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Korsgaard S, Troelsen FS, Veres K, Fuglsang CH, Sørensen HT. Evaluation of Left Truncation and Censoring When Changing the Use of the International Classification of Diseases Eighth Revision Codes to Tenth Revision Codes in the Danish National Patient Registry. Clin Epidemiol 2024; 16:319-327. [PMID: 38783995 PMCID: PMC11114138 DOI: 10.2147/clep.s456171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 05/02/2024] [Indexed: 05/25/2024] Open
Abstract
Purpose In the Danish National Patient Registry (DNPR), covering all Danish hospitals and widely used in research, diseases have been recorded using International Classification of Diseases (ICD) codes, transitioning from the Eighth to the Tenth revision in 1994. Uncertainty exists regarding whether including ICD-8 codes alongside ICD-10 is needed for complete disease identification. We assessed the extent of left-truncation and left-censoring in the DNPR arising from omitting ICD-8 codes. Patients and Methods We sampled 500,000 Danes ≥40 years of age in 1995, 2010, and 2018. From the DNPR, we identified cardiovascular, endocrine, gastrointestinal, neurological, pulmonary, rheumatic, and urogenital diseases as well as fractures. We obtained the number of people with a disease recorded with ICD-8 codes only (ie, the ICD-8 record would be left-truncated by not using ICD-8 codes), ICD-8 plus ICD-10 codes (ie, the ICD-8 record would be left-censored by not using ICD-8 codes), and ICD-10 codes only. For each ICD group, we calculated the proportion of people with the disease relative to the total sample (ie, 500,000 people) and the total number of people with the disease across all ICD groups. Results Overall, the left-truncation issue decreased over the years. Relative to all people with a disease, the left-truncated proportion was for example 59% in 1995 and <2% in 2018 for diabetes mellitus; 93% in 1995, and 54% in 2018 for appendicitis. The left-truncation issue increased with age group for most diseases. The proportion of disease records left-censored by not using ICD-8 codes was generally low but highest for chronic diseases. Conclusion The left-truncation issue diminished over sample years, particularly for chronic diseases, yet remained rather high for selected surgical diseases. The left-truncation issue increased with age group for most diseases. Left-censoring was overall a minor issue that primarily concerned chronic diseases.
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Affiliation(s)
- Søren Korsgaard
- Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Aarhus, Denmark
| | | | - Katalin Veres
- Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Aarhus, Denmark
| | | | - Henrik Toft Sørensen
- Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Aarhus, Denmark
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Skajaa N, Farkas DK, Laugesen K, Fuglsang CH, Henderson VW, Plana-Ripoll O, Gaist D, Sørensen HT. Mental Health Conditions in Partners and Adult Children of Stroke Survivors. JAMA Netw Open 2024; 7:e243286. [PMID: 38483386 PMCID: PMC10940969 DOI: 10.1001/jamanetworkopen.2024.3286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 01/29/2024] [Indexed: 03/17/2024] Open
Abstract
Importance Family caregiving after critical illness has been associated with several adverse health outcomes, including various aspects of mental health, but research focusing specifically on family members of stroke survivors is limited. Objectives To examine the associations of stroke in a partner or parent with the risk of depression, substance use disorders, anxiety disorders, and self-harm or suicide. Design, Setting, and Participants This nationwide, population-based cohort study used data from Danish nationwide administrative and clinical registries (2004-2021). Participants included partners and adult children of survivors of stroke. Data analysis was performed from March to December 2023. Exposure Having a partner or parent