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An international contrast of rates of placental abruption: an age-period-cohort analysis.

https://arctichealth.org/en/permalink/ahliterature272271
Source
PLoS One. 2015;10(5):e0125246
Publication Type
Article
Date
2015
Author
Cande V Ananth
Katherine M Keyes
Ava Hamilton
Mika Gissler
Chunsen Wu
Shiliang Liu
Miguel Angel Luque-Fernandez
Rolv Skjærven
Michelle A Williams
Minna Tikkanen
Sven Cnattingius
Source
PLoS One. 2015;10(5):e0125246
Date
2015
Language
English
Publication Type
Article
Keywords
Abruptio Placentae - epidemiology
Age Distribution
Canada - epidemiology
Cohort Studies
Denmark - epidemiology
Female
Finland - epidemiology
Humans
Maternal Age
Norway - epidemiology
Pregnancy
Prevalence
Risk factors
Smoking
Spain - epidemiology
Sweden
United States - epidemiology
Abstract
Although rare, placental abruption is implicated in disproportionately high rates of perinatal morbidity and mortality. Understanding geographic and temporal variations may provide insights into possible amenable factors of abruption. We examined abruption frequencies by maternal age, delivery year, and maternal birth cohorts over three decades across seven countries.
Women that delivered in the US (n = 863,879; 1979-10), Canada (4 provinces, n = 5,407,463; 1982-11), Sweden (n = 3,266,742; 1978-10), Denmark (n = 1,773,895; 1978-08), Norway (n = 1,780,271, 1978-09), Finland (n = 1,411,867; 1987-10), and Spain (n = 6,151,508; 1999-12) were analyzed. Abruption diagnosis was based on ICD coding. Rates were modeled using Poisson regression within the framework of an age-period-cohort analysis, and multi-level models to examine the contribution of smoking in four countries.
Abruption rates varied across the seven countries (3-10 per 1000), Maternal age showed a consistent J-shaped pattern with increased rates at the extremes of the age distribution. In comparison to births in 2000, births after 2000 in European countries had lower abruption rates; in the US there was an increase in rate up to 2000 and a plateau thereafter. No birth cohort effects were evident. Changes in smoking prevalence partially explained the period effect in the US (P = 0.01) and Sweden (P
Notes
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PubMed ID
26018653 View in PubMed
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Associations of serum 25-hydroxyvitamin D level with incidence of lung cancer and histologic types in Norwegian adults: a case-cohort analysis of the HUNT study.

https://arctichealth.org/en/permalink/ahliterature297760
Source
Eur J Epidemiol. 2018 01; 33(1):67-77
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Date
01-2018
Author
Yi-Qian Sun
Arnulf Langhammer
Chunsen Wu
Frank Skorpen
Yue Chen
Tom Ivar Lund Nilsen
Pål Richard Romundstad
Xiao-Mei Mai
Author Affiliation
Department of Clinical and Molecular Medicine (IKOM), NTNU, Norwegian University of Science and Technology, Trondheim, Norway. yi-qian.sun@ntnu.no.
Source
Eur J Epidemiol. 2018 01; 33(1):67-77
Date
01-2018
Language
English
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Keywords
Adenocarcinoma - blood - epidemiology - pathology
Aged
Aged, 80 and over
Cohort Studies
Female
Humans
Incidence
Lung Neoplasms - blood - epidemiology - pathology
Male
Middle Aged
Norway - epidemiology
Prospective Studies
Vitamin D - analogs & derivatives - blood
Abstract
Previous prospective studies have shown inconsistent associations between serum 25-hydroxyvitamin D [25(OH)D] level and lung cancer incidence. The aim of the present study was to explore the associations of serum 25(OH)D levels with incidence of lung cancer overall and different histologic types. We performed a population-based prospective case-cohort study including 696 incident lung cancer cases and 5804 individuals in a subcohort who participated in the second survey of the Nord-Trøndelag Health Study in Norway. Cox proportional hazards regression models counting for the case-cohort design were used to estimate hazard ratios (HRs) with 95% confidence interval (CIs) for lung cancer overall or histologic types in relation to serum 25(OH)D levels. Compared with the fourth season-specific quartile of 25(OH)D (median 68.0 nmol/L), lower 25(OH)D levels were not associated with the incidence of overall, small or squamous cell lung cancer. However, the risk of adenocarcinoma was lower in the second and third quartiles (median 39.9 and 51.5 nmol/L) compared with the fourth quartile, with HRs of 0.63 (95% CI 0.41-0.98) and 0.58 (0.38-0.88), respectively. The associations of lower levels of 25(OH)D with a reduced risk of adenocarcinoma were only observed in the overweight/obese subjects [HRs for second and third quartiles: 0.40 (0.22-0.72) and 0.50 (0.27-0.92)] but not in the normal weight subjects [HRs: 0.95 (0.52-1.75) and 0.60 (0.32-1.10)]. Serum 25(OH)D levels were not associated with the risk of lung cancer in general. The observation that lower 25(OH)D levels were associated with a lower risk of adenocarcinoma should be interpreted with caution.
PubMed ID
29080012 View in PubMed
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Congenital cerebral palsy, child sex and parent cardiovascular risk.

