Publications by authors named "Unnur A Valdimarsdottir"

Perinatal mental disorders are common, yet few robust risk factors are known. Stressful life events such as loss of a close family member due to death could serve as potential clinical predictors for which mothers develop perinatal mental disorders. This study investigated the association between bereavement and the risk of first-onset perinatal mental disorders.

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Background: Pre-existing comorbidities are linked to increased risk of severe COVID-19, but comprehensive assessments of comorbidity patterns remain limited.

Methods: We used network analysis to identify pre-existing comorbidity modules (i.e.

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This exploratory study aimed to examine whether gender and care-seeking behaviors were associated with the frequency of adverse mental health symptoms during the COVID-19 pandemic based on the longitudinal Omtanke2020 Study in Sweden (N = 27,562). The study was performed using self-reported data from adult volunteers through online surveys. Descriptive network analysis was used to explore the cross-sectional relationships between gender, care-seeking behavior, and symptoms of depression, anxiety, and COVID-19-related distress at baseline as well as 6-month and 12-month follow-ups.

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Depression is strongly associated with a range of subsequent diseases. To elucidate key mechanistic pathways for targeted interventions, this study aimed to determine the main disease networks associated with depression as well as their underlying genetic determinants. We developed a novel three-dimensional network approach which refines disease association verification by incorporating regularized partial correlations, and facilitates robust identification and visualization of disease clusters (i.

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Several lines of evidence indicate a potential link between premenstrual disorders (PMDs) and cardiovascular diseases (CVDs). However, it remains unclear whether women with PMDs have a higher risk of CVDs. Here we present a Swedish nationwide population-based matched cohort study from 2001 to 2022 and a sibling matched cohort to address familial confounding.

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Importance: Childhood bereavement increases the risk of common psychiatric disorders later in life. However, the role of stress resilience in this association remains underexplored.

Objective: To assess whether stress resilience mediates the association between childhood bereavement and psychiatric disorder risk in adulthood.

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Background: Premenstrual disorders (PMDs) are prevalent and impair women's quality of life, but their long-term influence on work capacity is unclear. Understanding the association between PMDs and subsequent sick leave and unemployment could inform interventions and policies.

Objective: We hypothesised that women with PMDs have an increased risk of future sick leave and unemployment compared with those without PMDs.

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We aimed to examine the association between adverse childhood experiences (ACEs) and type 2 diabetes in a nationwide cohort of Icelandic women, and to assess the mechanisms through which it is mediated. We used cross-sectional data from the nationwide-representative Stress-And-Gene-Analysis cohort, including 26 952 Icelandic women aged 18-69 years who self-reported exposure to 13 types of ACEs and adult diagnosis of type 2 diabetes. Modified Poisson regression was used to quantify the association between ACEs and type 2 diabetes, adjusting for age and childhood deprivation.

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Importance: Clinical diagnoses of psychiatric disorders are associated with cardiometabolic diseases (CMDs) such as type 2 diabetes and ischemic heart diseases. Studying how genetic liability for psychiatric disorders relate to CMD risk will offer novel insight into the relationship between psychiatric disorders and CMDs.

Objective: To evaluate the associations between psychiatric polygenic risk scores (PRSs) and clinically diagnosed CMDs while accounting for cross-disorder pleiotropy.

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Background: Adverse childhood experiences (ACEs) have been associated with increased risks of autoimmune diseases. However, data are scarce on the role of specific ACEs as well as the potential mediating role of adverse mental health symptoms in this association.

Methods: A cohort study using the nationwide Icelandic Stress-And-Gene-Analysis (SAGA, 22,423 women) cohort and the UK Biobank (UKB, 86,492 women) was conducted.

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Background: Limited studies exist on sex differences in incidence rates of psychiatric disorders across the lifespan. This study aims to analyze sex differences in the incidence rates of clinically diagnosed psychiatric disorders over the lifespan.

Methods: We conducted a nationwide register-based cohort study, including all individuals who were born in Sweden and lived in Sweden between 2003 and 2019, including 4,818,071 females and 4,837,829 males.

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Importance: Comprehensive data on the prevalence of various life stressors and their role in posttraumatic stress disorder (PTSD) among women are lacking.

Objective: To determine the prevalence of a broad range of life stressors and their association with PTSD in a large nationally representative cohort of women.

Design, Setting, And Participants: This cross-sectional analysis used data from the population-based Stress-And-Gene-Analysis, which invited women in Iceland to complete an online survey from March 1, 2018, to July 1, 2019.

