Table 1.

Clinical characteristics of the study sample

	Disease Duration
	8 years	9 years	10 years	11 years
Age (years)	68.3 (9.1)	68.7 (8.9)	68.6 (8.9)	69.3 (8.6)
Female (%)	33.5	33.1	32.3	33.5
Hoehn and Yahr Stage (%)
HY I	4.3	3.3	3.2	2.1
HY II	57.3	57.1	50.9	50.1
HY III	30.6	32.0	36.1	35.5
HY IV	6.8	6.5	8.5	10.6
HY V	0.7	1.1	1.3	1.3
Verbal Fluency	18.6 (6.6)	18.4 (6.5)	18.5 (6.8)	17.7 (6.6)
Delayed word recall	3.4 (1.4)	3.4 (1.5)	3.4 (1.4)	3.4 (1.5)
Timed Up and Go	13.3 (7.1)	13.4 (6.9)	13.5 (7.2)	14.2 (7.5)
PDQ-39 Total Score	40.8 (26.3)	41.7 (25.8)	43.3 (26.4)	46.9 (27.0)
Depression Diagnosis (%)	2.4	6.2	9.2	12.4