|Resumen: ||This article describes the rationale and design of a population-based survey of dementia in Valladolid
(northwestern Spain). The main aim of the study was to assess the epidemiology of dementia and its subtypes.
Prevalence of anosognosia in dementia patients, nutritional status, diet characteristics, and determinants of
non-diagnosed dementia in the community were studied. The main sociodemographic, educational, and general
health status characteristics of the study population are described.
Methods: Cross-over and cohort, population-based study. A two-phase door-to-door study was performed. Both
urban and rural environments were included. In phase 1 (February 2009 – February 2010) 28 trained physicians
examined a population of 2,989 subjects (age: ≥ 65 years). The seven-minute screen neurocognitive battery was
used. In phase 2 (May 2009 – May 2010) 4 neurologists, 1 geriatrician, and 3 neuropsychologists confirmed the
diagnosis of dementia and subtype in patients screened positive by a structured neurological evaluation. Specific
instruments to assess anosognosia, the nutritional status and diet characteristics were used. Of the initial sample,
2,170 subjects were evaluated (57% female, mean age 76.5 ± 7.8, 5.2% institutionalized), whose characteristics are
described. 227 persons were excluded for various reasons. Among those eligible were 592 non-responders. The
attrition bias of non-responders was lower in rural areas. 241 screened positive (11.1%).
Discussion: The survey will explore some clinical, social and health related life-style variables of dementia. The
population size and the diversification of social and educational backgrounds will contribute to a better knowledge
of dementia in our environment.
Keywords: Dementia prevalence, Epidemiology, Undiagnosed dementia, Population-based survey, Seven-minute
screen, Anosognosia, Nutritional assessment|