Table 2.

Characteristics of 2,125 African Americans and European Americans With No cognitive Impairment, and Developing AD Dementia and MCI at the Time of Clinical Evaluation for Diagnosis of AD Dementia and MCI

	African Americans			European Americans
	No Cognitive Impairment	Developing AD Dementia	Developing MCI	No Cognitive Impairment	Developing AD Dementia	Developing MCI
Age at diagnosis, y	78.3 (5.7)	82.6 (5.7)	80.4 (5.9)	81.8 (6.1)	85.2 (6.1)	84.0 (6.3)
Time to diagnosis, y	8.8 (4.0)a	8.4 (3.9)	8.4 (4.0)	8.2 (3.9)a	7.3 (3.6)	7.3 (3.8)
Cognitive function	0.356 (0.411)	−0.597 (0.718)	0.007 (0.510)	0.593 (0.390)	−0.549 (0.739)	0.247 (0.520)

Note: Mean (SD) is presented for age at diagnosis, time to diagnosis, and cognitive function. AD = Alzheimer’s disease; MCI = mild cognitive impairment.

^aTime to diagnosis of participants with no cognitive impairment is their average follow-up time.