Cognitive impairment in nondemented oldest-old: Prevalence and relationship to cardiovascular risk factors
Alzheimer's & Dementia, 03/16/2012
Peltz CB et al. – The study found a high prevalence of cognitive impairment in a sample of nondemented oldest–old. The authors did not find a strong relationship between cardiovascular risk factors and the cognitive impairment groups, other than between hypertension and naMCI and stroke and OCI. Future studies comparing the incidence of dementia in these groups will ultimately determine their predictive utility in the oldest–old.Methods
- The participants were 420 nondemented individuals from The 90+ Study, a study of aging and dementia in the oldest-old.
- These participants were categorized into four nonoverlapping groups: normal cognition, amnestic mild cognitive impairment (aMCI), nonamnestic MCI (naMCI), and other cognitive impairment (OCI). History of cardiovascular risk factors was assessed through self-report.
- The overall prevalence of cognitive impairment in nondemented participants was 34.0% (95% CI: 29.5–38.5).
- The prevalence of OCI was highest (17.4%; 95% CI: 13.9–21.4), followed by aMCI (8.3%; 95% CI: 5.9–11.4) and naMCI (8.3%; 95% CI: 5.9–11.4).
- Normal cognition was present in 66.0% (95% CI: 61.2–70.5) of participants.
- History of hypertension and stroke were the only risk factors that varied between the groups, occurring more frequently in participants with naMCI (Χ2 = 3.82; P < .05) and OCI (Χ2 = 5.51; P < .05).