Association Between Urbanicity and Dementia in China: A Population-Based Study

Area of Science:

• Gerontology
• Public Health
• Epidemiology

Background:

• Urbanicity is a growing global phenomenon with potential impacts on cognitive health.
• Understanding the relationship between urban environments and dementia is crucial for public health strategies.

Purpose of the Study:

• To investigate the association between urbanicity and dementia in Chinese adults aged 50 and older.
• To explore the nonlinear pattern of this relationship.

Main Methods:

• Utilized data from China's Second National Sample Survey on Disability (2006).
• Dementia diagnosis involved a two-stage process: reported information and specialist medical assessment.
• Employed logistic regression and restricted polynomial spline regression models.

Main Results:

• A 10% increase in urbanization correlated with a 73% decrease in dementia odds, after adjusting for covariates.
• This association was more pronounced in younger adults and specifically in women.
• Spline regression revealed a nonlinear relationship, with very high urbanization levels associated with increased dementia odds.

Conclusions:

• The relationship between urbanicity and dementia is nuanced and warrants careful examination, particularly for younger women.
• Very high levels of urbanization may pose a risk for dementia, contrary to the general trend observed at lower levels.