Background Among the symptoms commonly faced by an increasingly aged population, dementia, preceded by cognitive impairment, most threatens their quality of life. Dementia is a well‐recognized burden, not only for individuals who face the disease and for their families, but also for entire nation. Aims The purpose of this study was to identify associated factors for cognitive impairment in a very elderly population via a screening study design in Sokcho, a rural area in South Korea. Methods Trained nurses screened patients from 75–84 years of age for dementia using the Mini‐Mental State Examination for Dementia Screening (MMSE‐DS) and conducted interviews to determine their socioeconomic status, education level, and living conditions (i.e., with or without family). Results In total, 4,369 subjects (1,646 males, 2,723 females) were enrolled in this study. Reported MMSE‐DS scores decreased with increasing age and to a greater degree in less educated subjects ( p < 0.001). Subjects requiring medical assistance or living alone exhibited lower MMSE‐DS scores compared to those who did not require medical assistance or who lived alone ( p < 0.001). Conclusion We found that less education, lower socioeconomic status, and living alone were associated factors for cognitive impairment based on this study of an elderly population.
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