Jørn Olsen
Datos Biográficos
| ID | 3928911 |
|---|---|
| NOMBRE | Jørn Olsen |
| NOMBRES | Jørn |
| APELLIDO | Olsen |
| FIRMA | OLSEN J |
| AFILIACIONES | Aarhus University |
| ORCID | 0000-0001-7462-2740 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 24 |
| TOTAL DE CITAS | 37 |
| TOTAL COMO AUTOR | 24 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 1987 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2020 |
| ÍNDICE H | 3 |
Maternal Bereavement the Year Before or During Pregnancy and Total and Cause-Specific Infant Mortality
OBJECTIVE: We analyzed the associations between maternal bereavement the year before or during pregnancy and total and cause-specific infant mortality (IM). METHODS: We studied live singleton births from the Danish (1978-2008) and Swedish Medical Birth Registers (1973-2006; N = 5,114,246). Information on maternal sociodemographic, pregnancy-related, and health-related factors, and death of family members was obtained from nationwide registers. RE…
Prenatal Exposure to Perfluoroalkyl Substances and Birth Outcomes; An Updated Analysis from the Danish National Birth Cohort
Perfluoroalkyl substances (PFASs) are widespread industrial pollutants that are extremely persistent in the environment. A previous study in the Danish National Birth Cohort (DNBC) found prenatal perfluorooctanoate (PFOA) exposure was associated with decreased birth weight, but had insufficient statistical power to evaluate adverse birth outcomes. Here, we conducted additional analyses in three samples originating from the DNBC for 3535 mothers a…
Prospective cohort analysis of cellphone use and emotional and behavioural difficulties in children
BACKGROUND: We previously reported associations between cellphone exposure and emotional and behavioural difficulties in children in the Danish National Birth Cohort using cross-sectional data. To overcome the limitations of cross-sectional analysis, we re-examined these associations with prospectively collected data. METHODS: Based on maternal reports, prenatal and postnatal cellphone exposures were assessed at age 7 years, and emotional and beh…
Severe stress following bereavement during pregnancy and risk of pregnancy loss
BACKGROUND: Previous findings on the association between stress during pregnancy and pregnancy loss are inconsistent. We aimed to estimate this association using a large prospective cohort. METHODS: This population-based study included all 1 303 660 clinically recognised pregnancies in Denmark between 1995 and 2008. We categorised women as exposed to severe stress if they lost a child, sibling or parent during pregnancy. Cox Proportional Hazards …
On the association of cell phone exposure with childhood behaviour
We were pleased to read the paper by Guxens et al,1 which examined the association of prenatal cell phone and cordless phone use with behavioural problems in children. We are encouraged to see new research on this topic, but would like to point out several limitations in that study. The authors concluded that they did not find an association between prenatal cell phone use and behavioural problems in children, and that their findings differed fro…
Cell phone use and behavioural problems in young children
BACKGROUND: Potential health effects of cell phone use in children have not been adequately examined. As children are using cell phones at earlier ages, research among this group has been identified as the highest priority by both national and international organisations. The authors previously reported results from the Danish National Birth Cohort (DNBC), which looked at prenatal and postnatal exposure to cell phone use and behavioural problems …
P2-153 Prenatal stress following maternal bereavement during pregnancy and overweight in the offspring
Introduction It has been suggested that prenatal stress contributes to the risk of obesity later in life. In a population-based cohort study, we examined whether prenatal stress related to maternal bereavement during pregnancy was associated with the risk of overweight in the offspring in young adulthood. Methods We conduct a cohort study of 109 919 Danish men who were born in 1986-1990 and presented for conscription in 2006–2009. By linkage of t…
Authors' response
Maternal Psychosocial Adversity During Pregnancy Is Associated With Length of Gestation and Offspring Size at Birth
OBJECTIVE: To study in a large-scale cohort with prospective data the associations of psychosocial adversities during pregnancy with length of gestation and offspring size at birth. METHODS: We defined a priori two types of psychosocial adversity during pregnancy: life stress (perceived burdens in major areas of life) and emotional symptoms (e.g. anxiety). Measures of offspring size at birth, including body weight, body length, abdominal and head…
Communicating evidence and uncertainties on health risks from regular use of mobile phones
Udgivelsesdato: 2010-Apr
Prenatal Stress and Cerebral Palsy
