Table 2.

Sample stratification according to sex and age.

S. No.	Age Stage	NDHC	AD
1	50–65 middle-age	1176 = 903 ♂+273 ♀	73 = 36 ♂+37 ♀
2	65–75 senior	450 = 307 ♂+143 ♀	229 = 151 ♂+78 ♀
3	76-89 elderly	578 = 374 ♂+204 ♀	699 = 310 ♂+389 ♀
4	90-99 nonagenarian	206 = 71 ♂+135 ♀	262 = 58 ♂+204 ♀
5	>100 centenarian	25 = 5 ♂+20 ♀	18 = 5 ♂+13 ♀
	Total sample	2435 (1660 ♂+775 ♀)	1281 (560 ♂+721 ♀)

Abbreviations: NDHC = non-demented healthy controls subjects; AD = Alzheimer’s disease patients.