https://arctichealth.org/en/permalink/ahliterature106189
Source
PLoS One. 2013;8(11):e79071
Publication Type
Article
Date
2013
Author
Elani Streja
Chunsen Wu
Peter Uldall
Jakob Grove
Onyebuchi Arah
Jørn Olsen
Author Affiliation
Department of Epidemiology, School of Public Health, University of California Los Angeles, Los Angeles, California, United States of America.
Source
PLoS One. 2013;8(11):e79071
Date
2013
Language
English
Publication Type
Article
Keywords
Adult
Cardiovascular Diseases - complications - epidemiology
Cerebral Palsy - epidemiology - etiology
Child
Cohort Studies
Denmark - epidemiology
Fathers
Female
Follow-Up Studies
Gestational Age
Humans
Incidence
Infant, Newborn
Male
Maternal Age
Middle Aged
Mothers
Pregnancy
Pregnancy Complications, Cardiovascular
Premature Birth - epidemiology
Proportional Hazards Models
Registries - statistics & numerical data
Risk Assessment - statistics & numerical data
Risk factors
Abstract
Genes associated with cardiovascular disease may also be risk factors for congenital cerebral palsy (CP) and these associations may be modified by sex, since there is an increased risk of CP in male children. We investigated the association between CP of the child with cardiovascular disease in parents, taking sex of the child into consideration.
All parents of non-adopted singletons born in Denmark between 1973 and 2003 were included. Parents of a child with CP, confirmed by the Danish National CP registry, were considered exposed. Cox proportional hazards regressions were used to model risk of cardiovascular outcomes for exposed parents compared to all other parents beginning at the child's 10(th) birthday.
We identified 733,730 mothers and 666,652 fathers among whom 1,592 and 1,484, respectively, had a child with CP. The mean age for mothers at end of follow up was 50 ± 8 years. After adjustment for maternal age, parental education, child's sex, child's residence, child being small for gestational age and maternal hypertensive disorder during pregnancy, mothers of CP male children had an excess risk of cardiovascular disease (HR: 1.52, 95% CI: 1.16-2.00), attributable mostly to an increased incidence of hypertension and cerebrovascular disease. After additional adjustment for preterm birth, the association was markedly attenuated for cardiovascular disease (1.34, 95%CI: 1.02 - 1.76), became nonsignificant for hypertension, but remained significant for cerebrovascular disease (HR: 2.73, 95% CI: 1.45- 5.12). There was no increased risk of cardiovascular events in mothers of female CP children, or fathers of CP children of any sex.
Women that have a male child with CP are at increased risk for premature cardiovascular disease. Part of this association may be related to risk factors for preterm births.
Notes
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PubMed ID
24223882 View in PubMed
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Disproportionate fetal growth and the risk for congenital cerebral palsy in singleton births.

https://arctichealth.org/en/permalink/ahliterature270219
Source
PLoS One. 2015;10(5):e0126743
Publication Type
Article
Date
2015
Author
Elani Streja
Jessica E Miller
Chunsen Wu
Bodil H Bech
Lars Henning Pedersen
Diana E Schendel
Peter Uldall
Jørn Olsen
Source
PLoS One. 2015;10(5):e0126743
Date
2015
Language
English
Publication Type
Article
Keywords
Adult
Birth weight
Cerebral Palsy - congenital - epidemiology - pathology
Cohort Studies
Denmark - epidemiology
Female
Fetal Development - physiology
Follow-Up Studies
Gestational Age
Head - anatomy & histology
Humans
Infant
Infant, Newborn
Male
Placenta - anatomy & histology - physiology
Pregnancy
Proportional Hazards Models
Risk factors
Smoking
Young Adult
Abstract
To investigate the association between proportionality of fetal and placental growth measured at birth and the risk for congenital cerebral palsy (CP).
We identified all live-born singletons born in Denmark between 1995 and 2003 and followed them from 1 year of age until December 31st, 2008. Information on four indices of fetal growth: ponderal index, head circumference/ abdominal circumference ratio, cephalization index and birth weight/ placenta weight ratio was collected. Cox proportional hazards regression models were used to estimate adjusted hazard ratios (aHR) and 95% confidence intervals (CI). All measurements were evaluated as gestational age and sex specific z-scores and in z-score percentile groups, adjusted for potential confounders, and stratified on gestational age groups (
Notes
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PubMed ID
25974407 View in PubMed
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Mental disorders in motherhood according to prepregnancy BMI and pregnancy-related weight changes--A Danish cohort study.