OBJECTIVES: Exposure to prenatal stress may affect neurodevelopment of the fetus, but whether this exposure increases the risk of cerebral palsy (CP) later in life is unknown. We aimed to examine the association between maternal bereavement during the prenatal time period and CP in childhood. METHODS: We conducted a nationwide cohort study by linking information from nationwide registers. All 1,501,894 singletons born in Denmark from 1979 to 2004…
Do inattention and hyperactivity symptoms equal scholastic impairment? evidence from three European cohorts
These results extend previous reports of scholastic impairment among children with clinically diagnosed ADHD to non-referred population samples from three European countries. Surveillance policies should be implemented in school systems to catch children in need of behavioral or scholastic support early
Hospitalization for Mental Illness among Parents after the Death of a Child
BACKGROUND: The loss of a child is considered one of the most stressful events in the life of a parent. We hypothesized that parental bereavement increases the risk of hospital admission for a psychiatric disorder, especially for affective disorders. METHODS: We studied a cohort of 1,082,503 persons identified from national registers in Denmark who were born between 1952 and 1999 and had at least one child under 18 years of age during the follow-…
Psychosocial and physical work environment, and risk of pelvic pain in pregnancy. A study within the Danish national birth cohort
Objective: The sparse knowledge of the aetiology of pelvic pain in pregnancy makes evidence based prevention a limited option. The aim of this study was to examine the relation between pelvic pain in pregnancy and physical and psychosocial working conditions. Methods: This study used self reported data on working conditions for 1219 cases and 1539 controls, sampled as a nested case-control study within the Danish national birth cohort. Cases and …
Mortality in parents after death of a child in Denmark
What characterises a useful concept of causation in epidemiology
It has recently been suggested that epidemiologists should avoid thinking of causes in deterministic terms. This would mean giving up the component-cause model in its original form. A model that has provided important contributions as to how we develop hypotheses, design our study, analyse data, interpret and communicate our results. The component-cause model has considerably more to offer than a simple probabilistic concept. What a causal model …
Socioeconomic and work related determinants of pregnancy outcome in southern Thailand
STUDY OBJECTIVE: To examine the effect of socioeconomic status on pregnancy outcome in an urbanised area in a rapidly developing country. METHODS: A cohort of 1797 pregnant women who attended antenatal care clinics at the two 700 bed hospitals in Hatyai city was recruited from September 1994 to November 1995. The pregnant women were followed up from the 17th week of gestation until delivery. The socioeconomic indicators selected were family socio…
Study of environmental, social, and paternal factors in preterm delivery using sibs and half sibs. A population-based study in Denmark
OBJECTIVE: The aim of this study was to evaluate the influence on preterm delivery of changes in putative genetic and environmental risk factors between two consecutive births. Low social status is a suspected risk indicator of preterm delivery, but the impact of social mobility has not been studied before. PARTICIPANTS: The study uses national cohorts in which women act as their own controls. Subjects were identified by means of registries: 10,4…
Options in making use of pregnancy history in planning and analysing studies of reproductive failure
BACKGROUND--Although more epidemiological studies of reproductive health have been published recently, important scientific achievements remain few. Among the reasons for this are existing methodological constraints. Fertility is low in most parts of the industralized world, making the observation time short. Pregnancy itself is under extremely close medical surveillance with intensive health care interventions such as prenatal screening, induced…
Variability of self reported measures of alcohol consumption
STUDY OBJECTIVE--To describe the intra-subject variability of self reported maternal alcohol consumption using different ways of collecting information and to analyse the implications of this variability for research into the effect of low to moderate maternal alcohol consumption on birth weight. DESIGN--This was a longitudinal study. Self reported maternal alcohol consumption before, during, and after pregnancy was assessed on four occasions ove…
Birth weight and gestational age among children of Danish pharmacy assistants
STUDY OBJECTIVE--The aim was to investigate whether specific types of work or exposures among pharmacy assistants were correlated with changes in birth weight or gestational age. DESIGN--The study was a nationwide historical cohort with open entry of all female members of the union of pharmacy assistants during 1979 to 1984. PARTICIPANTS--The cohort comprised 4939 pharmacy assistants under 40 years of age. The questionnaire was answered by 93%. M…
