Table 3.

Comparison of the characteristics of the noncarriers (NCs) with CDR 0 versus CDR 0.5.

Variables	Noncarriers (NCs) CDR 0 (N = 109)	Noncarriers (NCs) CDR 0.5 (N = 8)	P value
Age (years)	39.4 ± 10.2	42.4 ± 12.4	0.552∗
Gender (M/F)	45/64	2/6	0.427∗∗
Education level (years)	14.7 ± 2.7	12.5 ± 3.4	0.068∗
CDR sum of boxes	0.01 ± 0.08	0.6 ± 0.4	<0.0001∗
Logical memory, delayed recall (percentile)	62.2 ± 31.1	44.8 ± 39.4	0.257∗
MMSE	29.1 ± 1.3	28.4 ± 1.6	0.125∗
GDS	1.2 ± 1.5	2.1 ± 2.5	0.285∗
SMCs (number)	10	5	0.001∗∗

^∗Mann-Whitney U test; ^∗∗Fisher's exact test; CDR denotes Clinical Dementia Rating Scale; M denotes male and F denotes female; MMSE denotes Mini-Mental Status Examination; GDS denotes Geriatric Depression Scale; age, education levels, CDR sum of boxes, MMSE, logical memory, and GDS scores are displayed in mean and standard deviation.