who survived stroke. Main Outcomes and Measures The Aalen-Johansen estimator was used to compute propensity score-weighted 3-year absolute risks, risk differences, and risk ratios for depression, substance use disorders, anxiety disorders, and self-harm or suicide among partners or children of survivors of stroke compared with partners or children of survivors of myocardial infarction (MI) and matched individuals from the general population. Results The study included a total of 1 923 732 individuals: 70 917 partners of stroke survivors (median [IQR] age, 68 [59-76] years; 46 369 women [65%]), 70 664 partners of MI survivors (median [IQR] age, 65 [55-73] years; 51 849 women [73%]), 354 570 partners of individuals from the general population (median [IQR] age, 68 [59-76] years; 231 833 women [65%]), 207 386 adult children of stroke survivors (median [IQR] age, 45 [36-52] years; 99 382 women [48%]), 183 309 adult children of MI survivors (median [IQR] age, 42 [33-49] years; 88 078 women [48%]), and 1 036 886 adult children of individuals from the general population (median [IQR] age, 45 [36-52] years; 496 875 women [48%]). Baseline characteristics were well balanced across cohorts after propensity score weighting. Among partners of stroke survivors, the 3-year absolute risk was 1.0% for depression, 0.7% for substance use disorders, 0.3% for anxiety disorders, and 0.04% for self-harm or suicide. Risk ratio point estimates for the assessed outcomes ranged from 1.14 to 1.42 compared with the general population and from 1.04 to 1.09 compared with partners of MI survivors. The elevated risk of depression in partners of stroke survivors was more pronounced after severe or moderate stroke than after mild stroke. Among adult children of stroke survivors, the 3-year absolute risk was 0.6% for depression, 0.6% for substance use disorders, 0.2% for anxiety disorders, and 0.05% for self-harm or suicide. Both absolute risks and risk ratios for adult children of stroke survivors were smaller than those reported in the partner analyses. Conclusions and Relevance In this cohort study of partners and adult children of stroke survivors, risks of several mental health conditions and self-harm or suicide were moderately higher compared with the general population and, to a lesser extent, partners and adult children of MI survivors. These findings highlight the potential consequences of stroke among family members, particularly partners, and its findings may possibly serve as a quantitative foundation for the development of future stroke rehabilitation services.
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Affiliation(s)
- Nils Skajaa
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - Dóra Körmendiné Farkas
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - Kristina Laugesen
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - Cecilia Hvitfeldt Fuglsang
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - Victor W. Henderson
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
- Department of Epidemiology & Population Health, Stanford University, Stanford, California
- Department of Neurology & Neurological Sciences, Stanford University, Stanford, California
| | - Oleguer Plana-Ripoll
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - David Gaist
- Research Unit for Neurology, Odense University Hospital and University of Southern Denmark, Odense, Denmark
| | - Henrik Toft Sørensen
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
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Fuglsang CH, Pedersen L, Schmidt M, Vandenbroucke JP, Bøtker HE, Sørensen HT. Correction: Migraine and risk of premature myocardial infarction and stroke among men and women: A Danish population-based cohort study. PLoS Med 2024; 21:e1004353. [PMID: 38350041 PMCID: PMC10864029 DOI: 10.1371/journal.pmed.1004353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/15/2024] Open
Abstract
[This corrects the article DOI: 10.1371/journal.pmed.1004238.].
