Table 4 Neuropsychological variables by subgroup

	NP normal/CDR normal (n = 1451) Subgroup 1	NP normal/CDR MCI (n = 751) Subgroup 2	NP MCI/CDR normal (n = 381) Subgroup 3	NP MCI/CDR MCI (n = 480) Subgroup 4	ANOVA F
Episodic memory
CVLT long delay recall	9.9 (2.8)^a	8.8 (2.9)^b	7.9 (3.2)^c	6.3 (2.9)^d	173.79***
R-O delayed recall	17.3 (4.0)^a	16.9 (4.0)^a	13.2 (5.2)^b	11.9 (5.2)^c	234.65***
Attention/perceptual speed
Digit span forward	6.3 (1.3)^a	6.1 (1.3)^a	5.9 (1.3)^b	5.8 (1.3)^b	14.83***
Trails A (s)	39.5 (11.8)^a	42.6 (12.1)^b	50.0 (18.5)^c	54.8 (24.3)^d	113.06**
Visuospatial construction
R-O copy (24 points)	22.6 (1.7)^a	22.7 (1.6)^a	20.6(3.0)^b	20.6 (3.2)^b	176.00**
Block design (24 points)	13.2 (3.8)^a	12.1 (3.8)^b	9.7 (4.6)^c	8.7 (4.3)^d	168.91***
Language
30 point BNT	27.4 (2.2)^a	27.0 (2.5)^b	25.6 (3.4)^c	24.5 (3.9)^d	134.11***
Category fluency	17.1 (4.2)^a	16.3 (3.9)^b	14.2 (4.2)^c	13.0 (3.6)^d	133.49***
Executive functions
Trails B (s)	95.0 (33.0)^a	111.1 (40.3)^b	127.9 (49.6)^c	148.7 (55.1)^d	192.70***
Stroop interference	83.2 (19.9)^a	76.9 (19.5)^b	66.1 (23.1)^c	59.8 (22.0)^d	151.20***

Values are mean (SD).
Overall Fs reported for ANCOVAS with age, education, race and CESD score included as covariates. Means within a given row with different superscripts (^{a, b, c, d}) are statistically different at p<0.05 by Student–Neuman–Keuls procedure.
***p<0.001.
BNT, Boston Naming Test; CDR, Clinical Dementia Rating; CESD, Center for Epidemiological Studies Depression Scale; CVLT, California Verbal Learning Test; MCI, mild cognitive impairment; NP, neuropsychological; R-O, Rey–Osterrieth.