Skip to main content

Table 2 Prevalence of dementia according to major studies specifically examining the oldest old

From: Dementia in the oldest old: a multi-factorial and growing public health issue

Study Age (years) n Population Level of education Baseline dementia prevalence
90+ Study [6] 90+ 911 Survivors of Leisure World Cohort Study (77% female) High (51% vocational school or college degree) 41% (45% of females; 28% of males)
Leiden 85-Plus Study [20] 85+ 891 Inhabitants of Leiden, Sweden (72% female) Not reported 23% (24% of females; 18% of males; 34% of 90+)
Vantaa 85+ Study [21] 85+ 521 Inhabitants of Vantaa, Finland (79% female) Low (mean 4.2 years) 38% (39% of females; 35% of males; 90+ data not available)
WISE [22] 85+ 1,299 Ancillary study to Study of Osteoporotic Fractures (100% female) High (85% high school or greater) 18% (28% of 90+)
Kungsholmen Project [23, 24] 85+ 987 Inhabitants of the Kungsholmen district, Stockholm, Sweden (68% female) Low (63% of 90+ participants only elementary school) 32% (36% of females; 22% of males; 39% of 90+)
Cache County Study [27] 85+ 719 Inhabitants of Cache County, Utah (66% female) Medium (mean 12.1 years) 23% (24% of females; 20% of males; 38% of 90+)
Eurodem [25] 85+ 1,623 Combined data from dementia prevalence studies conducted in 10 different European countries, including the Leiden 85-Plus Study (73% female) Variable 24% (26% of females; 22% of males; 33% of 90+)
Canadian Study of Health and Aging [26] 85+ 1,807 Inhabitants of Canada (72% female) Medium (mean 9 years) 29% (31% of females; 23% of males; 44% of 90+)
  1. Major publications from which prevalence data were derived are cited for each study. WISE, Women Cognitive Impairment Study of Exceptional Aging.