https://arctichealth.org/en/permalink/ahliterature269245
Source
J Affect Disord. 2015 Sep 1;183:322-9
Publication Type
Article
Date
Sep-1-2015
Author
Mette Bliddal
Anton Pottegård
Helene Kirkegaard
Jørn Olsen
Jan Stener Jørgensen
Thorkild I A Sørensen
Chunsen Wu
Ellen A Nohr
Source
J Affect Disord. 2015 Sep 1;183:322-9
Date
Sep-1-2015
Language
English
Publication Type
Article
Keywords
Adult
Anxiety - epidemiology - psychology
Body mass index
Cohort Studies
Comorbidity
Denmark - epidemiology
Depression, Postpartum - epidemiology - psychology
Female
Humans
Incidence
Male
Mothers - psychology - statistics & numerical data
Obesity - epidemiology - psychology
Pregnancy
Pregnancy Complications - psychology
Risk factors
Weight Gain
Young Adult
Abstract
Previous studies have shown an association between prepregnancy BMI and postpartum depression, but little is known about this association beyond one year postpartum and the influence of postpartum weight retention (PPWR).
We used data from 70355 mothers from the Danish National Birth Cohort to estimate the associations between maternal prepregnancy BMI and PPWR, respectively, and incident depression/anxiety disorders until six years postpartum. Outcome was depression or anxiety diagnosed clinically or filling a prescription for an antidepressant. Cox regression was used to estimate hazard ratios (HR) with 95% confidence intervals (CI). Follow-up started at the day of delivery. For the analysis regarding PPWR, follow-up started six months postpartum.
Underweight, overweight and obesity were associated with depression and/or anxiety disorders when compared to normal-weight, though the associations were attenuated after adjustments (HR 1.24 [95% CI 1.06-1.45], 1.05 [95% CI 0.96-1.15] and 1.07 [95% CI 0.95-1.21] for underweight, overweight and obese, respectively). Compared to mothers who had returned to their prepregnancy BMI, risk of depression/anxiety disorders was increased for mothers, who from prepregnancy to 6 months postpartum experienced either weight loss >1 BMI unit (HR 1.19 [95% CI 1.06-1.25]), weight gain of 2-3 BMI units (HR 1.23 [95% CI 1.08-1.40]), or weight gain of =3 BMI units (HR 1.21 [95% CI 1.05-1.40]).
Causal direction and mechanisms behind the associations are largely unknown.
Low prepregnancy body weight and postpartum weight gain or loss are associated with occurrence of depression and anxiety disorders.
PubMed ID
26047960 View in PubMed
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Passive smoking in relation to lung cancer incidence and histologic types in Norwegian adults: the HUNT study.

https://arctichealth.org/en/permalink/ahliterature297954
Source
Eur Respir J. 2017 10; 50(4):
Publication Type
Letter
Research Support, Non-U.S. Gov't
Date
10-2017

Smoking, physical exercise, BMI and late foetal death: a study within the Danish National Birth Cohort.

https://arctichealth.org/en/permalink/ahliterature288085
Source
Eur J Epidemiol. 2016 Oct;31(10):999-1009
Publication Type
Article
Date
Oct-2016
Author
Maria Morales-Suárez-Varela
Ellen A Nohr
Bodil H Bech
Chunsen Wu
Jørn Olsen
Source
Eur J Epidemiol. 2016 Oct;31(10):999-1009
Date
Oct-2016
Language
English
Publication Type
Article
Keywords
Adult
Body mass index
Denmark - epidemiology
Exercise
Fathers - statistics & numerical data
Female
Fetal Death - etiology
Humans
Mothers - statistics & numerical data
Pregnancy
Pregnancy Complications - epidemiology
Registries
Risk factors
Smoking - adverse effects
Young Adult
Abstract
The aim of this paper was to estimate the effect of maternal and paternal smoking on foetal death (miscarriage and stillbirth) and to estimate potential interactions with physical exercise and pre-pregnancy body mass index. We selected 87,930 pregnancies from the population-based Danish National Birth Cohort. Information about lifestyle, occupational, medical and obstetric factors was obtained from a telephone interview and data on pregnancy outcomes came from the Danish population based registries. Cox regression was used to estimate the hazard ratios (adjusted for potential confounders) for predominantly late foetal death (miscarriage and stillbirth). An interaction contrast ratio was used to assess potential effect measure modification of smoking by physical exercise and body mass index. The adjusted hazard ratio of foetal death was 1.22 (95 % CI 1.02-1.46) for couples where both parents smoked compared to non-smoking parents (miscarriage: 1.18, 95 % CI 0.96-1.44; stillbirth: 1.32, 95 % CI 0.93-1.89). On the additive scale, we detected a small positive interaction for stillbirth between smoking and body mass index (overweight women). In conclusion, smoking during pregnancy was associated with a slightly higher hazard ratio for foetal death if both parents smoked. This study suggests that smoking may increase the negative effect of a high BMI on foetal death, but results were not statistically significant for the interaction between smoking and physical exercise.
Notes
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