Table 1:

Clinical characteristics of patient and control groups

	Early Parkinson Disease	Late Parkinson Disease	Alzheimer Disease	Control
Patients, n	13	31	6	20
Hoehn and Yahr stage	I:3, II:10	III:16, IV:12, V:3	/	/
Male/female	5/8	14/17	3/3	5/15
Age, y, mean ± SD	68.3 ± 5.88	71.8 ± 8.95	75.7 ± 9.52	74.8 ± 5.41
Duration, y, mean ± SD	4.30 ± 5.37	9.48 ± 6.86	2.5 ± 3	/
Hasegawa Dementia Scale-Revised, mean ± SD	/	/	12.8 ± 4.76	/

Note:—Age does not differ between patient and control groups (P = .082; 1-way analysis of variance).