Table 1.

Baseline demographic and cognitive characteristics in a conventional normative sample, a robust normative sample and a sample that develops incident dementia within 5 years.

	Conventional normal (n=418)	Robust normal (n=340)	Incident Dementia (n=78)	Incident D vs. Robust Normals
Age, mean (SD), years	78.2 (4.7)	77.4 (4.5)	81.6 (4.4)	p<0.0001
Age Range, years	70.2−89.8	70.2−89.7	72.4−89.8
Gender
Female, %	59.3	57.9	65.4	p=0.23
Male,%	40.7	42.1	34.6
Education (in years)
<12, %	21.0	18.8	30.8	p=0.02
≥12, %	79.0	81.2	69.2
Race
White,%	67.5	67.9	65.4	P=0.19
Black,%	28.0	26.8	33.3
Other,%	4.5	5.3	1.3
Memory tests, mean (SD)
pFCSRT+IR	30.2 (6.4)	31.9 (5.1)	22.3 (6.4)	p<0.0001
70–79	31.2 (6.2)	32.3 (5.1)
80–89	28.4 (6.3)	30.8 (4.7)
LM	19.8 (7.5)	21.1 (7.2)	13.4 (5.7)	p<0.0001
70–79	21.0 (7.3)	21.8 (7.0)
80–89	17.5 (7.3)	19.4 (7.3)

pFCSRT+IR: Picture version of the Free and Cued Selective Reminding Test with Immediate Recall

LM: Logical Memory Subtest of the WAIS-R Immediate Recall

Note:

The conventional normative sample is divided into two subgroups, those who develop dementia within 5 years (incident dementia) and those who remain dementia free for at least 5 years. Compared with the robust normal group, incident dementia subjects were older (p<0.0001) and performed worse on both pFCSRT+IR (p<0.0001) and LM tests (p<0.0001) at baseline.