Social networks and longevity. A 14 year follow-up study among elderly in Denmark
Coital frequency and twinning
In a comparative study to enquire whether parents of twins, especially of dizygotic twins, have a higher frequency of sexual intercourse than parents of singleton infants, data on sociodemographic status, coital frequency and other variables were collected using a postal questionnaire. Parents of all twins born alive in Denmark in 1984 or 1985 were included as cases and a random sample of parents of singleton infants born in the same period were …
Comparison of a dietary attitude index based on questionnaire data and a 7-day diet recall interview
Social networks and longevity. A 14 year follow-up study among elderly in Denmark
Cell phone use and behavioural problems in young children
BACKGROUND: Potential health effects of cell phone use in children have not been adequately examined. As children are using cell phones at earlier ages, research among this group has been identified as the highest priority by both national and international organisations. The authors previously reported results from the Danish National Birth Cohort (DNBC), which looked at prenatal and postnatal exposure to cell phone use and behavioural problems …
What characterises a useful concept of causation in epidemiology
It has recently been suggested that epidemiologists should avoid thinking of causes in deterministic terms. This would mean giving up the component-cause model in its original form. A model that has provided important contributions as to how we develop hypotheses, design our study, analyse data, interpret and communicate our results. The component-cause model has considerably more to offer than a simple probabilistic concept. What a causal model …
Socioeconomic and work related determinants of pregnancy outcome in southern Thailand
STUDY OBJECTIVE: To examine the effect of socioeconomic status on pregnancy outcome in an urbanised area in a rapidly developing country. METHODS: A cohort of 1797 pregnant women who attended antenatal care clinics at the two 700 bed hospitals in Hatyai city was recruited from September 1994 to November 1995. The pregnant women were followed up from the 17th week of gestation until delivery. The socioeconomic indicators selected were family socio…
Study of environmental, social, and paternal factors in preterm delivery using sibs and half sibs. A population-based study in Denmark
OBJECTIVE: The aim of this study was to evaluate the influence on preterm delivery of changes in putative genetic and environmental risk factors between two consecutive births. Low social status is a suspected risk indicator of preterm delivery, but the impact of social mobility has not been studied before. PARTICIPANTS: The study uses national cohorts in which women act as their own controls. Subjects were identified by means of registries: 10,4…
Variability of self reported measures of alcohol consumption
STUDY OBJECTIVE--To describe the intra-subject variability of self reported maternal alcohol consumption using different ways of collecting information and to analyse the implications of this variability for research into the effect of low to moderate maternal alcohol consumption on birth weight. DESIGN--This was a longitudinal study. Self reported maternal alcohol consumption before, during, and after pregnancy was assessed on four occasions ove…
On the association of cell phone exposure with childhood behaviour
We were pleased to read the paper by Guxens et al,1 which examined the association of prenatal cell phone and cordless phone use with behavioural problems in children. We are encouraged to see new research on this topic, but would like to point out several limitations in that study. The authors concluded that they did not find an association between prenatal cell phone use and behavioural problems in children, and that their findings differed fro…
Options in making use of pregnancy history in planning and analysing studies of reproductive failure
BACKGROUND--Although more epidemiological studies of reproductive health have been published recently, important scientific achievements remain few. Among the reasons for this are existing methodological constraints. Fertility is low in most parts of the industralized world, making the observation time short. Pregnancy itself is under extremely close medical surveillance with intensive health care interventions such as prenatal screening, induced…
Comparison of a dietary attitude index based on questionnaire data and a 7-day diet recall interview
Coital frequency and twinning
In a comparative study to enquire whether parents of twins, especially of dizygotic twins, have a higher frequency of sexual intercourse than parents of singleton infants, data on sociodemographic status, coital frequency and other variables were collected using a postal questionnaire. Parents of all twins born alive in Denmark in 1984 or 1985 were included as cases and a random sample of parents of singleton infants born in the same period were …