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Fuglsang CH, Pedersen L, Schmidt M, Vandenbroucke JP, Bøtker HE, Sørensen HT. Combined Impact of Migraine and Pregnancy-Induced Hypertension on Long-term Risk of Premature Myocardial Infarction and Stroke. Neurology 2024; 102:e207813. [PMID: 38165376 PMCID: PMC10834138 DOI: 10.1212/wnl.0000000000207813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 08/10/2023] [Indexed: 01/03/2024] Open
Abstract
BACKGROUND AND OBJECTIVES Migraine and pregnancy-induced hypertension (PIH) are known to increase cardiovascular risk on their own. However, evidence is limited on the combined impact of migraine and PIH on risk of cardiovascular disease. The aim of this study was to examine the combined impact of migraine and PIH on risk of premature (age 60 years and younger) major adverse cardiovascular and cerebrovascular events (MACCE), a composite end point consisting of myocardial infarction, stroke, or death due to one of these diseases. METHODS We conducted a population-based cohort study in Denmark (1996-2018) among women who had delivered at least one child. This population was stratified into 4 cohorts: women with neither migraine nor PIH, women with migraine, women with PIH, and women with both migraine and PIH. As a measure of absolute risk, we computed the 20-year cumulative incidence of premature MACCE, treating death by other causes than myocardial infarction and stroke as a competing risk. We used Cox regression to compute 20-year adjusted hazard ratios (HRs) of premature MACCE. Women with neither migraine nor PIH served as the comparison cohort. RESULTS The 20-year absolute risk of premature MACCE was 1.3% (95% CI 1.2%; 1.3%) for women without migraine and without PIH (n = 1,288,541), 2.2% (95% CI 2.0%; 2.4%) for women with migraine (n = 54,827), 2.8% (95% CI 2.6%; 3.1%) for women with PIH (n = 49,008), and 3.1% (95% CI 2.1%; 4.4%) for women with both migraine and PIH (n = 3,140). The adjusted HR of premature MACCE was 1.66 (95% confidence interval [CI] 1.50-1.84) for women with migraine, 2.76 (95% CI 2.52-3.03) for women with PIH, and 2.41 (95% CI 1.61-3.61) for women with both migraine and PIH. DISCUSSION Migraine and PIH separately increased the risk of premature MACCE. The risk of premature MACCE among women who had both migraine and PIH was similar to that among women with PIH only.
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Affiliation(s)
- Cecilia Hvitfeldt Fuglsang
- From the Department of Clinical Epidemiology (C.H.F., L.P., M.S., H.T.S.), Aarhus University Hospital; Department of Clinical Medicine (C.H.F., L.P., M.S., J.V., H.T.S.), Aarhus University; Department of Cardiology (M.S.), Aarhus University Hospital, Denmark; Leiden University Medical Center (J.V.), Leiden, The Netherlands; London School of Hygiene and Tropical Medicine (J.V.), University of London; Faculty of Health (H.E.B.), Aarhus University; and Department of Cardiology (H.E.B.), Aarhus University Hospital, Denmark
| | - Lars Pedersen
- From the Department of Clinical Epidemiology (C.H.F., L.P., M.S., H.T.S.), Aarhus University Hospital; Department of Clinical Medicine (C.H.F., L.P., M.S., J.V., H.T.S.), Aarhus University; Department of Cardiology (M.S.), Aarhus University Hospital, Denmark; Leiden University Medical Center (J.V.), Leiden, The Netherlands; London School of Hygiene and Tropical Medicine (J.V.), University of London; Faculty of Health (H.E.B.), Aarhus University; and Department of Cardiology (H.E.B.), Aarhus University Hospital, Denmark
| | - Morten Schmidt
- From the Department of Clinical Epidemiology (C.H.F., L.P., M.S., H.T.S.), Aarhus University Hospital; Department of Clinical Medicine (C.H.F., L.P., M.S., J.V., H.T.S.), Aarhus University; Department of Cardiology (M.S.), Aarhus University Hospital, Denmark; Leiden University Medical Center (J.V.), Leiden, The Netherlands; London School of Hygiene and Tropical Medicine (J.V.), University of London; Faculty of Health (H.E.B.), Aarhus University; and Department of Cardiology (H.E.B.), Aarhus University Hospital, Denmark
| | - Jan P Vandenbroucke
