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1.  Prenatal Exposure to Bereavement and Type-2 Diabetes: A Danish Longitudinal Population Based Study 
PLoS ONE  2012;7(8):e43508.
Background
The etiology of type-2 diabetes is only partly known, and a possible role of prenatal stress in programming offspring for insulin resistance has been suggested by animal models. Previously, we found an association between prenatal stress and type-1 diabetes. Here we examine the association between prenatal exposure to maternal bereavement during preconception and pregnancy and development of type-2 diabetes in the off-spring.
Methods
We utilized data from the Danish Civil Registration System to identify singleton births in Denmark born January 1st 1979 through December 31st 2008 (N = 1,878,246), and linked them to their parents, grandparents, and siblings. We categorized children as exposed to bereavement during prenatal life if their mothers lost an elder child, husband or parent during the period from one year before conception to the child’s birth. We identified 45,302 children exposed to maternal bereavement; the remaining children were included in the unexposed cohort. The outcome of interest was diagnosis of type-2 diabetes. We estimated incidence rate ratios (IRRs) from birth using log-linear poisson regression models and used person-years as the offset variable. All models were adjusted for maternal residence, income, education, marital status, sibling order, calendar year, sex, and parents’ history of diabetes at the time of pregnancy.
Results
We found children exposed to bereavement during their prenatal life were more likely to have a type-2 diabetes diagnosis later in life (aIRR: 1.31, 1.01–1.69). These findings were most pronounced when bereavement was caused by death of an elder child (aIRR: 1.51, 0.94–2.44). Results also indicated the second trimester of pregnancy to be the most sensitive period of bereavement exposure (aIRR:2.08, 1.15–3.76).
Conclusions
Our data suggests that fetal exposure to maternal bereavement during preconception and the prenatal period may increase the risk for developing type-2 diabetes in childhood and young adulthood.
doi:10.1371/journal.pone.0043508
PMCID: PMC3429491  PMID: 22952698
2.  The 5-minute Apgar score as a predictor of childhood cancer: a population-based cohort study in five million children 
BMJ Open  2012;2(4):e001095.
Objective
The aetiology of childhood cancer remains largely unknown but recent research indicates that uterine environment plays an important role. We aimed to examine the association between the Apgar score at 5 min after birth and the risk of childhood cancer.
Design
Nationwide population-based cohort study.
Setting
Nationwide register data in Denmark and Sweden.
Study population
All live-born singletons born in Denmark from 1978 to 2006 (N=1 771 615) and in Sweden from 1973 to 2006 (N=3 319 573). Children were followed up from birth to 14 years of age.
Main outcome measures
Rates and HRs for all childhood cancers and for specific childhood cancers.
Results
A total of 8087 children received a cancer diagnosis (1.6 per 1000). Compared to children with a 5-min Apgar score of 9–10, children with a score of 0–5 had a 46% higher risk of cancer (adjusted HR 1.46, 95% CI 1.15 to 1.89). The potential effect of low Apgar score on overall cancer risk was mostly confined to children diagnosed before 6 months of age. Children with an Apgar score of 0–5 had higher risks for several specific childhood cancers including Wilms’ tumour (HR 4.33, 95% CI 2.42 to 7.73).
Conclusions
A low 5 min Apgar score was associated with a higher risk of childhood cancers diagnosed shortly after birth. Our data suggest that environmental factors operating before or during delivery may play a role on the development of several specific childhood cancers.
doi:10.1136/bmjopen-2012-001095
PMCID: PMC3425910  PMID: 22874628
Oncology; Epidemiology; Paediatric oncology; Preventive Medicine
3.  Chronic care management in Danish general practice - a cross‒sectional study of workload and multimorbidity 
BMC Family Practice  2012;13:52.
Background
About 30% of the Danish population has one or more chronic conditions, and general practitioners (GPs) play a key role in effective chronic care management. However, little is known about these encounters in general practice. The aim was to describe the frequency of patients with one or more chronic conditions in general practice and how these consultations were experienced by the GPs.
Methods
All GPs in the Central Denmark Region were invited to register all contacts during one day in the 12‒month study period from December; 404 (46%) accepted. For each patient contact, the GPs were asked to fill in a one‒page registration form covering information on chronic disease, reason for encounter, diagnosis, number of additional psychosocial problems raised by the patient during the consultation, time consumption, experienced burden of the consultation, referral to specialized care, and whether a nurse could have substituted the GP. Patients were categorized according to the number of chronic conditions (none, one, two, three or more) and the categories compared with regard to the GP‒experienced burden of the contacts. Moreover, we examined which chronic conditions posed the the greatest challenge to the GPs.
Results
Patients aged 40 years or more had a total of 8,236 contacts. Among these patients 2,849 (34.6%; 95% CI 33.6‒35.6) had one and 2,596 (31.5%; CI 30.5‒32.5) had more than one chronic disease. The time consumption and the burden of their contacts tended to rise with the number of chronic conditions. Being present in 22.9% (CI 21.6‒24.3) of all face‒to‒face contacts, hypertension was the most common chronic condition. The burden of the contacts was experienced as particularly heavy for patients with depression and dementia due to more additional psychosocial problems and the time consumption.
Conclusion
General practitioners considered consultations with multimorbid patients demanding and not easily delegated to nurses. As the number of patients with chronic conditions and multimorbidity is increasing, GPs can be expected to face a heavier workload in the future.
doi:10.1186/1471-2296-13-52
PMCID: PMC3436724  PMID: 22676446
Primary care; Chronic disease; Multimorbidity; Workload
4.  Long-Term Health Outcomes in Children Born to Mothers with Diabetes: A Population-Based Cohort Study 
PLoS ONE  2012;7(5):e36727.
Background
To examine whether prenatal exposure to parental type 1 diabetes, type 2 diabetes, or gestational diabetes is associated with an increased risk of malignant neoplasm or diseases of the circulatory system in the offspring.
Methods/Principal Findings
We conducted a population-based cohort study of 1,781,576 singletons born in Denmark from 1977 to 2008. Children were followed for up to 30 years from the day of birth until the onset of the outcomes under study, death, emigration, or December 31, 2009, whichever came first. We used Cox proportional hazards model to estimate hazard ratios (HR) with 95% confidence intervals (95% CI) for the outcomes under study while adjusting for potential confounders. An increased risk of malignant neoplasm was found in children prenatally exposed to maternal type 2 diabetes (HR = 2.2, 95%CI: 1.5–3.2). An increased risk of diseases of the circulatory system was found in children exposed to maternal type 1 diabetes (HR = 2.2, 95%CI: 1.6–3.0), type 2 diabetes (HR = 1.4, 95%CI: 1.1–1.7), and gestational diabetes (HR = 1.3, 95%CI: 1.1–1.6), but results were attenuated after excluding children with congenital malformations. An increased risk of diseases of the circulatory system was also found in children exposed to paternal type 2 diabetes (HR = 1.5, 95%CI: 1.1–2.2) and the elevated risk remained after excluding children with congenital malformations.
Conclusions
This study suggests that susceptibility to malignant neoplasm is modified partly by fetal programming. Diseases of the circulatory system may be modified by genetic factors, other time-stable family factors, or fetal programming.
doi:10.1371/journal.pone.0036727
PMCID: PMC3359312  PMID: 22649497

Results 1-4 (4)