Does faster cognitive decline predict death?
Among 11,732 Chinese older adults, rapid MMSE decline (>1.62 points/year) tracked a 75% higher subsequent 3-year death risk after adjusting for baseline cognition.
Source
Cognitive decline and mortality among community-dwelling Chinese older people
Study at a glance
- Design
- Cohort — Two successive CLHLS cohorts; Cox models of MMSE decline vs 3-year mortality
- N
- N=11732 · Older adults with two consecutive MMSE exams; mean age 82.5 years
- Population
- Community-dwelling Chinese older adults in CLHLS
- Outcome
- All-cause mortality after cognitive-decline assessment interval
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Does faster cognitive decline predict death?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
11,732 adults with two consecutive cognitive exams were followed for 3 years.
A total of 11,732 older adults who completed two consecutive cognitive function examinations were included and followed for 3 years.
Mean age 82.5 years; 44.9% were men.
The mean age was 82.5 years old, and 44.9% (5264/11732) of participants were men.
What they did
Nested two non-overlapping CLHLS cohorts, measured Chinese MMSE twice, then used Cox models relating rate of MMSE change to the next 3 years of mortality while adjusting for sociodemographics, behaviours, comorbidities, and baseline MMSE.
What they found
Mean age 82.5 years; 44.9% men. Faster MMSE decline monotonically associated with higher mortality. Rapid decliners had HR 1.75 (95% CI 1.57–1.95) vs stable cognition. Associations were stronger at ages 65–79 and with baseline MMSE ≥24, and were consistent across cohorts and sexes.
The limits
What it doesn't show
Observational CLHLS data cannot prove that slowing cognitive decline would prevent deaths; residual confounding and practice/measurement effects on MMSE remain possible.
Key terms
- MMSE
- Mini-Mental State Examination cognitive screen used here in Chinese.
- Cognitive decline
- Rate of decrease in MMSE score over roughly 3 years.
- CLHLS
- Chinese Longitudinal Healthy Longevity Survey community cohort.
- Hazard ratio
- Relative mortality rate comparing decline groups after covariates.
- Baseline cognition
- Initial MMSE used so decline effects are not just low starting scores.
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How many participants had two consecutive MMSE exams?
Common questions
Sample size?
11,732 older adults with two MMSE exams.
What counted as rapid decline?
MMSE reduction >1.62 points/year (faster than average).
Mortality association?
HR 1.75 (95% CI 1.57–1.95) vs stable cognition.
Who showed stronger links?
Ages 65–79 and those with baseline MMSE ≥24.
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