Table 2.

Self- and Informant-reported cognitive decline scores on the ECog for the cluster groups and NC group

	Amnestic MCI (n = 115)	Mixed MCI (n = 148)	Cluster-Derived Normal (n = 185)	NC (n = 157)	F or X2	Sig.	Effect size
Self-report
Global Cognition	1.75 (0.5)	1.84 (0.6)	1.72 (0.5)	1.28 (0.3)	F = 41.15	p < .001c,e,f	${\eta }_p^2$ = .17
Memory	2.35 (0.7)	2.28 (0.7)	2.26 (0.7)	1.53 (0.4)	F = 56.19	p < .001c,e,f	${\eta }_p^2$ = .22
Language	1.73 (0.5)	2.03 (0.7)	1.81 (0.6)	1.32 (0.3)	F = 41.38	p < .001c,de,f	${\eta }_p^2$ = .17
Visuospatial	1.43 (0.5)	1.56 (0.6)	1.38 (0.5)	1.12 (0.3)	F = 20.46	p < .001c,e,f	${\eta }_p^2$ = .09
Planning	1.51 (0.5)	1.55 (0.6)	1.41 (0.6)	1.11 (0.2)	F = 22.39	p < .001c,e,f	${\eta }_p^2$ = .10
Organization	1.55 (0.6)	1.67 (0.7)	1.51 (0.6)	1.22 (0.4)	F = 16.73	p < .001c,e,f	${\eta }_p^2$ = .08
Divided Attention	1.90 (0.7)	1.92 (0.7)	1.95 (0.8)	1.39 (0.5)	F = 23.23	p < .001c,e,f	${\eta }_p^2$ = .10
Informant-report
Global Cognition	1.92 (0.7)	1.79 (0.6)	1.50 (0.4)	1.16 (0.3)	F = 59.05	p < .001a,b,c,e,f	${\eta }_p^2$ = .28
Memory	2.49 (0.9)	2.21 (0.8)	1.88 (0.6)	1.27 (0.4)	F = 84.55	p < .001a,b,c,e,f	${\eta }_p^2$ = .30
Language	1.75 (0.7)	1.80 (0.8)	1.42 (0.4)	1.13 (0.2)	F = 43.50	p < .001a,b,c,e,f	${\eta }_p^2$ = .18
Visuospatial	1.61 (0.7)	1.50 (0.6)	1.23 (0.4)	1.07 (0.2)	F = 33.78	p < .001a,b,e,f	${\eta }_p^2$ = .15
Planning	1.72 (0.7)	1.61 (0.7)	1.38 (0.5)	1.10 (0.3)	F = 30.69	p < .001a,c,e,f	${\eta }_p^2$ = .13
Organization	1.88 (0.9)	1.68 (0.8)	1.42 (0.6)	1.16 (0.4)	F = 29.99	p < .001a,c,e,f	${\eta }_p^2$ = .13
Divided Attention	2.09 (0.9)	1.96 (0.8)	1.69 (0.7)	1.25 (0.5)	F = 35.93	p < .001a,c,e,f	${\eta }_p^2$ = .15
Discrepancy score
Global Cognition	−0.18 (0.7)	0.04 (0.8)	0.22 (0.6)	0.12 (0.3)	F = 9.40	p < .001a,e	${\eta }_p^2$ = .05
Memory	−0.14 (1.0)	0.07 (0.8)	0.38 (0.8)	0.26 (0.4)	F = 10.02	p < .001a,e	${\eta }_p^2$ = .05
Language	−0.02 (0.8)	0.24 (1.0)	0.39 (0.7)	0.19 (0.4)	F = 7.70	p < .001a	${\eta }_p^2$ = .04
Visuospatial	−0.18 (0.8)	0.06 (0.8)	0.14 (0.6)	0.05 (0.2)	F = 6.26	p < .001a	${\eta }_p^2$ = .03
Planning	−0.21 (0.9)	−0.06 (0.8)	0.03 (0.7)	0.00 (0.3)	F = 3.50	p = .02	${\eta }_p^2$ = .02
Organization	−0.32 (0.9)	−0.01 (0.9)	0.09 (0.7)	0.06 (0.4)	F = 8.01	p < .001a,e	${\eta }_p^2$ = .04
Divided Attention	−0.19 (1.0)	−0.04 (1.0)	0.26 (0.9)	0.13 (0.5)	F = 5.80	p = .001a	${\eta }_p^2$ = .03

Note: Data are summarized as mean (standard deviation). Range of scores is 1 to 4, with higher scores indicating more cognitive decline compared to 10 years ago; MCI = mild cognitive impairment; NC = normal control.

^aCluster-Derived Normal group differed significantly from the Amnestic group.

^bCluster-Derived Normal group differed significantly from the Mixed group.

^cCluster-Derived Normal group differed significantly from the NC group.

^dAmnestic group differed significantly from the Mixed group.

^eAmnestic group differed significantly from the NC group.

^fMixed group differed significantly from the NC group.