- From the Department of Clinical Epidemiology (C.H.F., L.P., M.S., H.T.S.), Aarhus University Hospital; Department of Clinical Medicine (C.H.F., L.P., M.S., J.V., H.T.S.), Aarhus University; Department of Cardiology (M.S.), Aarhus University Hospital, Denmark; Leiden University Medical Center (J.V.), Leiden, The Netherlands; London School of Hygiene and Tropical Medicine (J.V.), University of London; Faculty of Health (H.E.B.), Aarhus University; and Department of Cardiology (H.E.B.), Aarhus University Hospital, Denmark
| | - Hans Erik Bøtker
- From the Department of Clinical Epidemiology (C.H.F., L.P., M.S., H.T.S.), Aarhus University Hospital; Department of Clinical Medicine (C.H.F., L.P., M.S., J.V., H.T.S.), Aarhus University; Department of Cardiology (M.S.), Aarhus University Hospital, Denmark; Leiden University Medical Center (J.V.), Leiden, The Netherlands; London School of Hygiene and Tropical Medicine (J.V.), University of London; Faculty of Health (H.E.B.), Aarhus University; and Department of Cardiology (H.E.B.), Aarhus University Hospital, Denmark
| | - Henrik Toft Sørensen
- From the Department of Clinical Epidemiology (C.H.F., L.P., M.S., H.T.S.), Aarhus University Hospital; Department of Clinical Medicine (C.H.F., L.P., M.S., J.V., H.T.S.), Aarhus University; Department of Cardiology (M.S.), Aarhus University Hospital, Denmark; Leiden University Medical Center (J.V.), Leiden, The Netherlands; London School of Hygiene and Tropical Medicine (J.V.), University of London; Faculty of Health (H.E.B.), Aarhus University; and Department of Cardiology (H.E.B.), Aarhus University Hospital, Denmark
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Bach F, Skajaa N, Esen BÖ, Fuglsang CH, Horváth-Puhó E, Sørensen HT, Adelborg K. High-intensity versus moderate-intensity statin treatment for patients with ischemic stroke: Nationwide cohort study. Eur Stroke J 2023; 8:1041-1052. [PMID: 37555324 PMCID: PMC10683733 DOI: 10.1177/23969873231193288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 07/18/2023] [Indexed: 08/10/2023] Open
Abstract
PURPOSE Guidelines recommend high-intensity statin treatment after ischemic stroke, but evidence is sparse on the effectiveness and safety of different statin treatment intensities. We examined effectiveness and safety outcomes among patients initiating high-intensity versus moderate-intensity statins after ischemic stroke. METHODS In this population-based new-user active-comparator cohort study, we used the Danish Stroke Registry, covering all Danish hospitals, to identify patients with a first-time ischemic stroke during 2012-2021. Using multiple Danish registries, patients who redeemed a statin prescription within 21 days after stroke admission were classified as high-intensity statin initiators or moderate-intensity statin initiators. Propensity score inverse probability of treatment weighting was used to balance patient characteristics. We used competing risk methods to compute 5 year risk differences (RDs) and Cox proportional hazards regression to compute 5 year hazard ratios (HRs) of stroke recurrence, myocardial infarction, heart failure, venous thromboembolism, and all-cause mortality (effectiveness outcomes) and diabetes, liver disease, and kidney disease (safety outcomes). RESULTS High-intensity (n = 13,032) and moderate-intensity (n = 14,355) statin initiators were identified. Risks of most examined effectiveness outcomes were comparable between statin intensities. There was no clear association between statin intensity and stroke recurrence (RD: 0.8% [95% CI: 0.1, 1.4], HR: 1.08 [95% CI: 0.96, 1.22]). All-cause mortality was slightly reduced among high-intensity statin initiators (RD: -1.1% [95% CI: -0.1, -2.1], HR: 0.93 [95% CI: 0.85, 1.01]. Risks of most safety outcomes were comparable between statin intensities, but high-intensity statin use was associated with an increased risk of diabetes (RD: 1.2% [95% CI: 0.4, 1.9], HR: 1.10 [95% CI: 1.00, 1.21]). DISCUSSION AND CONCLUSION Compared with initiation of moderate-intensity statins, initiation of high-intensity statins after ischemic stroke was associated with similar risks of most effectiveness and safety outcomes. However, mortality risk was reduced, and diabetes risk was increased.
