Anne-Siri Øyen

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IMPORTANCE Prenatal folic acid supplements reduce the risk of neural tube defects in children, but it has not been determined whether they protect against other neurodevelopmental disorders. OBJECTIVE To examine the association between maternal use of prenatal folic acid supplements and subsequent risk of autism spectrum disorders (ASDs) (autistic(More)
BACKGROUND Numerous studies have investigated the prevalence of neurologic and neurodevelopmental disorders individually, but few have examined them collectively, and there is uncertainty as to what extent they overlap. METHODS The study has determined the proportions of children aged 0 to 11 years with diagnoses of autism spectrum disorder (ASD),(More)
BACKGROUND A recent California study reported increased risk of autistic disorder in children conceived within a year after the birth of a sibling. METHODS We assessed the association between interpregnancy interval and risk of autistic disorder using nationwide registry data on pairs of singleton full siblings born in Norway. We defined interpregnancy(More)
BACKGROUND This study examined potential self-selection bias in a large pregnancy cohort by comparing exposure-outcome associations from the cohort to similar associations obtained from nationwide registry data. The outcome under study was specialist-confirmed diagnosis of autism spectrum disorders (ASDs). METHODS The cohort sample (n = 89 836) was(More)
BACKGROUND In 2012, we published an overview of the prevalence of developmental disorders and neurological diseases in children in Norway, which was unknown at the time. In this article we will compare diagnostics and treatment across counties and institutions. MATERIAL AND METHOD The prevalence across counties of autism spectrum disorders, ADHD, epilepsy(More)
PURPOSE Antiepileptic drugs may cause congenital malformations. Less is known about the effect on development in infancy and childhood. The aim of this study was to examine whether exposure to antiepileptic drugs during pregnancy has an effect on early child development. METHODS From mid-1999 through December 2008, children of mothers recruited at 13-17(More)
The reported prevalence of autism spectrum disorders (ASD) has increased 5–10× over the past 20 years. Whether ASD are truly more frequent is controversial; nonetheless, the burden is profound in human and economic terms. Although autism is among the most heritable of mental disorders, its pathogenesis remains obscure. Environmental factors are proposed;(More)
OBJECTIVE Growing awareness that symptoms of autism spectrum disorder (ASD) transcend multiple diagnostic categories, and major advances in the identification of genetic syndromes associated with ASD, have led to widespread use of ASD symptom measures in etiologic studies of neurodevelopmental disorders. Insufficient consideration of potentially confounding(More)
Background: Autism spectrum disorders (ASDs) are characterized by persistent deficits in social communication and interaction and restricted, repetitive patterns of behavior, interests or activities. In most cases, the cause of ASD is likely to be a combination of genetic predisposition and environmental exposures occurring in fetal life or early infancy.(More)
Maternal infections during pregnancy are associated with risk of neurodevelopmental disorders, including autism spectrum disorders (ASDs). Proposed pathogenetic mechanisms include fetal infection, placental inflammation, and maternal cytokines or antibodies that cross the placenta. The Autism Birth Cohort comprises mothers, fathers, and offspring recruited(More)