Table 1.

Comparison of 26 subjects with Parkinson's disease dementia (PDD) versus 25 non-demented individuals with Parkinson's disease (PD-CogNL)

	PDD	PD-CogNL	Δ	P	95% CI
Female, n (%)	8 (31)	11 (44)	−0.13	0.39	−0.39 to 0.14
Age at death (years), mean (SD)	77.4 (6.6)	82.7 (5.6)	−5.3	0.004	−8.7 to −1.8
Age at onset of PD (years), mean (SD)	59 (11)	70 (12)	−11	0.001	−17 to −5
Duration of PD (years), mean (SD)	17.7 (6.6)	12.5 (7.7)	5.2	0.01	1.2–9.3
ApoE e4 carrier, n/N (%)	4/23 (17)	4/20 (20)	−0.03	>0.99	−0.30 to 0.21
White matter total score, mean (SD)	1.2 (1.6)	1.9 (3.0)	−0.7	0.31	−2.0 to 0.6
White matter total score >0, n (%)	13 (50)	13 (52)	−0.02	>0.99	−0.30 to 0.26