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Affiliation(s)
- Frederikke Bach
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University & Aarhus University Hospital, Aarhus, Denmark
| | - Nils Skajaa
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University & Aarhus University Hospital, Aarhus, Denmark
| | - Buket Öztürk Esen
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University & Aarhus University Hospital, Aarhus, Denmark
| | - Cecilia Hvitfeldt Fuglsang
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University & Aarhus University Hospital, Aarhus, Denmark
| | - Erzsébet Horváth-Puhó
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University & Aarhus University Hospital, Aarhus, Denmark
| | - Henrik Toft Sørensen
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University & Aarhus University Hospital, Aarhus, Denmark
| | - Kasper Adelborg
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University & Aarhus University Hospital, Aarhus, Denmark
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Hvitfeldt Fuglsang C, Pedersen L, Schmidt M, Vandenbroucke JP, Bøtker HE, Sørensen HT. Migraine and risk of premature myocardial infarction and stroke among men and women: A Danish population-based cohort study. PLoS Med 2023; 20:e1004238. [PMID: 37310926 PMCID: PMC10263301 DOI: 10.1371/journal.pmed.1004238] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 04/26/2023] [Indexed: 06/15/2023] Open
Abstract
BACKGROUND Migraine carries risk of myocardial infarction (MI) and stroke. The risk of premature MI (i.e., among young adults) and stroke differs between men and women; previous studies indicate that migraine is mainly associated with an increased risk of stroke among young women. The aim of this study was to examine impact of migraine on the risk of premature (age ≤60 years) MI and ischemic/hemorrhagic stroke among men and women. METHODS AND FINDINGS Using Danish medical registries, we conducted a nationwide population-based cohort study (1996 to 2018). Redeemed prescriptions for migraine-specific medication were used to identify women with migraine (n = 179,680) and men with migraine (n = 40,757). These individuals were matched on sex, index year, and birth year 1:5 with a random sample of the general population who did not use migraine-specific medication. All individuals were required to be between 18 and 60 years old. Median age was 41.5 years for women and 40.3 years for men. The main outcome measures to assess impact of migraine were absolute risk differences (RDs) and hazard ratios (HRs) with 95% confidence intervals (CIs) of premature MI, ischemic, and hemorrhagic stroke, comparing individuals with migraine to migraine-free individuals of the same sex. HRs were adjusted for age, index year, and comorbidities. The RD of premature MI for those with migraine versus no migraine was 0.3% (95% CI [0.2%, 0.4%]; p < 0.001) for women and 0.3% (95% CI [-0.1%, 0.6%]; p = 0.061) for men. The adjusted HR was 1.22 (95% CI [1.14, 1.31]; p < 0.001) for women and 1.07 (95% CI [0.97, 1.17]; p = 0.164) for men. The RD of premature ischemic stroke for migraine versus no migraine was 0.3% (95% CI [0.2%, 0.4%]; p < 0.001) for women and 0.5% (95% CI [0.1%, 0.8%]; p < 0.001) for men. The adjusted HR was 1.21 (95% CI [1.13, 1.30]; p < 0.001) for women and 1.23 (95% CI [1.10, 1.38]; p < 0.001) for men. The RD of premature hemorrhagic stroke for migraine versus no migraine was 0.1% (95% CI [0.0%, 0.2%]; p = 0.011) for women and -0.1% (95% CI [-0.3%, 0.0%]; p = 0.176) for men. The adjusted HR was 1.13 (95% CI [1.02, 1.24]; p = 0.014) for women and 0.85 (95% CI [0.69, 1.05]; p = 0.131) for men. The main limitation of this study was the risk of misclassification of migraine, which could lead to underestimation of the impact of migraine on each outcome. CONCLUSIONS In this study, we observed that migraine was associated with similarly increased risk of premature ischemic stroke among men and women. For premature MI and hemorrhagic stroke, there may be an increased risk associated with migraine only among women.
