. Author manuscript; available in PMC: 2019 Jan 11.

Published in final edited form as: J Alzheimers Dis. 2018;66(1):347–357. doi: 10.3233/JAD-180604

Table 3.

Incidence of dementia across the five classes (% in parentheses).

	N (%)	Person-years	Dementia cases (%)	Incidence-rate per 100 person-years	AD cases (%)	Incidence-rate per 100 person-years
Mixed-Domain Impairment	107 (8)	370.8	32 (21.5)	8.6	26 (21.1)	7.0
Memory-Specific Impairment	457 (34)	1933.0	72 (48.3)	3.7	61 (49.6)	3.2
Frontal Impairment	118 (8.8)	2683.8	29 (19.5)	1.1	10 (8.1)	0.4
Average	539 (40.1)	350.9	13 (8.7)	3.7	24 (19.5)	6.8
Superior Cognition	124 (9.2)	589.6	3 (2.0)	0.5	2 (1.6)	0.3

Total	1,345 (100)	5928.1	149 (100)	2.5	123 (100)	2.2

Note. Percentages are column percentages. AD = Alzheimer’s disease.