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A meta-analysis of cohort studies: Traumatic brain injury and risk of Alzheimer’s Disease

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  • Jieyu Zhang
  • Yongkang Zhang
  • Juntao Zou
  • Fei Cao

Abstract

Introduction: Recently, some epidemiological studies have reported that cognitive disorders in elderly people is accelerated with traumatic brain injury. But the causal relationship between traumatic brain injury and AD is still an area of controversy. Aims: Our review was conducted to estimate the relation between traumatic brain injury and risk of AD. Methods: All longitudinal population-based studies comparing incidence of AD between subjects with and without traumatic brain injury from their inception to September 2020 were searched in The Cochrane Library, PubMed, Medline, Embase, Web of Science without restriction of language. The meta-analysis was conducted using Stata software. Results: A total of 17 studies involving 4289,548 individuals were included. After pooling these 17 studies, subjects with traumatic brain injury had significant higher incidence of AD than those without traumatic brain injury (RR: 1.17, 95% CI: 1.05–1.29). When considering the severity of traumatic brain injury, this elevated risk of AD was still significant comparing subjects with moderate and severe traumatic brain injury and those with no traumatic brain injury (RR: 1.30, 95% CI: 1.01–1.59). Conclusion: Traumatic brain injury, especially moderate and severe traumatic brain injury may be associated with increased risk of AD.

Suggested Citation

  • Jieyu Zhang & Yongkang Zhang & Juntao Zou & Fei Cao, 2021. "A meta-analysis of cohort studies: Traumatic brain injury and risk of Alzheimer’s Disease," PLOS ONE, Public Library of Science, vol. 16(6), pages 1-8, June.
    • Handle: RePEc:plo:pone00:0253206
    DOI: 10.1371/journal.pone.0253206
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    References listed on IDEAS

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    1. Yanjun Li & Yongming Li & Xiaotao Li & Shuang Zhang & Jincheng Zhao & Xiaofeng Zhu & Guozhong Tian, 2017. "Head Injury as a Risk Factor for Dementia and Alzheimer’s Disease: A Systematic Review and Meta-Analysis of 32 Observational Studies," PLOS ONE, Public Library of Science, vol. 12(1), pages 1-17, January.
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