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Affiliation(s)
| | - Lars Pedersen
- Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital, Aarhus, Denmark
| | - Morten Schmidt
- Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital, Aarhus, Denmark
- Department of Cardiology, Aarhus University Hospital, Aarhus, Denmark
| | - Jan P. Vandenbroucke
- Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital, Aarhus, Denmark
- Leiden University Medical Center, Leiden, the Netherlands
- London School of Hygiene and Tropical Medicine, University of London, London, United Kingdom
| | - Hans Erik Bøtker
- Department of Cardiology, Aarhus University Hospital, Aarhus, Denmark
- Faculty of Health, Aarhus University, Aarhus, Denmark
| | - Henrik Toft Sørensen
- Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital, Aarhus, Denmark
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Laugesen K, Mengel-From J, Christensen K, Olsen J, Hougaard DM, Boding L, Olsen A, Erikstrup C, Hetland ML, Høgdall E, Kjaergaard AD, Sørensen E, Brügmann A, Petersen ERB, Brandslund I, Nordestgaard BG, Jensen GB, Skajaa N, Troelsen FS, Fuglsang CH, Svingel LS, Sørensen HT. A Review of Major Danish Biobanks: Advantages and Possibilities of Health Research in Denmark. Clin Epidemiol 2023; 15:213-239. [PMID: 36852012 PMCID: PMC9960719 DOI: 10.2147/clep.s392416] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 01/20/2023] [Indexed: 02/23/2023] Open
Abstract
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. The country is a rich source of biobanks and the universal, tax-funded healthcare system delivers routinely collected data to numerous registries and databases. By virtue of the civil registration number (assigned uniquely to all Danish citizens), biological specimens stored in biobanks can be combined with clinical and demographic data from these population-based health registries and databases. In this review, we aim to provide an understanding of advantages and possibilities of biobank research in Denmark. As knowledge about the Danish setting is needed to grasp the full potential, we first introduce the Danish healthcare system, the Civil Registration System, the population-based registries, and the interface with biobanks. We then describe the biobank infrastructures, comprising the Danish National Biobank Initiative, the Bio- and Genome Bank Denmark, and the Danish National Genome Center. Further, we briefly provide an overview of fourteen selected biobanks, including: The Danish Newborn Screening Biobank; The Danish National Birth Cohort; The Danish Twin Registry Biobank; Diet, Cancer and Health; Diet, Cancer and Health - Next generations; Danish Centre for Strategic Research in Type 2 Diabetes; Vejle Diabetes Biobank; The Copenhagen Hospital Biobank; The Copenhagen City Heart Study; The Copenhagen General Population Study; The Danish Cancer Biobank; The Danish Rheumatological Biobank; The Danish Blood Donor Study; and The Danish Pathology Databank. Last, we inform on practical aspects, such as data access, and discuss future implications.
