Mental Disorders Among Offspring Prenatally Exposed to Systemic Glucocorticoids.

Importance: Current evidence of the association between prenatal exposure to glucocorticoids and long-term mental disorders is scarce and has limitations.

Objective: To investigate the association between prenatal exposure to systemic glucocorticoids and mental disorders in offspring at the age of 15 years, comparing exposed vs unexposed offspring born to mothers with the same underlying disease (risk of preterm delivery and autoimmune or inflammatory disorders).

Design, Setting, And Participants: This nationwide population-based cohort study used data from registries in Denmark with follow-up until December 31, 2018.

Paediatric reference intervals for haematology parameters analysed on Sysmex XN-9000: a comparison of methods in the framework of indirect sampling.

Objectives: To provide age- and sex-specific paediatric reference intervals (RIs) for 13 haematological parameters analysed on Sysmex XN-9000 and compare different methods for estimating RIs after indirect sampling.

Methods: Via the Danish Laboratory Information System, we conducted a population-based study. We identified samples from children aged 0-18 years analysed at Aarhus University Hospital from 2019 to 2023, including samples from general practitioners only.

Novel Approach for Treating Diabetes in a Patient With the Heterozygous Pathogenic Variant R46Q in the Insulin Gene.

Maturity-onset diabetes of the young (MODY) is a monogenic disorder of glucose homeostasis with several subtypes, each defined by a distinct genetic etiology. Heterozygous pathogenic variants in the insulin gene are rare causes of MODY, and optimal treatment strategies remain uncertain. Herein we describe a patient with diabetes caused by the heterozygous pathogenic variant R46Q in the insulin gene and the glycemic response to selected antidiabetic treatment regimens.

Risk of mortality and recurrence after first-time stroke among patients with type 2 diabetes: A Danish nationwide cohort study.

Introduction: The prognosis for stroke patients with type 2 diabetes mellitus (T2DM) remains poorly understood. We examined the risk of mortality and stroke recurrence in stroke patients with T2DM and stroke patients without diabetes.

Patients And Methods: We conducted a population-based cohort study including all patients diagnosed with a first-time ischemic stroke ( = 131,594) or intracerebral hemorrhage (ICH,  = 15,492) in Denmark, 2005-2021.

Trends in the Use of Medications for Secondary Ischemic Stroke Prevention in Denmark, 2005-2021.

Background And Objectives: Understanding trends in the use of medications for secondary stroke prevention is crucial for identifying areas for improvement in stroke care. We examined the use of lipid-lowering, antihypertensive, glucose-lowering, oral anticoagulant, and antiplatelet medications after ischemic stroke hospitalization, from 2005 to 2021.

Methods: Using nationwide registries in Denmark, we identified a cohort of patients discharged from hospital with a first-time or recurrent ischemic stroke (N = 150,744).

Directed acyclic graphs in clinical research.

Directed acyclic graphs (DAGs), or causal diagrams, are graphical representations of causal structures that can be used in medical research to understand and illustrate potential bias, including bias arising from confounding, selection, and misclassification. Further, they provide guidance for researchers about how to address a potential bias.

Cohort Profile: Better Health in Late Life.

Purpose: Humans are living longer and may develop multiple chronic diseases in later life. The Better Health in Late Life cohort study aims to improve our understanding of the risks and outcomes of multimorbidity in the Danish population.

Methods: A randomly-selected sample of Danish residents who were 50-65 years of age received a questionnaire and an invitation to participate in this study.

Overweight or obesity in children born after assisted reproductive technologies in Denmark: A population-based cohort study.

Background: The association between assisted reproductive technologies (ARTs) and the body mass index (BMI) of children remains controversial. Confounding by morbidity and other factors associated with parental infertility may have biased studies comparing children born after ART with children born after no treatment. We investigated the associations between different fertility treatments and BMI in children at age 5 to 8 years, adjusting for and stratifying by causes of parental infertility.

Risk of Depression after Venous Thromboembolism in Patients with Hematological Cancer: A Population-Based Cohort Study.

Background:  Venous thromboembolism (VTE) may complicate the clinical course of cancer patients and add to their psychological burden.

Objectives:  We aimed to investigate the association between VTE and risk of subsequent depression in patients with hematological cancer.

Patients And Methods:  We conducted a population-based cohort study using Danish national health registries.

Comorbidities and mortality among patients with chronic obstructive pulmonary disease.

Introduction: Comorbidities are common in patients with chronic obstructive pulmonary disease (COPD). Estimates of prevalence, incidence and prognostic impact of comorbidities provide foundational knowledge of COPD epidemiology. We examined the prevalence, incidence and prognostic impact of 21 comorbidities among patients with COPD compared with the Danish general population.

Mental Health Conditions Among Children and Adolescents With Congenital Heart Disease: A Danish Population-Based Cohort Study.

Background: Despite the known mental health burden among children with congenital heart disease (CHD), the literature is constrained by a lack of comparison cohorts and population-based follow-up data. We examined the incidence of mental health conditions among children with CHD, relative to 3 comparison cohorts.

Methods: This population-based cohort study identified all children with CHD (<18 years of age; n=16 473) in Denmark from 1996 to 2017, through linkage of individual-level data across national registries.

A Review of Major Danish Biobanks: Advantages and Possibilities of Health Research in Denmark.

Biobank research may lead to an improved understanding of disease etiology and advance personalized medicine. Denmark (population ~5.9 million) provides a unique setting for population-based health research.

Maternal Smoking During Pregnancy and Risk of Appendicitis in the Offspring.

