Association between urbanicity and dementia in China: a population-based study

Luo Y, Zhao Y, Pang L, Guo C, Liang R, & Zheng X (2020). Association between urbanicity and dementia in China: a population-based study. The Journals of Gerontology: Series B DOI:10.1093/geronb/gbaa090. (In Press)

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Abstract

Objectives
This study investigated the relationship between urbanicity and dementia, and predicted its non-linear pattern among Chinese adults aged 50 years old and above.

Methods
This study used data from the Second National Sample Survey on Disability, which was implemented from 1 April to 31 May 2006 across China. Dementia status was determined by a two-stage process: the combination of self-reports or family members’ reports and an on-site medical diagnosis by experienced specialists based on the International Statistical Classification of Diseases and Related Health Problems 10th Revision Symptom Checklist for Mental Disorders. Logistic regression models were used to examine the relationship between urbanicity and dementia, and restricted polynomial spline regression models were plotted to examine the non-linear exposure-response relationship of urbanicity and dementia.

Results
Logistic regression results showed that an increase of 10% in the degree of urbanization was associated with a 73% decrease in the odds of dementia after adjusting for covariates, particularly area-level socioeconomic variables. This observed association was stronger in the younger age group, and this age group difference was only present in females. Spline regression findings suggested a non-linear exposure-response relationship between urbanicity and the odds of dementia. Areas with very high levels of urbanization were associated with increased odds of dementia.

Conclusions
These findings highlight the necessity to properly examine the nuanced relationship between urbanicity and mental health, especially for females in the younger age group. Notably, there were increased odds of dementia at very high levels of urbanicity.

Item Type: Article
Uncontrolled Keywords: dementia, urbanicity, non-linear relationship
Research Programs: Advanced Systems Analysis (ASA)
Depositing User: Luke Kirwan
Date Deposited: 10 Jul 2020 11:43
Last Modified: 13 Jul 2020 08:30
URI: http://pure.iiasa.ac.at/16564

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