Traumatic brain injury and the risk of dementia diagnosis: A nationwide cohort study

Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. The cohort considered for inclusion c...

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Published inNature methods Vol. 15; no. 1; p. e1002496
Main Authors Nordström, Anna, Nordström, Peter
Format Journal Article
LanguageEnglish
Published United States Public Library of Science 30.01.2018
Public Library of Science (PLoS)
Subjects
Online AccessGet full text
ISSN1549-1676
1549-1277
1548-7091
1548-7105
1549-1676
1548-7105
DOI10.1371/journal.pmed.1002496

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Abstract Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. The cohort considered for inclusion comprised all individuals in Sweden aged ≥50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found. The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
AbstractList Background Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. Methods and findings The cohort considered for inclusion comprised all individuals in Sweden aged 50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0–49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75–1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23–3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11–1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57–1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95–2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51–3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62– 2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found. Conclusions The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied.BACKGROUNDTraumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied.The cohort considered for inclusion comprised all individuals in Sweden aged ≥50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found.METHODS AND FINDINGSThe cohort considered for inclusion comprised all individuals in Sweden aged ≥50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found.The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.CONCLUSIONSThe risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
Using longitudinal, case-control, and sibling-matched analyses of nationwide data from Sweden, Peter Nordström and Anna Nordström describe the association between TBI and dementia, its time course, and the influence of familial factors.
Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. The cohort considered for inclusion comprised all individuals in Sweden aged [greater than or equal to]50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found. The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. The cohort considered for inclusion comprised all individuals in Sweden aged ≥50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found. The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
Background Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. Methods and findings The cohort considered for inclusion comprised all individuals in Sweden aged ≥50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found. Conclusions The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
Background Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. Methods and findings The cohort considered for inclusion comprised all individuals in Sweden aged ≥50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found. Conclusions The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
Background Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. Methods and findings The cohort considered for inclusion comprised all individuals in Sweden aged [greater than or equal to]50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found. Conclusions The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
BACKGROUND: Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is similar for different TBI types, and whether it is influenced by familial aggregation are not well studied. METHODS AND FINDINGS: The cohort considered for inclusion comprised all individuals in Sweden aged ≥50 years on December 31, 2005 (n = 3,329,360). Diagnoses of dementia and TBI were tracked through nationwide databases from 1964 until December 31, 2012. In a first cohort, individuals diagnosed with TBI (n = 164,334) were matched with up to two controls. A second cohort consisted of subjects diagnosed with dementia during follow-up (n = 136,233) matched with up to two controls. A third cohort consisted of 46,970 full sibling pairs with discordant TBI status. During a mean follow-up period of 15.3 (range, 0-49) years, 21,963 individuals in the first cohort (6.3% with TBI, 3.6% without TBI) were diagnosed with dementia (adjusted odds ratio [OR], 1.81; 95% confidence interval [CI], 1.75-1.86). The association was strongest in the first year after TBI (OR, 3.52; 95% CI, 3.23-3.84), but the risk remained significant >30 years (OR, 1.25; 95% CI, 1.11-1.41). Single mild TBI showed a weaker association with dementia (OR, 1.63; 95% CI, 1.57-1.70) than did more severe TBI (OR, 2.06; 95% CI, 1.95-2.19) and multiple TBIs (OR, 2.81; 95% CI, 2.51-3.15). These results were in general confirmed in the nested case-control cohort. TBI was also associated with an increased risk of dementia diagnosis in sibling pairs with discordant TBI status (OR, 1.89; 95% CI, 1.62-2.21). A main limitation of the present study is the observational design. Thus, no causal inferences can be made based on the associations found. CONCLUSIONS: The risk of dementia diagnosis decreased over time after TBI, but it was still evident >30 years after the trauma. The association was stronger for more severe TBI and multiple TBIs, and it persisted after adjustment for familial factors.
