Table 1.

Characteristics of Uniform Data Set sample at baseline

Characteristics at baseline visit*	PD-MCI n=41	AD-MCI n=191	p-value
Number of visits, mean (SD)	3.5 (1.5)	3.3 (1.3)	0.51
Age at baseline (years), mean (SD)	70.2 (8.5)	79.1 (10.3)	<.001
Education (years), mean (SD)	16.0 (2.5)	15.6 (3.1)	0.40
Male, n (%)	25 (61.0%)	95 (49.7%)	0.19
Non-white race, n (%)	3 (7.3%)	34 (18.0%)	0.10
Age of cognitive decline onset, mean (SD)	67.6 (9.3)	76.5 (10.8)	<.001
Memory domain affected†	26 (63.4%)	182 (95.3%)	<.001
Language domain affected†	2 (4.9%)	29 (15.2%)	0.13
Attention domain affected†	16 (39.0%)	16 (8.4%)	<.001
Executive function domain affected†	24 (58.5%)	65 (34.0%)	0.003
Visuospatial domain affected†	5 (12.2%)	10 (5.2%)	0.10
≥1 APOE e4 allele, n (%)	7 (20.6%)	64 (41.8%)	0.02
Age at PD diagnosis, mean (SD)	62.2 (9.9)	NA	NA

Abbreviations: PD-MCI = mild cognitive impairment due to Parkinson's disease; AD-MCI = mild cognitive impairment due to Alzheimer's disease; SD = standard deviation; APOE = apolipoprotein E; PD = Parkinson's disease; NA = Not applicable

^*Number of participants missing data (PD-MCI, AD-MCI): Education (0,1), race (0,2), age of cognitive decline onset (0,19), APOE genotype (7,38), age of PD diagnosis (3,not applicable)

^†based on clinician's assessment