Table 1.

Sample size calculation (total and by age group) according the prevalence of dementia.

	65–69 years	70–74 years	75–79 years	80–84 years	85+ years	Total
Population	180,352	150,687	136,275	97,113	72,399	636,826
Prevalence of dementia	0.026	0.043	0.074	0.129	0.324	–
Estimated population with dementia	4,689	6,480	10,084	12,528	23,457	57,238
Final sample (1%)	47	65	101	125	235	572