Table 1.

Baseline characteristics by group.

	CN	MCI	AD	Group differences
n	147	287	56
Mean age ± SD	73.12 ± 5.92	70.63 ± 7.12	74.11 ± 8.33	CN vs. MCI: p < 0.001 CN vs. AD: p = 0.445 MCI vs. AD: p = 0.001
Sex (female/male)	78/69	130/157	23/33	CN vs. MCI: p = 0.193 CN vs. AD: p = 0.127 MCI vs. AD: p = 0.561
Years of education ± SD	16.56 ± 2.52	16.37 ± 262	15.64 ± 2.68	CN vs. MCI: p = 0.472 CN vs. AD: p = 0.024 MCI vs. AD: p = 0.059
Mean MMSE score ± SD	29.07 ± 1.11	28.16 ± 1.69	23.32 ± 1.85	CN vs. MCI: p < 0.001 CN vs. AD: p < 0.001 MCI vs. AD: p < 0.001