Cognitive impairment and all-cause mortality among Chinese adults aged 80 years or older.

Journal Article (Journal Article)

Objectives

The oldest-old (aged ≥80 years) are the fastest growing population segment and age is related to cognitive impairment. We aimed to estimate the association between cognitive impairment and all-cause mortality, in addition to the relationship with different cognitive subdomains among the oldest-old in China.

Methods

We analyzed 25,285 participants recruited from 22 out of 30 provinces in the Chinese Longitudinal Healthy Longevity Survey (CLHLS) from 1998 to 2008, with mortality follow-up until 2014. Cognitive function was measured by the Chinese-version 30-item Mini-Mental State Examination (MMSE), classified as no (MMSE score: 25-30), mild (18-24), moderate (10-17), and severe (0-9) impairment. We used time-dependent Cox model to evaluate the relationship between time-varying cognition and mortality.

Results

The relationship between cognition and mortality showed a dose-response pattern among the overall population. Compared to those with no impairment, participants with moderate (HR = 1.41, 95% CI 1.28-1.56) and severe (HR = 1.77, 95% CI 1.59-1.96) cognitive impairment showed increased mortality risk. Impairment in the subdomain of orientation was independently associated with increased mortality risk (HR = 1.20, 95% CI 1.05-1.36) among participants without overall cognitive impairment. Urban and rural residents had similar mortality risk.

Conclusions

A consistent dose-response pattern existed between cognitive impairment and all-cause mortality. Orientation was associated with mortality in the population without cognitive impairment. Similar mortality regardless of residence areas indicated scarce health care and treatment for cognitive impairment in China from 1998 to 2014.

Full Text

Duke Authors

Cited Authors

  • Li, Y; Jiang, H; Jin, X; Wang, H; Ji, JS; Yan, LL

Published Date

  • October 2021

Published In

Volume / Issue

  • 11 / 10

Start / End Page

  • e2325 -

PubMed ID

  • 34492738

Pubmed Central ID

  • PMC8553308

Electronic International Standard Serial Number (EISSN)

  • 2162-3279

International Standard Serial Number (ISSN)

  • 2162-3279

Digital Object Identifier (DOI)

  • 10.1002/brb3.2325

Language

  • eng