Table 2: Summary of some studies that evaluate the prevalence of dementia in respective countries or regions.

Country/
region
StudyYearADVaDPrevalence of
dementia
Reference

EuropeCollaborative study19904.4% > 65 years1.6% > 65 years 6.4% > 65 years [14]

Ommoord Rotterdam Study199572% > 55 years 16% > 55 years 6.3% > 55 years [15]

ItalyILSA Study1992-19936.55% > 65 years 3.30% > 65 years 12.47% > 65 years [16]

USAADAMS200714% > 71 years [7]

Latin AmericaDelphi Consensus Study2005 7.3% > 75 years[4]

KoreaKLoSHA20064.8% > 65 years 1.0% > 65 years 6.3% > 65 years [17]

SingaporeSingaporean study1995Chinese: 2.5% and
Malays: 4.0% among the elderly
[18]

ChinaPeople’s Republic of China study1980–20101.9% > 60 years 0.9% > 60 years 3.0% > 60 years[1921]

Africa-USAIndianapolis-Ibadan Dementia Project2001Native Yoruba: 1.4%,
African American: 6.3%
Native Yoruba: 2.3%,
African American: 8.3%
[22]

AfricaSystematic analysis201257.1% > 50 years26.9% > 50 years2.4% > 50 years[23]

Middle EastWadi Ara study200220.5% among the elderly22.0% among the elderly[24]