Table 1.

Group differences in demographic information, health history and cognitive tests

	Control (n = 115)	Suspected (n = 53)	Diagnosed (n = 15)	Welch's F	pk
Age, years	76.06 (8.10)	81.47 (7.66)∗∗∗	79.07 (6.01)	8.83 (2,41)	0.001
Education, years	15.04 (2.44)	14.90 (3.99)	14.34 (3.42)	0.30 (2, 34)	NS
Health history, number of 12 chronic conditions/behaviorsa	2.69 (1.31)	2.45 (1.80)	2.64 (1.15)	0.45 (2, 37)	NS
Depression, GDS scoreb	1.66 (1.69)	2.72 (2.43)	2.53 (2.17)	4.71 (2, 35)	NS
Gender – male, n	96 (83.5%)	35 (66.0%)∗∗∗	8 (46.7%)∗∗∗	13.23c	0.001
Family history of cognitive disorders – yes, n	49 (42.6%)	17 (32.1%)	3 (20%)	2.01c	NS
Trail B time, s	105.17 (136.87)	195.45 (176.73)∗∗	356.67 (347.86)∗	32.69 (2, 33)	0.001
Stroop color-word, number of words	34.66 (10.06)	23.04 (9.29)∗∗∗	16.40 (8.93)∗∗∗†	43.28 (2, 39)	<0.001
Animal Fluency, number of words	20.14 (5.16)	15.45 (4.55)∗∗∗	11.27 (3.52)∗∗∗††	43.19 (2,43)	<0.001
Cognistat – construction, pointsd	4.99 (0.97)	4.19 (1.44)∗∗∗	3.20 (2.04)∗∗	11.36 (2,33)	<0.001
Cognistat – memory, pointse	10.58 (1.63)	7.68 (2.87)∗∗∗	6.20 (2.71)∗∗∗	35.24 (2, 33)	<0.001
Cognistat – language, pointsf	27.16 (1.13)	25.46 (2.54)∗∗∗	24.40 (2.80)∗∗	16.73 (2, 31)	<0.001
Cognistat – reasoning, pointsg	13.27 (1.02)	12.32 (1.95)	12.33 (1.57)	6.21 (2,32)	NS
Cognistat – calculation, pointsh	3.92 (0.44)	3.85 (0.66)	3.47 (0.99)	1.70 (2, 32)	NS
Cognistat – attention, pointsi	7.83 (0.64)	7.30 (1.27)	7.07 (1.67)	5.28 (2, 32)	NS
Cognistat – orientation, pointsj	11.97 (0.18)	11.68 (0.85)	10.80 (1.78)	5.98 (2, 30)	NS
MMSE, points out of 30	28.98 (1.24)	27.55 (1.81)∗∗∗	25.53 (3-34)∗∗	20.04 (2, 32)	<0.001
Clock Draw Test – fail, n	22 (19%)	12 (23%)	4 (27%)	0.62c	NS
Objective memory performance (CERAD), percentile score	52.53% (24.09%)	5.19% (9.66%)∗∗∗	15.93% (28.57%)∗∗∗	161.60 (2,36)	<0.001

Values denote numbers with percentages or means with SD in parentheses, except for Welch's F, where d.f. are displayed in parentheses. Post hoc testing revealed significant differences between control and suspected or diagnosed groups:

^∗p < 0.05

^∗∗p < 0.01

^∗∗∗p < 0.001. Post hoc testing revealed significant differences between suspected and diagnosed groups:

^†p< 0.05

^†‡p< 0.01.

^aTwelve health conditions/behaviors: stroke, hypertension, high cholesterol, colon disease, liver problems, phlebitis/circulation problems, cancer, vision problems, diabetes, swallowing problems, and tobacco and alcohol use; possible range: 0-12.

^b15-item GDS scale.

^cχ² test.

^dPossible range: 0-6.

^ePossible range: 0-12.

^fPossible range: 0-28.

^gPossible range: 0-14.

^hPossible range: 0-4.

ⁱPossible range: 0-8.

^jPossible range: 0-12.

^ka adjusting to 0.003.