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Molecular Neurobiology

, Volume 53, Issue 5, pp 3113–3123 | Cite as

Education and Risk of Dementia: Dose-Response Meta-Analysis of Prospective Cohort Studies

  • Wei Xu
  • Lan TanEmail author
  • Hui-Fu Wang
  • Meng-Shan Tan
  • Lin Tan
  • Jie-Qiong Li
  • Qing-Fei Zhao
  • Jin-Tai YuEmail author
Article

Abstract

Educational level has been regarded as one of the most widely accepted risk factors in the epidemiological studies for dementia, despite with discordant qualitative results. However, the dose-response relation between education and incident dementia was still unknown. To quantitatively evaluate the association between exposure level to high and low education and risk of dementia, we searched PubMed, EMBASE, and the Cochrane Library up to November 2014 and references of retrieved literatures. Specific prospective cohort studies, in which educational attainment was categorized into at least three levels, were included. Newcastle-Ottawa scale was used to assess the quality of included studies. Fifteen prospective cohort studies with 55655 for low education and eight prospective cohort studies with 20172 for high education were included. In the qualitative analysis, both low and high education showed a dose-response trend with risk of dementia and Alzheimer’s disease (AD). In the quantitative analysis, the dementia risk was reduced by 7 % for per year increase in education (RR, 0.93; 95 % CI, 0.92–0.94; p for overall trend = 0.000; p for nonlinearity = 0.0643). Nonetheless, we did not find statistically significant association between per year decrease in education and dementia (RR, 1.03; 95 % CI, 0.96–1.10; p for overall trend = 0.283; p for nonlinearity = 0.0041) or AD (RR, 1.03; 95 % CI, 0.97–1.10; p for overall trend = 0.357; p for nonlinearity = 0.0022). Both low and high education showed a trend of dose-response relation with risk of dementia and AD. The dementia risk was reduced by 7 % for per year increase in education.

Keywords

Education Dementia Meta-analysis Risk factor 

Notes

Acknowledgments

This work was supported by grants from the National Natural Science Foundation of China (81471309, 81171209), the Shandong Provincial Outstanding Medical Academic Professional Program, Qingdao Key Health Discipline Development Fund, and Qingdao Outstanding Health Professional Development Fund.

Conflicts of Interest

The authors declare no conflicts of interest.

Supplementary material

12035_2015_9211_MOESM1_ESM.pdf (995 kb)
ESM 1 (PDF 995 kb)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Wei Xu
    • 1
  • Lan Tan
    • 1
    • 2
    Email author
  • Hui-Fu Wang
    • 2
  • Meng-Shan Tan
    • 1
  • Lin Tan
    • 3
  • Jie-Qiong Li
    • 1
  • Qing-Fei Zhao
    • 1
  • Jin-Tai Yu
    • 1
    • 4
    Email author
  1. 1.Department of Neurology, Qingdao Municipal Hospital, School of MedicineQingdao UniversityQingdaoChina
  2. 2.Department of Neurology, Qingdao Municipal HospitalNanjing Medical University, NanjingQingdaoChina
  3. 3.Department of Neurology, Qingdao Municipal Hospital, College of Medicine and PharmaceuticsOcean University of ChinaQingdaoChina
  4. 4.Memory and Aging Center, Department of NeurologyUniversity of CaliforniaSan FranciscoUSA

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