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Affiliation(s)
- Kristina Laugesen
- Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Aarhus, Denmark
| | - Jonas Mengel-From
- Epidemiology, Biostatistics and Biodemography, the Danish Twin Registry, and the Danish Aging Research Center, Department of Public Health, University of Southern Denmark, Odense, Denmark.,Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
| | - Kaare Christensen
- Epidemiology, Biostatistics and Biodemography, the Danish Twin Registry, and the Danish Aging Research Center, Department of Public Health, University of Southern Denmark, Odense, Denmark.,Department of Clinical Genetics, Odense University Hospital, Odense, Denmark.,Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark
| | - Jørn Olsen
- Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Aarhus, Denmark
| | - David M Hougaard
- iPSYCH, Lundbeck Foundation Initiative for Integrative Psychiatric Research, Aarhus, Denmark.,Center for Neonatal Screening, Department for Congenital Disorders, Statens Serum Institut, Copenhagen, Denmark
| | - Lasse Boding
- The Danish National Biobank, Statens Serum Institut, Copenhagen, Denmark
| | - Anja Olsen
- Danish Cancer Society Research Center, Danish Cancer Society, Copenhagen, Denmark.,Department of Public Health, Aarhus University, Aarhus, Denmark
| | - Christian Erikstrup
- Department of Clinical Immunology, Aarhus University Hospital and Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Merete Lund Hetland
- The DANBIO Registry and Copenhagen Center for Arthritis Research (COPECARE), Center for Rheumatology and Spine Diseases, Centre of Head and Orthopaedics, Copenhagen University Hospital Rigshospitalet, Glostrup, Denmark.,Department of Clinical Medicine, University of Copenhagen, Faculty of Health and Medical Sciences, Copenhagen, Denmark
| | - Estrid Høgdall
- Department of Clinical Medicine, University of Copenhagen, Faculty of Health and Medical Sciences, Copenhagen, Denmark.,Bio- and GenomeBank Denmark (RBGB), Molecular Unit, Department of Pathology, Herlev Hospital, Herlev, Denmark
| | - Alisa D Kjaergaard
- Steno Diabetes Center Aarhus, Aarhus University Hospital, Aarhus, Denmark
| | - Erik Sørensen
- Department of Clinical Immunology, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark
| | - Anja Brügmann
- Department of Pathology, Aalborg University Hospital, Aalborg, Denmark
| | | | - Ivan Brandslund
- Department of Clinical Biochemistry and Immunology, Lillebaelt Hospital, Vejle, Denmark.,Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark
| | - Børge G Nordestgaard
- The Copenhagen General Population Study, Department of Clinical Biochemistry, Copenhagen University Hospital - Herlev Gentofte, University of Copenhagen, Herlev, Denmark
| | - Gorm B Jensen
- The Copenhagen City Heart Study, Frederiksberg and Bispebjerg Hospital, Frederiksberg, Denmark
| | - Nils Skajaa
- Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Aarhus, Denmark
| | | | | | - Lise Skovgaard Svingel
- Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Aarhus, Denmark
| | - Henrik T Sørensen
- Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Aarhus, Denmark
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Fuglsang CH, Bakos I, Laugesen K, Troelsen FS, Horváth-Puhó E, Sørensen HT. Maternal Smoking During Pregnancy and Risk of Appendicitis in the Offspring. Epidemiology 2023; 34:293-301. [PMID: 36722812 PMCID: PMC9891296 DOI: 10.1097/ede.0000000000001566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 11/11/2022] [Indexed: 02/02/2023]
Abstract
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. We followed the children from birth until date of appendicitis, emigration, death, or administrative end of study (31 December 2018), whichever came first. We calculated crude and adjusted hazard ratios (HRs) of appendicitis with 95% confidence intervals (CIs) comparing children of mothers who smoked during pregnancy to children of nonsmokers. Further, we conducted a bias analysis and sibling analysis. RESULTS We included 1,659,526 singletons of whom 19% were born to mothers who smoked during pregnancy. After maximum 28 years of follow-up, hazard rates for children of smokers were slightly higher than for children of nonsmokers [adjusted HR: 1.07 (95% CI = 1.04, 1.10)]. Stratification by sex revealed no association for males [adjusted HR: 1.02 (95% CI = 0.99, 1.06)], but a higher HR for females [adjusted HR: 1.13 (95% CI = 1.09, 1.18)]. This association increased with increasing length of follow-up, indicating that the association may be mediated by later-life exposures. The bias analysis indicated that misclassification of maternal smoking could attenuate a true association, while the sibling analysis showed no association. CONCLUSIONS Maternal smoking during pregnancy and appendicitis in the offspring may be associated.
