Abstract
INTRODUCTION: China has the world's largest number of older adults with cognitive impairment (CI). We aimed to examine secular trends in the prevalence of CI in China from 2002 to 2018.
METHODS: Generalized estimating equations (GEE) was used to assess changes in CI trend in 44,154 individuals (72,027 observations) aged 65 to 105 years old.
RESULTS: The prevalence of CI increased from 2002 to 2008 and then decreased until 2018. The age-standardized prevalence increased from 25.7% in 2002, 26.1% in 2005, to 28.2% in 2008, then decreased to 26.0% in 2011, 25.3% in 2014, and 24.9% in 2018. Females and those ≥ 80 years old had greater CI prevalence.
DISCUSSION: The prevalence of CI showed an inverted U shape from early 2000s to late 2010s with a peak in 2008. Follow-up studies are needed to confirm the decreasing trend after 2008 and examine the contributing factors and underlying mechanisms of this trend.
HIGHLIGHTS: Generalized estimating equations (GEE) were used to assess trends of changes in cognitive impairment (CI). CI prevalence in China increased from 2002 to 2008 and then decreased until 2018. Females and those ≥ 80 years old had greater CI prevalence. Stroke, diabetes, and cigarette smoking were risk factors for CI.
| Original language | English |
|---|---|
| Pages (from-to) | 1387-1396 |
| Number of pages | 10 |
| Journal | Alzheimer's & dementia : the journal of the Alzheimer's Association |
| Volume | 20 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2024 |
Bibliographical note
© 2023 The Authors. Alzheimer's & Dementia published by Wiley Periodicals LLC on behalf of Alzheimer's Association.Funding
The data analyzed in this paper were from the Chinese Longitudinal Healthy Longevity Study (CLHLS) which was supported by multiple funding agencies in China, Singapore, U.S.A., and Sweden. We thank all participants of the CLHLS cohort. LF proposed the analysis; LF and QF designed the study and drafted the paper. HC performed the statistical data analysis and worked with LF and QF to draft the paper. All authors discussed and contributed to the theoretical framework, interpretation of the results, and revised and gave final approval of this manuscript.