. Author manuscript; available in PMC: 2016 Feb 14.

Published in final edited form as: J Alzheimers Dis. 2015;47(4):985–993. doi: 10.3233/JAD-143207

Table 1.

Group characteristics of NACC-database participants

	EOAD	EOAD-matched NC	LOAD	LOAD-matched NC
Number	1,449	1,449	4,337	4,337
Gender (% male)	40.8%	40.8%	40.5%	40.5%
Age of Initial Visit (years)^*	62.7 ± 6.8	58.8 ± 6.1	79.2 ± 6.3	75.0 ± 6.8
Age of Onset (years)	57.3 ± 5.7	N/A	74.5 ± 6.3	N/A
Education (years)	15.3 ± 3.0	15.4 ± 3.0	14.8 ± 3.3	15.0 ± 3.1
White/Black/Asian/Other (%)	85/10/2/2	82/13/3/2	83/15/1/1	82/15/2/1

Significant difference in Age of Initial Visit between: EOAD versus EOAD-matched controls: t = 16.25, df 2896, p < 0.0001. LOAD versus LOAD-matched controls: t = 29.84, df 8672, p < 0.0001. EOAD, early-onset Alzheimer’s disease; LOAD, late-onset Alzheimer’s disease; NC, normal controls.