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Trajectories of cognitive function and their determinants in older people: 12 years of follow-up in the Chinese Longitudinal Healthy Longevity Survey

Cognitive decline in advanced age is closely related to dementia. The trajectory of cognitive function in older Chinese is yet to be fully investigated. We aimed to investigate the trajectories of cognitive function in a nationally representative sample of older people living in China and to explore...

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Published in:International psychogeriatrics 2020-06, Vol.32 (6), p.765-775
Main Authors: Tu, Lihui, Lv, Xiaozhen, Yuan, Changzheng, Zhang, Ming, Fan, Zili, Xu, Xiaolin, Zeng, Yi, Yu, Xin, Wang, Huali
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description Cognitive decline in advanced age is closely related to dementia. The trajectory of cognitive function in older Chinese is yet to be fully investigated. We aimed to investigate the trajectories of cognitive function in a nationally representative sample of older people living in China and to explore the potential determinants of these trajectories. This study included 2,038 cognitively healthy persons aged 65–104 years at their first observation in the Chinese Longitudinal Healthy Longevity Survey from 2002 to 2014. Cognitive function was measured using the Chinese version of the Mini-Mental State Examination (MMSE). Group-based trajectory modeling was used to identify potential heterogeneity of longitudinal changes over the 12 years and to investigate associations between baseline predictors of group membership and these trajectories. Three trajectories were identified according to the following types of changes in MMSE scores: slow decline (14.0%), rapid decline (4.5%), and stable function (81.5%). Older age, female gender, having no schooling, a low frequency of leisure activity, and a low baseline MMSE score were associated with the slow decline trajectory. Older age, body mass index (BMI) less than 18.5 kg/m2, and having more than one cardiovascular disease (CVD) were associated with the rapid decline trajectory. Three trajectories of cognitive function were identified in the older Chinese population. The identified determinants of these trajectories could be targeted for developing prevention and intervention strategies for dementia.
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source Applied Social Sciences Index & Abstracts (ASSIA); Cambridge University Press journals; Social Science Premium Collection; Sociology Collection
subjects Activities of daily living
Body mass index
Chinese Longitudinal Healthy Longevity Survey
Chronic illnesses
cognitive function
group-based trajectory model
longitudinal
Mini-Mental State Examination
Older people
Original Research Article
risk factors
title Trajectories of cognitive function and their determinants in older people: 12 years of follow-up in the Chinese Longitudinal Healthy Longevity Survey
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