. 2016 Feb 22;11(2):e0138866. doi: 10.1371/journal.pone.0138866

Table 1. Subject characteristics at baseline.

Characteristic	N-MCI (n = 120)	P-MCI (n = 139)	p-value
Age, years	74.8 ± 7.6	74.8 ± 7.1	>0.5^a
Education, years	15.7 ± 2.9	15.6 ± 2.9	>0.5^a
Sex, % female	28.3	38.1	0.097^b
APOE ε4 carriers, %	41.7	66.2	<0.001^b
MMSE score	27.6 ± 1.7	26.7 ± 1.7	<0.001^a

Values are shown as mean ± standard deviation or percentage. P-values for differences between N-MCI and P-MCI are based on (a) t-test or (b) chi-square test. N-MCI = non-progressive MCI; P-MCI = progressive MCI; APOE = apolipoprotein E; MMSE = Mini-Mental State Examination.