nils-Halvdan (Peer reviewed; Journal article, 2019-10-24)Objective Low parity women are at increased risk of cardiovascular mortality. Unfavourable lipid profiles have been found in one-child mothers years before they conceive. However, it remains unclear whether unfavourable ... -
Long-term mortality in mothers with perinatal losses and risk modification by surviving children and attained education: A population-based cohort study
Halland, Frode; Morken, Nils-Halvdan; deRoo, Lisa; Klungsøyr, Kari; Wilcox, Allen James; Skjaerven, Rolv (Peer reviewed; Journal article, 2016)Objective: To assess the association between perinatal losses and mother’s long-term mortality and modification by surviving children and attained education. Design: A population-based cohort study. Setting: Norwegian ... -
Maternal complications in pregnancy and childbirth for women with epilepsy: time trends in a nationwide cohort
Danielsson, Kim Christian; Gilhus, Nils Erik; Borthen, Ingrid; Lie, Rolv T.; Morken, Nils-Halvdan (Peer reviewed; Journal article, 2019)Objective: Obstetric trends show changes in complication rates and maternal characteristics such as caesarean section, induced labour, and maternal age. To what degree such general time trends and changing patterns of ... -
Maternal glomerular filtration rate in pregnancy and fetal size
Morken, Nils-Halvdan; Travlos, Gregory S.; Wilson, Ralph E.; Eggesbø, Merete Åse; Longnecker, Matthew P. (Peer reviewed; Journal article, 2014-07-08)Background The relationship of maternal glomerular filtration rate (GFR) in pregnancy to fetal size needs to be better characterized as it impacts an ongoing debate about confounding effect of maternal GFR in investigations ... -
Maternal reasons for requesting planned cesarean section in Norway: A qualitative study
Eide, Kristiane Tislevoll; Morken, Nils-Halvdan; Bærøe, Kristine (Peer reviewed; Journal article, 2019)Background: Pregnant women who request a cesarean section in the absence of obstetric indication have become a highly debated issue in academic as well as popular literature. In order to find adequate, targeted treatment ... -
Perinatal mortality by gestational week and size at birth in singleton pregnancies at and beyond term: a nationwide population-based cohort study
Morken, Nils-Halvdan; Klungsøyr, Kari; Skjærven, Rolv (Peer reviewed; Journal article, 2014-05-22)Background: Whether gestational age per se increases perinatal mortality in post-term pregnancy is unclear. We aimed at assessing gestational week specific perinatal mortality in small-for-gestational-age (SGA) and non-SGA ... -
Placental abruption and long-term maternal cardiovascular disease mortality: a population-based registry study in Norway and Sweden
deRoo, Lisa; Skjaerven, Rolv; Wilcox, Allen; Klungsøyr, Kari; Wikström, Anna-Karin; Morken, Nils-Halvdan; Cnattingius, Sven (Peer reviewed; Journal article, 2016-05)Women with preeclamptic pregnancies have increased long-term cardiovascular disease (CVD) mortality. We explored this mortality risk among women with placental abruption, another placental pathology. We used linked Medical ... -
Reference population for international comparisons and time trend surveillance of preterm delivery proportions in three countries
Morken, Nils-Halvdan; Vogel, Ida; Kallen, Karin; Skjærven, Rolv; Langhoff-Roos, Jens; Kesmodel, Ulrik Schiøler; Jacobsson, Bo (Peer reviewed; Journal article, 2008-09-25)Background: International comparison and time trend surveillance of preterm delivery rates is complex. New techniques that could facilitate interpretation of such rates are needed. Methods: We studied all live births and ... -
Role of maternal age and pregnancy history in risk of miscarriage: prospective register based study
Magnus, Maria Christine; Wilcox, Allen J; Morken, Nils-Halvdan; Weinberg, Clarice R.; Håberg, Siri Eldevik (Peer reviewed; Journal article, 2019)Objectives: To estimate the burden of miscarriage in the Norwegian population and to evaluate the associations with maternal age and pregnancy history. Design: Prospective register based study. Setting: Medical Birth ... -
Tensions and interplay: A qualitative study of access to patient-centered birth counseling of maternal cesarean requests in Norway
Eide, Kristiane Tislevoll; Morken, Nils-Halvdan; Bærøe, Kristine (Journal article; Peer reviewed, 2020)Objective: This study aimed to explore women's access to patient-centered counseling for concerns initiating cesarean requests in absence of obstetric indications in pregnancy, and to identify tensions, barriers and ... -
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 (Peer reviewed; Journal article, 2017-11)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 ... -
Women's prepregnancy lipid levels and number of children: a Norwegian prospective population-based cohort study
Pirnat, Aleksandra; deRoo, Lisa; Skjaerven, Rolv; Morken, Nils-Halvdan (Peer reviewed; Journal article, 2018)Objective. To study prepregnancy serum lipid levels and the association with the number of children. Design. Prospective, population-based cohort. Setting. Linked data from the Cohort of Norway and the Medical Birth Registry ...