Table 2. Characteristics of the fMRI sample.

	CTR (n = 15)	PD-CN (n = 69)	PD-MCI (n = 15)	CTR vs PD-CN (p value)	CTR vs PD-MCI (p value)	PD-CN vs PD-MCI (p value)
Age (y)	66.4(9.1)	61.0(10.4)	63.5(8.2)	0.066	0.372	0.378
Sex (M/F)	13/2	46/23	11/4	0.125	0.361	0.616
Education (y)	16.5(2.3)	15.3(2.9)	14.2(3.1)	0.112	0.024	0.204
UPDRS-III	-	18.2(9.1)	21.8(8.9)	-	-	0.161
HY stage	-	1.7(0.5)	1.8(0.4)	-	-	0.297
MoCA	27.9(1.6)	27.6(1.9)	24.0(3.7)	0.615	0.001	<0.001
Disease duration (y)	-	1.2(0.9)	2.4(1.5)	-	-	<0.001

Means are followed by standard deviations. Differences in age, years of education, and MoCA scores were assessed using Student’s T test. Differences in gender were assessed using a χ2 test. CTR, controls; PD-CN, Parkinson’s disease cognitively normal; PD-MCI, Parkinson’s disease with mild cognitive impairment; UPDRS-III, Unified Parkinson’s disease rating scale–Part III; HY stage, Hoehn and Yahr stage; MoCA, Montreal cognitive assessment scale.