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Affiliation(s)
- Cecilia Hvitfeldt Fuglsang
- From the Department of Clinical Medicine, Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, Aarhus, Denmark
| | - Istvan Bakos
- From the Department of Clinical Medicine, Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, Aarhus, Denmark
| | - Kristina Laugesen
- From the Department of Clinical Medicine, Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, Aarhus, Denmark
| | - Frederikke Schønfeldt Troelsen
- From the Department of Clinical Medicine, Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, Aarhus, Denmark
| | - Erzsébet Horváth-Puhó
- From the Department of Clinical Medicine, Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, Aarhus, Denmark
| | - Henrik Toft Sørensen
- From the Department of Clinical Medicine, Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, Aarhus, Denmark
- Division of Gastroenterology and Hepatology, Department of Medicine, University of North Carolina, Chapel Hill, NC
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Okholm SH, Nagy D, Körmendiné Farkas D, Fuglsang CH, Troelsen FS, Henderson VW, Sørensen HT. Non-Traumatic Subdural Hematoma and Cancer: A Cohort Study. Clin Epidemiol 2023; 15:629-633. [PMID: 37187767 PMCID: PMC10178369 DOI: 10.2147/clep.s408667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 05/03/2023] [Indexed: 05/17/2023] Open
Abstract
Introduction Cancer may increase the risk of bleeding. However, whether subdural hematoma is a marker of occult cancer remains unknown. We examined the association between non-traumatic subdural hematoma and cancer risk in a cohort study. Materials and Methods Using Danish nationwide health registries, we identified 2713 patients with non-traumatic subdural hematoma and no previous cancer diagnosis, who were hospitalized between April 1, 1996 and December 31, 2019. We computed age-, sex-, and calendar year-standardized incidence ratios (SIRs) as the ratio of the observed to expected number of patients with cancer by using national incidence rates as reference as a measure of relative risk. Results We identified 77 cancer cases within the first year of follow-up and 272 cancer cases thereafter. The one-year risk of cancer was 2.8% (95% confidence interval: 2.2-3.5), and the one-year SIR was 1.7 (95% confidence interval: 1.3-2.1). During the subsequent years, the SIR was 1.0 (95% confidence interval: 0.9-1.1). The relative risk was elevated for some hematological and liver cancers. Conclusion The risk of a new cancer diagnosis was clearly increased in patients with non-traumatic subdural hematoma compared with the general population during the first year of follow-up. However, the absolute risk was low, thus limiting the clinical relevance of pursuing early cancer detection in these patients.
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Affiliation(s)
- Søren Hauge Okholm
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Dávid Nagy
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Dóra Körmendiné Farkas
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Cecilia Hvitfeldt Fuglsang
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | | | - Victor W Henderson
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Departments of Epidemiology & Population Health and of Neurology & Neurological Sciences, Stanford University, Stanford, CA, USA
| | - Henrik Toft Sørensen
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Correspondence: Henrik Toft Sørensen, Department of Clinical Epidemiology, Aarhus University Hospital and Aarhus University, Olof Palmes Allé 43-45, Aarhus N, 8200, Denmark, Tel +45 87 16 82 15, Email
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10
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Bonnesen K, Fuglsang CH, Korsgaard S, Lund KH, Gaster N, Ehrenstein V, Schmidt M. Use of Routinely Collected Registry Data for Undergraduate and Postgraduate Medical Education in Denmark. J Eur CME 2021; 10:1990661. [PMID: 34868732 PMCID: PMC8635585 DOI: 10.1080/21614083.2021.1990661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Kasper Bonnesen
- Department of Clinical Epidemiology, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | | | - Søren Korsgaard
- Department of Clinical Epidemiology, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - Katrine Hjuler Lund
- Department of Clinical Epidemiology, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - Natascha Gaster
- Department of Clinical Epidemiology, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - Vera Ehrenstein
- Department of Clinical Epidemiology, Aarhus University, Aarhus University Hospital, Aarhus, Denmark
| | - Morten Schmidt
- Department of Clinical Epidemiology, Aarhus University, Aarhus University Hospital, Aarhus, Denmark.,Department of Cardiology, Aarhus University Hospital, Aarhus, Denmark
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