. 2013 Feb 20;8(2):e57333. doi: 10.1371/journal.pone.0057333

Table 1. Comparison among NC, aMCI and mild AD stratified by age and education.

	Group 1				Group 2				Group 3				Group 4
	NC	aMCI	AD	F(P)	NC	aMCI	AD	F(P)	NC	aMCI	AD	F(P)	NC	aMCI	AD	F(P)
N	336	206	86		313	192	72		201	236	138		301	264	125
Age	58.0 (4.4)	57.3 (4.8)	56.8 (5.1)	2.75 (0.06)	60.7 (5.0)	60. 4 (5.4)	59.3 (4.7)	2.16 (0.12)	74.3 (4.1)	74.8 (4.1)	75.2 (4.5)	2.11 (0.12)	73.5 (5.5)	73.9 (4.6)	74.6 (4.1)	2.25 (0.10)
Education	8.7 (1.9)	9.0 (1.6)	8.7 (1.8)	2.28 (0.10)	13.7 (1.6)	13.6 (1.7)	13.2 (1.4)	2.23 (0.11)	9.5 (2.0)	9.6 (2.4)	9.1 (2.6)	2.28 (0.10)	14.2 (1.8)	14.4 (1.8)	14.0 (1.6)	2.65 (0.07)
Sex	173:163	89:117	41:45	1.76 (0.17)	167:146	108:84	33:39	1.14 (0.32)	99:102	129:107	72:66	0.63 (0.53)	172:129	164:100	72:53	0.79 (0.45)
MMSE	28.1 (1.7)^##	27.0 (1.9)^**	21.0 (3.1) ^††	421.9 1 (0.00)	28.5 (2.8)^##	27.2 (1.9)^**	21.2 (3.2) ^††	220.62 (0.00)	27.5 (1.7)^##	26.4 (2.0)^**	20.8 (2.6) ^††	445.50 (0.00)	28.0 (1.7)^##	26.8 (1.7)^**	20.8 (2.9) ^††	580.8 (0.00)
STT-A	54.8 (19.8)^##	70.0 (32.3)^**	132.4 (75.1) ^††	155.85 (0.00)	49.3 (17.4)^##	70.6 (33.6)^**	117.7 (73.1) ^††	117.40 (0.00)	65.2 (24.5)^##	88.3 (40.9)^**	119.3 (59.0) ^††	69.04 (0.00)	55.8 (17.9)^##	74.1 (32.9)^**	120.0 (69.1) ^††	128.4 (0.00)
STT-B	146.8 (47.8)^##	198.6 (103.3)^**	289.1 (118.6) ^††	84.72 (0.00)	136.3 (50.2)^##	195.3 (84.3)^**	292.0 (133.1) ^††	112.22 (0.00)	197.3 (62.6)^##	259.0 (95.8)^**	321.8 (134.1) ^††	59.81 (0.00)	157.5 (49.7)^##	219.2 (91.9)^**	285.0 (123.2) ^††	98.60 (0.00)

Group 1: age ≤65yrs, formal education years ≤12yrs; Group 2: age ≤65yrs, education >12yrs; Group 3: age >65yrs, education ≤12yrs; Group 4: age >65yrs, education >12yrs.

The data are presented as mean (Standard Deviation).

Comparison between NC group and aMCI group was marked behind “aMCI group”,

^**

P<0.01.

Comparison between aMCI group and AD group was marked behind “AD group”,

^††

P<0.01.

Comparison between NC group and AD group was marked behind “NC group”,

^##

P<0.01.