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Jørgen H. Olsen
University of Copenhagen
Cohort studyPregnancyPopulationMedicineCohort
1,463Publications
106H-index
55.5kCitations
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Publications 1392
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#1Nis Brix (AU: Aarhus University)H-Index: 4
#2Andreas Ernst (AU: Aarhus University)H-Index: 5
Last. Cecilia Host Ramlau-Hansena (AU: Aarhus University)
view all 8 authors...
BACKGROUND: Early puberty is a risk indicator for adult diseases. Identification of modifiable causes of earlier puberty is, therefore, warranted. We estimate the association between childhood body mass index (BMI) and pubertal timing in a cohort study and in a sibling-matched study to adjust for unobserved time-stable confounders shared within families. METHODS: For the cohort study, 11 046 of 22 439 (49%) invited children, born 2000-203, from the Danish National Birth Cohort (DNBC) had informa...
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#1Ina Olmer Specht (Frederiksberg Hospital)H-Index: 8
#2Fanney Thorsteinsdottir (Frederiksberg Hospital)
Last. Berit L. Heitmann (UCPH: University of Copenhagen)H-Index: 50
view all 5 authors...
OBJECTIVE: Epilepsy is a nervous system abnormality that may be caused by unknown exposures during fetal development. Studies have shown neuroprotective effects of early exposure to vitamin D in other neurological disorders, and seasonal variation in birth of children with epilepsy. We aimed to investigate if neonatal 25(OH)D3 was associated with risk of childhood epilepsy. METHODS: This case-cohort study compared neonatal 25(OH)D3 levels from children with epilepsy (n = 403) and a random select...
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#1Julia E. Heck (UCLA: University of California, Los Angeles)H-Index: 24
#2Pei-Chen Lee (National Taipei University of Nursing and Health Science)H-Index: 10
Last. Onyebuchi A. Arah (UCLA: University of California, Los Angeles)H-Index: 36
view all 11 authors...
Spina bifida has been reported to co-occur with pediatric cancer, but comprehensive evaluations remained elusive. We investigated this co-occurrence in two large, population-based studies in Taiwan (N = 1900 cancer cases, 2,077,137 controls) and Denmark (N = 5508 cases, 137,700 controls). Analyses in Denmark were restricted to the period before prenatal diagnostics became available (2004) and pregnancy terminations of fetuses with birth defects became more common. Using national patient and canc...
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#1Zeyan Liew (Yale University)H-Index: 14
#2Jiajun Luo (Yale University)
Last. Jørgen H. Olsen (Aarhus University Hospital)H-Index: 106
view all 7 authors...
BACKGROUND: Per organic pollutants and endocrine disruptors. High doses of perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) exposure can cause pregnancy loss and infant deaths in animals, but the associations between PFAS exposures and risk of miscarriage in humans are not well studied. METHODS: Using a case-control study nested within the Danish National Birth Cohort (DNBC, 1996-2002), we compared 220 pregnancies ending in miscarriage during weeks 12-22 of gestation, with 2...
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#1Nis Brix (UCLA: University of California, Los Angeles)H-Index: 4
#2Andreas Ernst (UCLA: University of California, Los Angeles)H-Index: 3
Last. Cecilia Høst Ramlau-Hansen (AU: Aarhus University)H-Index: 19
view all 8 authors...
BACKGROUND: Non-participation in aetiologic studies of pubertal timing is frequent. However, little effort has been given to explore the risk and potential impact of selection bias in studies of pubertal timing. OBJECTIVE: We aimed to explore the risk of selection bias due to non-participation in a newly established puberty cohort. METHODS: We evaluated whether three maternal exposures chosen a priori (pre-pregnancy obesity, smoking, and alcohol drinking during pregnancy) were associated with pa...
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#1A. Wu (Columbia University)H-Index: 10
#2Monica Kieff (Columbia University)
Last. Jens Waschke (LMU: Ludwig Maximilian University of Munich)H-Index: 28
view all 16 authors...
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Author(s): Heck, Julia E; Huang, Xiwen; Calkins, Kara L; Sun, Yuelian; Olsen, Jorn; Ritz, Beate; Hansen, Johnni
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#1Yu Gao (SJTU: Shanghai Jiao Tong University)H-Index: 13
#2Yongfu Yu (Aarhus University Hospital)H-Index: 2
Last. Zeyan Liew (Yale University)H-Index: 14
view all 10 authors...
Importance: Advanced parental age has been associated with autism spectrum disorders (ASDs) in children. However, little is known about the association between grandparental age at the time of birth of the parent and the risk of ASD in the grandchildren. Objective: To estimate the associations between parental and grandparental age and ASD risk in children. Design, Setting, and Participants: This population-based, multigenerational cohort study used data from Danish national health registries. A...
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#1Helene Kirkegaard (University of Southern Denmark)H-Index: 6
#2Søren Møller (University of Southern Denmark)H-Index: 47
Last. Ellen A. Nohr (University of Southern Denmark)H-Index: 46
view all 7 authors...
BACKGROUND: The correlates of prenatal and postnatal growth on Intelligence Quotient (IQ) in childhood in term-born children living in high-income countries are not well known. OBJECTIVES: We examined how birth size and growth in infancy and childhood were associated with IQ at age 5 y in term-born children using path analysis. METHODS: The study sample comprised 1719 children from the Danish National Birth Cohort who participated in a substudy in which psychologists assessed IQ using the Wechsl...
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#1A. Wu (Columbia University)H-Index: 10
#2Geoffroy Noel (McGill University)H-Index: 3
Last. Franziska Vielmuth (LMU: Ludwig Maximilian University of Munich)H-Index: 10
view all 16 authors...
Background: At a time of global interconnectedness, the internationalization of medical education has become important. Anatomy as an academic discipline, with its close connections to the basic sciences and to medical education, can easily be connected with global health and internationalization of medical education. Here the authors present an international program based on a partnership between twelve anatomy departments in ten countries, on four continents. Details of a proposed plan for the...
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