Canadian Study of Health and Aging

The Prevalence of Dementia

1991 Baseline Study1991 Baseline Study

Canadian Study of Health and Aging

1000 kms.

CSHA Study Centres

Canadian Study of Health and Aging

Prevalence of DementiaCanada 1991-92

0

50

100

150

200

250

300

350

400

65-74 75-84 85 +

WomenMenTotal

Rate per 1,000

Source: Can Med Assoc J 1994;150:899-913

Canadian Study of Health and Aging

Estimated Numbers of Canadians, 65+, with Dementia, 1991

010,00020,00030,00040,00050,00060,00070,00080,00090,000

100,000

Community Institution

MaleFemale

Source: Can Med Assoc J 1994;150:899-913

Canadian Study of Health and Aging

Prevalence of Cognitive Disorderby severity and gender (Canada, 1991) Cognitively Cognitively impaired; Dementia normal not dementia Mild Mod. Severe

Male % 72.6 21.3 2.1 2.6 1.4

Female % 77.1 13.5 2.4 3.6 3.5

M + F % 75.2 16.8 2.3 3.1 2.6

Source: Lancet 1997;349:1793

Canadian Study of Health and Aging

More on the Prevalence of Dementia• Prevalence continues to rise beyond age 85; by 105 years of Prevalence continues to rise beyond age 85; by 105 years of

age almost 85% of people have dementiaage almost 85% of people have dementia (Ebly et al., 1994) (Ebly et al., 1994)

• Hogan et al. (1996) described physiologic changes as Hogan et al. (1996) described physiologic changes as dementia progresses; these are similar for AD and vascular dementia progresses; these are similar for AD and vascular dementia.dementia.

• About half of those with dementia live in the community About half of those with dementia live in the community and half in institutions and half in institutions (CSHA, 1994)(CSHA, 1994)

• For almost two-thirds of those with dementia in the For almost two-thirds of those with dementia in the community, their dementia has not been formally diagnosed community, their dementia has not been formally diagnosed (Sternberg et al., 2000)(Sternberg et al., 2000)

Canadian Study of Health and Aging

Background:Projected Prevalence of Dementia (x 1,000)

Canada, 1991 - 2031

0

100

200

300

400

500

600

700

800

1991 2001 2011 2021 2031

All Dementias

AD

Vascularx 2

x 3

Source: CMAJ 1994; 150: 899-913

Canadian Study of Health and Aging

The Impact of Demographic Changes on Annual Incidence of Dementia in Canada

0

50,000

100,000

150,000

65-69 70-74 75-79 80-84 85+ Allages

Numbers of cases

20112001

1991

Note: this chart assumes constant age-sex prevalencerates for dementia, and shows the impact of the growth in the elderly population on numbers of people with dementia