Birth weight and gestational age among children of Danish pharmacy assistants
STUDY OBJECTIVE--The aim was to investigate whether specific types of work or exposures among pharmacy assistants were correlated with changes in birth weight or gestational age. DESIGN--The study was a nationwide historical cohort with open entry of all female members of the union of pharmacy assistants during 1979 to 1984. PARTICIPANTS--The cohort comprised 4939 pharmacy assistants under 40 years of age. The questionnaire was answered by 93%. M…
Social networks and longevity. A 14 year follow-up study among elderly in Denmark
Variability of self reported measures of alcohol consumption
STUDY OBJECTIVE--To describe the intra-subject variability of self reported maternal alcohol consumption using different ways of collecting information and to analyse the implications of this variability for research into the effect of low to moderate maternal alcohol consumption on birth weight. DESIGN--This was a longitudinal study. Self reported maternal alcohol consumption before, during, and after pregnancy was assessed on four occasions ove…
Options in making use of pregnancy history in planning and analysing studies of reproductive failure
BACKGROUND--Although more epidemiological studies of reproductive health have been published recently, important scientific achievements remain few. Among the reasons for this are existing methodological constraints. Fertility is low in most parts of the industralized world, making the observation time short. Pregnancy itself is under extremely close medical surveillance with intensive health care interventions such as prenatal screening, induced…
Socioeconomic and work related determinants of pregnancy outcome in southern Thailand
STUDY OBJECTIVE: To examine the effect of socioeconomic status on pregnancy outcome in an urbanised area in a rapidly developing country. METHODS: A cohort of 1797 pregnant women who attended antenatal care clinics at the two 700 bed hospitals in Hatyai city was recruited from September 1994 to November 1995. The pregnant women were followed up from the 17th week of gestation until delivery. The socioeconomic indicators selected were family socio…
Study of environmental, social, and paternal factors in preterm delivery using sibs and half sibs. A population-based study in Denmark
OBJECTIVE: The aim of this study was to evaluate the influence on preterm delivery of changes in putative genetic and environmental risk factors between two consecutive births. Low social status is a suspected risk indicator of preterm delivery, but the impact of social mobility has not been studied before. PARTICIPANTS: The study uses national cohorts in which women act as their own controls. Subjects were identified by means of registries: 10,4…
Mortality in parents after death of a child in Denmark
What characterises a useful concept of causation in epidemiology
It has recently been suggested that epidemiologists should avoid thinking of causes in deterministic terms. This would mean giving up the component-cause model in its original form. A model that has provided important contributions as to how we develop hypotheses, design our study, analyse data, interpret and communicate our results. The component-cause model has considerably more to offer than a simple probabilistic concept. What a causal model …
Hospitalization for Mental Illness among Parents after the Death of a Child
BACKGROUND: The loss of a child is considered one of the most stressful events in the life of a parent. We hypothesized that parental bereavement increases the risk of hospital admission for a psychiatric disorder, especially for affective disorders. METHODS: We studied a cohort of 1,082,503 persons identified from national registers in Denmark who were born between 1952 and 1999 and had at least one child under 18 years of age during the follow-…
Psychosocial and physical work environment, and risk of pelvic pain in pregnancy. A study within the Danish national birth cohort
Objective: The sparse knowledge of the aetiology of pelvic pain in pregnancy makes evidence based prevention a limited option. The aim of this study was to examine the relation between pelvic pain in pregnancy and physical and psychosocial working conditions. Methods: This study used self reported data on working conditions for 1219 cases and 1539 controls, sampled as a nested case-control study within the Danish national birth cohort. Cases and …
Do inattention and hyperactivity symptoms equal scholastic impairment? evidence from three European cohorts
These results extend previous reports of scholastic impairment among children with clinically diagnosed ADHD to non-referred population samples from three European countries. Surveillance policies should be implemented in school systems to catch children in need of behavioral or scholastic support early
Prenatal Stress and Cerebral Palsy
