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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.