Audience Academic
Author Nordström, Anna
Nordström, Peter
AuthorAffiliation 3 Department of Community Medicine and Rehabilitation, Geriatric Medicine, Umeå University, Umeå, Sweden
2 School of Sports Science, UiT The Arctic University of Norway, Tromsø, Norway
University of Cambridge, UNITED KINGDOM
1 Department of Public Health and Clinical Medicine, Environmental Medicine, Umeå University, Umeå, Sweden
AuthorAffiliation_xml – name: 3 Department of Community Medicine and Rehabilitation, Geriatric Medicine, Umeå University, Umeå, Sweden
– name: University of Cambridge, UNITED KINGDOM
– name: 2 School of Sports Science, UiT The Arctic University of Norway, Tromsø, Norway
– name: 1 Department of Public Health and Clinical Medicine, Environmental Medicine, Umeå University, Umeå, Sweden
Author_xml – sequence: 1
  givenname: Anna
  orcidid: 0000-0003-3534-456X
  surname: Nordström
  fullname: Nordström, Anna
– sequence: 2
  givenname: Peter
  orcidid: 0000-0003-2924-508X
  surname: Nordström
  fullname: Nordström, Peter
BackLink https://www.ncbi.nlm.nih.gov/pubmed/29381704$$D View this record in MEDLINE/PubMed
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-144509$$DView record from Swedish Publication Index
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ContentType Journal Article
Copyright COPYRIGHT 2018 Public Library of Science
2018 Public Library of Science. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Nordström A, Nordström P (2018) Traumatic brain injury and the risk of dementia diagnosis: A nationwide cohort study. PLoS Med 15(1): e1002496. https://doi.org/10.1371/journal.pmed.1002496
info:eu-repo/semantics/openAccess
2018 Nordström, Nordström 2018 Nordström, Nordström
2018 Public Library of Science. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Nordström A, Nordström P (2018) Traumatic brain injury and the risk of dementia diagnosis: A nationwide cohort study. PLoS Med 15(1): e1002496. https://doi.org/10.1371/journal.pmed.1002496
Copyright_xml – notice: COPYRIGHT 2018 Public Library of Science
– notice: 2018 Public Library of Science. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Nordström A, Nordström P (2018) Traumatic brain injury and the risk of dementia diagnosis: A nationwide cohort study. PLoS Med 15(1): e1002496. https://doi.org/10.1371/journal.pmed.1002496
– notice: info:eu-repo/semantics/openAccess
– notice: 2018 Nordström, Nordström 2018 Nordström, Nordström
– notice: 2018 Public Library of Science. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Nordström A, Nordström P (2018) Traumatic brain injury and the risk of dementia diagnosis: A nationwide cohort study. PLoS Med 15(1): e1002496. https://doi.org/10.1371/journal.pmed.1002496
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– volume: 51
  start-page: 1213
  year: 2003
  ident: ref18
  article-title: Dementia as a risk factor for falls and fall injuries among nursing home residents
  publication-title: J Am Geriatr Soc
  doi: 10.1046/j.1532-5415.2003.51404.x
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Snippet Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether it is...
Background Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether...
Background Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether...
Using longitudinal, case-control, and sibling-matched analyses of nationwide data from Sweden, Peter Nordström and Anna Nordström describe the association...
BACKGROUND: Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI,...
BACKGROUND:Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether...
Background Traumatic brain injury (TBI) has been associated with dementia. The questions of whether the risk of dementia decreases over time after TBI, whether...
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SubjectTerms Aged
Aged, 80 and over
Biology and Life Sciences
Brain
Brain injuries
Brain Injuries, Traumatic - complications
Case-Control Studies
Cohort analysis
Cohort Studies
Dementia
Dementia - epidemiology
Dementia - etiology
Dementia disorders
Diagnosis
Female
Head injuries
Health risk assessment
Health risks
Humans
Incidence
Male
Medicine and Health Sciences
Middle Aged
Odds Ratio
People and places
Research and Analysis Methods
Retrospective Studies
Risk Factors
Studies
Sweden - epidemiology
Traumatic brain injury
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Title Traumatic brain injury and the risk of dementia diagnosis: A nationwide cohort study
URI https://www.ncbi.nlm.nih.gov/pubmed/29381704
https://www.proquest.com/docview/2002618299
https://www.proquest.com/docview/1993010342
http://hdl.handle.net/10037/25230
https://pubmed.ncbi.nlm.nih.gov/PMC5790223
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-144509
https://doaj.org/article/6ac183f56c1c4f9c904d5df237f2c539
http://dx.doi.org/10.1371/journal.pmed.1002496
Volume 15
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