Table 1.

Demographics data for the PD, PDD, AD, and CON groups.

	Control	AD	PD	PDD
	(n=13)	(n=14)	(n=12)	(n=9)	P-Value	Post-hoc significance (LSD)
	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
Age (yrs)	71.54 (7.45)	71.07 (7.32)	67.5 (4.01)	74.78 (5.12)	0.086
Sex (M:F)	6:7	8:6	5:7	8:1	0.14
Education (yrs)	16.77 (2.09)	16.64 (2.27)	15.33 (2.23)	13.67 (2.18)	0.007	CON, AD >PDD*
MMSE (max 30)	28.92 (1.32)	26.79 (2.45)	28.67 (1.44)	22.22 (2.17)	<0.001	CON, AD, PD>PDD** and CON >AD**
Total UPDRS	NA	NA	19.58 (7.10)	32.89 (5.86)	<0.001	PDD>PD**
Disease Duration (years)	NA	NA	6.38 (4.19)	16.33 (6.92)	<0.001	PDD>PD**

NA= not applicable; n= number; SD = standard deviation

^*p<0.01

^**p<0.001.