Background: Existing evidence on the link between smoking and appendicitis is scarce and ambiguous. We therefore conducted a population-based cohort study in Denmark to investigate whether smoking during pregnancy is associated with an increased risk of appendicitis in offspring.

Methods: We used the Danish Birth Registry to include all singletons born during 1991-2017 and to identify maternal smoking status during pregnancy.

Venous thromboembolism and risk of depression: a population-based cohort study.

Background: The psychologic consequences of acute venous thromboembolism (VTE) have not been investigated in depth.

Objectives: We aimed to examine the association between VTE and the risk of subsequent depression.

Methods: Using Danish nationwide registries, we established a population-based cohort of 64 596 individuals with incident VTE during 1996 to 2016 and a comparison cohort (n = 322 999) selected randomly from the general population and individually matched by birth year, sex, and calendar year of VTE.

Cancer Diagnosis and Prognosis After Guillain-Barré Syndrome: A Population-Based Cohort Study.

Introduction: It is unclear whether Guillain-Barré syndrome (GBS) can be a marker of a paraneoplastic syndrome. We examined whether GBS is associated with cancer and whether the prognosis of GBS patients with cancer differs from that of other cancer patients.

Materials And Methods: We conducted a population-based cohort study of patients diagnosed with GBS between 1978 and 2017 using Danish registry-data.

In utero exposure to glucocorticoids and risk of anxiety and depression in childhood or adolescence.

Glucocorticoid use is prevalent in pregnant women, but whether in utero exposure impacts mental health in the offspring has not been fully explored. The aim of this study was to investigate if in utero exposure to synthetic glucocorticoids increases the risk of anxiety and depression in childhood or adolescence. The study was conducted as a nationwide cohort study, including negative control exposure analyses and a sibling design to optimize control of confounding.

The Interaction Between Venous Thromboembolism and Socioeconomic Status on the Risk of Disability Pension.

Background: Venous thromboembolism (VTE) is associated with increased risk of disability pension. How socioeconomic status (SES) impacts the risk of disability pension after a VTE is unknown. The aim of this nationwide population based cohort study to investigate the interaction between SES and incident VTE on the risk of subsequent disability pension.

Prenatal Antidepressant Exposure and the Risk of Attention-deficit/Hyperactivity Disorder in Childhood: A Cohort Study With Triangulation.

Background: Uncontrolled confounding from maternal depression and genetic and environmental factors is expected in studies investigating the effect of prenatal antidepressant exposure on the risk of attention-deficit/hyperactivity disorder (ADHD) in childhood and may explain inconsistencies in the existing evidence. We aimed to assess this effect using triangulation.

Methods: Using population-based health registries, we conducted a nationwide cohort study of all children born in Denmark between 1997 and 2017 and followed through 2018 for ADHD.

Cardiovascular events and all-cause mortality in patients with chronic obstructive pulmonary disease using olodaterol and other long-acting beta2-agonists.

Purpose: We examined the effect of olodaterol on the risk of myocardial ischaemia, cardiac arrhythmia, and all-cause mortality compared with use of other long-acting beta2-agonists (LABAs). Channelling bias was also explored.

Methods: This Danish population-based cohort study used data linked from registries of hospital diagnoses, outpatient dispensings, and deaths.

Cancer Risk in Pulmonary Hypertension Patients.

Background: Strong evidence indicates that venous thromboembolism is a presenting symptom of cancer. Cancer is a known cause of pulmonary hypertension; however, it remains unknown whether pulmonary hypertension is a marker of occult cancer. We examined the association between a pulmonary hypertension diagnosis and cancer risk in a cohort study using population-based data from the Danish health system.

Prenatal exposure to glucocorticoids and the prevalence of overweight or obesity in childhood.

Objective: Prenatal exposure to excess cortisol can affect postnatal metabolic health by epigenetic mechanisms. We aimed to investigate if prenatal exposure to pharmacological glucocorticoids increases the risk of overweight/obesity in childhood.

Design: A nationwide population registry-based cohort study.

Socioeconomic status and risk of incident venous thromboembolism.

Background: Although venous thromboembolism (VTE) is a leading cause of morbidity and mortality, and socioeconomic status (SES) affects human health and health behavior, few studies have examined the association between SES and VTE.

Objectives: We aimed to investigate the association between SES, assessed individually and in a composite score by levels of education, income, and employment status, and incident VTE.

Methods: We used Danish national registries to identify 51 350 persons aged 25-65 years with incident VTE during 1995-2016.

Risk of a permanent work-related disability pension after incident venous thromboembolism in Denmark: A population-based cohort study.

Background: Long-term complications of venous thromboembolism (VTE) hamper physical function and impair quality of life; still, it remains unclear whether VTE is associated with risk of permanent work-related disability. We aimed to assess the association between VTE and the risk of receiving a permanent work-related disability pension and to assess whether this association was explained by comorbidities such as cancer and arterial cardiovascular disease.

Methods And Findings: A Danish nationwide population-based cohort study consisting of 43,769 individuals aged 25 to 66 years with incident VTE during 1995 to 2016 and 218,845 birth year-, sex-, and calendar year-matched individuals from the general population, among whom 45.

Nordic Health Registry-Based Research: A Review of Health Care Systems and Key Registries.

The Nordic countries are Denmark, Finland, Iceland, Norway, and Sweden and comprise a total population of approximately 27 million. The countries provide unique opportunities for joint health registry-based research in large populations with long and complete follow-up, facilitated by shared features, such as the tax-funded and public health care systems, the similar population-based registries, and the personal identity number as unique identifier of all citizens. In this review, we provide an introduction to the health care systems, key registries, and how to navigate the practical and ethical aspects of setting up such studies.