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Article Synopsis
  • - Individuals with mental illness are at a higher risk for severe COVID-19 outcomes, but studies on their vaccination uptake have shown mixed results.
  • - This research analyzed data from multiple cohort studies and Swedish registers to explore the relationship between mental illness and COVID-19 vaccination rates.
  • - Findings revealed that while overall vaccine uptake was high in both groups, there was a slight decrease in vaccination rates among unmedicated individuals with mental illness, indicating a need for further investigation into this subgroup.
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  • The study investigates the link between inflammatory markers in blood and the risk of perinatal depression (PND) in women, a significant health issue affecting many during childbirth.
  • This prospective cohort study included 4,483 women and found that a higher platelet-to-lymphocyte ratio (PLR) increases the risk of PND, while a higher lymphocyte count decreases it, with these relationships being stronger for postpartum depression.
  • The findings highlight the potential of using pre-pregnancy inflammatory markers to predict the risk of PND, suggesting a need for further research into the biological mechanisms involved.
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  • - MDD and CVD commonly occur together, leading to higher health risks, and they share many genetic risk factors, with notable genetic overlaps found in specific brain regions like the thalamus.
  • - The research identified seven genetic loci linked to both disorders and highlighted that factors like inflammation and lifestyle contribute to the shared risk between MDD and atherosclerotic CVD.
  • - The findings suggest that genetic predisposition to MDD increases the risk of CVD, while the reverse is less evident, indicating a specific immunometabolic subtype of MDD that may be targeted for better prevention of CVD.
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Importance: Individuals with psychiatric disorders have been reported to have elevated levels of inflammatory biomarkers, and prospective evidence is limited regarding the association between inflammatory biomarkers and subsequent psychiatric disorders risk.

Objective: To assess the associations between inflammation biomarkers and subsequent psychiatric disorders risk.

Design, Setting, And Participants: This was a prospective cohort study including individuals from the Swedish Apolipoprotein Mortality Risk (AMORIS) cohort, with no prior psychiatric diagnoses and having a measurement of at least 1 inflammatory biomarker.

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Background: Premenstrual disorders (PMDs) affect women's quality of life, yet the impact on romantic relationships remains unclear. This study aimed to examine the association between severe PMDs and relationship disruption and initiation.

Methods: We conducted a prospective cohort study of 15,606 women during 2009-2021 in Sweden.

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Article Synopsis
  • Childhood maltreatment (CM) impacts health across one's life, and this study investigates its role in severe COVID-19 outcomes among 151,427 participants in the UK Biobank.
  • * The study found that individuals with a history of CM had a significantly higher risk of hospitalization or death from COVID-19, with physical neglect being the most impactful type.
  • * Results indicated that socio-economic status, lifestyle, and pre-existing health conditions explained over half of the link between CM and severe COVID-19 outcomes, while CM was less strongly tied to COVID-19 diagnosis and vaccine uptake.
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Background And Aims: Increasing evidence suggests that some reproductive factors/hazards are associated with a future risk of cardiovascular disease (CVD) in women. While major (non-perinatal) depression has consistently been associated with CVD, the long-term risk of CVD after perinatal depression (PND) is largely unknown.

Methods: A nationwide population-based matched cohort study involving 55 539 women diagnosed with PND during 2001-14 in Sweden and 545 567 unaffected women individually matched on age and year of conception/delivery was conducted.

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Mental disorders are leading causes of disability and premature death worldwide, partly due to high comorbidity with cardiometabolic disorders. Reasons for this comorbidity are still poorly understood. We leverage nation-wide health records and near-complete genealogies of Denmark and Sweden (n = 17 million) to reveal the genetic and environmental contributions underlying the observed comorbidity between six mental disorders and 15 cardiometabolic disorders.

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Background: Workplace sexual violence against women is a pressing global issue with scarce knowledge on its health implications. Existing research is largely limited to specific occupations, which calls for comprehensive, population-based studies. This study aimed to examine the associations between self-labelled workplace sexual violence and a variety of health outcomes in a nationally representative sample of Icelandic women aged 18-69 years.

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Importance: Premenstrual disorders (PMDs) adversely affect the quality of life of millions of women worldwide, yet research on the long-term consequences of PMDs is limited, and the risk of mortality has not been explored.

Objective: To estimate the associations of PMDs with overall and cause-specific mortality.

Design, Setting, And Participants: This nationwide, population-based, matched cohort study used data from population and health registers in Sweden.

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Pre-existing psychiatric disorders were linked to an increased susceptibility to COVID-19 during the initial outbreak of the pandemic, while evidence during Omicron prevalence is lacking. Leveraging data from two prospective cohorts in China, we identified incident Omicron infections between January 2023 and April 2023. Participants with a self-reported history or self-rated symptoms of depression or anxiety before the Omicron pandemic were considered the exposed group, whereas the others were considered unexposed.

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Background: Premenstrual disorders (PMDs) and perinatal depression (PND) share symptomology and the timing of symptoms of both conditions coincide with natural hormonal fluctuations, which may indicate a shared etiology. Yet, there is a notable absence of prospective data on the potential bidirectional association between these conditions, which is crucial for guiding clinical management. Using the Swedish nationwide registers with prospectively collected data, we aimed to investigate the bidirectional association between PMDs and PND.

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