TABLE 1.

Demographic characteristics of seven age groups.

Variables	21–30 years	31–40 years	41–50 years	51–60 years	61–70 years	71–80 years	81–90 years	P value
Gender (Male/Female)	37/36	18/23	21/21	202/211	143/162	94/94	12/12	0.983
Age (Mean ± SD)	25.34 ± 2.59	34.39 ± 3.14	46.67 ± 3.09	55.77 ± 2.65	64.97 ± 2.89	74.71 ± 2.70	84.08 ± 2.08	0.000
Education (Mean ± SD)	17.40 ± 1.72	18.15 ± 3.45	13.93 ± 3.61	9.90 ± 4.33	7.87 ± 5.65	3.49 ± 4.61	4.38 ± 4.12	0.000
TIV (cm3) (Mean ± SD)	1,477.32 ± 127.35	1,424.89 ± 113.63	1,423.28 ± 117.98	1,410.87 ± 124.59	1,385.47 ± 121.57	1,343.54 ± 113.32	1,307.07 ± 101.67	0.000
MMSE (Mean ± SD)	29.30 ± 0.86	29.10 ± 1.09	28.19 ± 1.49	28.01 ± 1.83	26.60 ± 3.24	24.26 ± 3.76	24.63 ± 4.18	0.000