OBJECTIVES: Exposure to prenatal stress may affect neurodevelopment of the fetus, but whether this exposure increases the risk of cerebral palsy (CP) later in life is unknown. We aimed to examine the association between maternal bereavement during the prenatal time period and CP in childhood. METHODS: We conducted a nationwide cohort study by linking information from nationwide registers. All 1,501,894 singletons born in Denmark from 1979 to 2004…
Maternal Psychosocial Adversity During Pregnancy Is Associated With Length of Gestation and Offspring Size at Birth
OBJECTIVE: To study in a large-scale cohort with prospective data the associations of psychosocial adversities during pregnancy with length of gestation and offspring size at birth. METHODS: We defined a priori two types of psychosocial adversity during pregnancy: life stress (perceived burdens in major areas of life) and emotional symptoms (e.g. anxiety). Measures of offspring size at birth, including body weight, body length, abdominal and head…
Communicating evidence and uncertainties on health risks from regular use of mobile phones
Udgivelsesdato: 2010-Apr
P2-153 Prenatal stress following maternal bereavement during pregnancy and overweight in the offspring
Introduction It has been suggested that prenatal stress contributes to the risk of obesity later in life. In a population-based cohort study, we examined whether prenatal stress related to maternal bereavement during pregnancy was associated with the risk of overweight in the offspring in young adulthood. Methods We conduct a cohort study of 109 919 Danish men who were born in 1986-1990 and presented for conscription in 2006–2009. By linkage of t…
Authors' response
Cell phone use and behavioural problems in young children
BACKGROUND: Potential health effects of cell phone use in children have not been adequately examined. As children are using cell phones at earlier ages, research among this group has been identified as the highest priority by both national and international organisations. The authors previously reported results from the Danish National Birth Cohort (DNBC), which looked at prenatal and postnatal exposure to cell phone use and behavioural problems …
On the association of cell phone exposure with childhood behaviour
We were pleased to read the paper by Guxens et al,1 which examined the association of prenatal cell phone and cordless phone use with behavioural problems in children. We are encouraged to see new research on this topic, but would like to point out several limitations in that study. The authors concluded that they did not find an association between prenatal cell phone use and behavioural problems in children, and that their findings differed fro…
Prospective cohort analysis of cellphone use and emotional and behavioural difficulties in children
BACKGROUND: We previously reported associations between cellphone exposure and emotional and behavioural difficulties in children in the Danish National Birth Cohort using cross-sectional data. To overcome the limitations of cross-sectional analysis, we re-examined these associations with prospectively collected data. METHODS: Based on maternal reports, prenatal and postnatal cellphone exposures were assessed at age 7 years, and emotional and beh…
Severe stress following bereavement during pregnancy and risk of pregnancy loss
BACKGROUND: Previous findings on the association between stress during pregnancy and pregnancy loss are inconsistent. We aimed to estimate this association using a large prospective cohort. METHODS: This population-based study included all 1 303 660 clinically recognised pregnancies in Denmark between 1995 and 2008. We categorised women as exposed to severe stress if they lost a child, sibling or parent during pregnancy. Cox Proportional Hazards …
Prenatal Exposure to Perfluoroalkyl Substances and Birth Outcomes; An Updated Analysis from the Danish National Birth Cohort
Perfluoroalkyl substances (PFASs) are widespread industrial pollutants that are extremely persistent in the environment. A previous study in the Danish National Birth Cohort (DNBC) found prenatal perfluorooctanoate (PFOA) exposure was associated with decreased birth weight, but had insufficient statistical power to evaluate adverse birth outcomes. Here, we conducted additional analyses in three samples originating from the DNBC for 3535 mothers a…
Maternal Bereavement the Year Before or During Pregnancy and Total and Cause-Specific Infant Mortality
OBJECTIVE: We analyzed the associations between maternal bereavement the year before or during pregnancy and total and cause-specific infant mortality (IM). METHODS: We studied live singleton births from the Danish (1978-2008) and Swedish Medical Birth Registers (1973-2006; N = 5,114,246). Information on maternal sociodemographic, pregnancy-related, and health-related factors, and death of family members was obtained from nationwide registers. RE…
Medicine (22 obras) · Pregnancy (14 obras) · Environmental health (13 obras) · Demography (12 obras) · Cohort (11 obras) · Obstetrics (11 obras) · Population (11 obras) · Cohort study (10 obras) · Internal Medicine (10 obras) · Internal Medicine (10 obras)