J. Olsen

Publications466
h-index66
Citations15,889
Highly Influential Citations603
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The Danish Medical Birth Registry.
BACKGROUND The Danish Medical Birth Registry (MBR) was established in 1968 and has been computerized since 1973. The primary purpose of the registration is to monitor the health of the newborns and… Expand
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Maternal lifestyle factors in pregnancy risk of attention deficit hyperactivity disorder and associated behaviors: review of the current evidence.
OBJECTIVE The purpose of this review was to examine the literature assessing the relationship between prenatal exposure to nicotine, alcohol, caffeine, and psychosocial stress during pregnancy to the… Expand
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Combined associations of prepregnancy body mass index and gestational weight gain with the outcome of pregnancy.
BACKGROUND Although both maternal prepregnancy body mass index (BMI) and gestational weight gain (GWG) may affect birth weight, their separate and joint associations with complications of pregnancy… Expand
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A population-based study of measles, mumps, and rubella vaccination and autism.
BACKGROUND It has been suggested that vaccination against measles, mumps, and rubella (MMR) is a cause of autism. METHODS We conducted a retrospective cohort study of all children born in Denmark… Expand
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A framework for evaluation of secondary data sources for epidemiological research.
TLDR
We discuss the following factors affecting the value of secondary data in research: 1) completeness of registration of individuals, 2) the accuracy of the registered data, 3) the size of the data source, 4) the registration period, 5) data accessibility, availability and cost, 6) data format, and 7) possibilities of linkage with other data sources (record linkage). Expand
  • 439
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The role of sport-fish consumption advisories in mercury risk communication: a 1998-1999 12-state survey of women age 18-45.
BACKGROUND In 2002, in the United States, 48 states issued advisories for sport-fish consumers that included 39 chemical contaminants. The most commonly identified chemical was methyl mercury, which… Expand
  • 73
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Does Low Participation in Cohort Studies Induce Bias?
Background: Participation rates in large cohort studies have decreased during the last 2 decades. The consequences of this trend for relative risk estimation are unknown. Methods: The impact of a low… Expand
  • 518
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Risk of early or severe pre-eclampsia related to pre-existing conditions.
BACKGROUND Preeclampsia (PE), especially severe or early PE, is a leading cause of morbidity and mortality among mothers and infants. We estimated the population attributable fractions of severe or… Expand
  • 156
  • 9
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Perinatal and maternal complications related to postterm delivery: a national register-based study, 1978-1993.
OBJECTIVE This study was undertaken to estimate the risk of fetal and maternal complications associated with postterm delivery in Denmark. STUDY DESIGN A cross-sectional study that used records… Expand
  • 220
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Body mass index and delayed conception: a European Multicenter Study on Infertility and Subfecundity.
Obesity has become a health problem in affluent societies, but few studies have investigated its effect on subfertility. Previous studies were based on select groups of women, focused mainly on… Expand
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