From: Impaired verbal memory in Parkinson disease: relationship to prefrontal dysfunction and somatosensory discrimination
Disease Duration
(yrs, mean ± SD)
UPDRS -- Score
(points, mean ± SD)
SSD Proportion of right answers (95% C.I.)
Total
I
II
III
IV
7.7 ± 4.1
36.7 ± 19.3
2.6 ± 1.7
15.7 ± 7.6
16.5 ± 6.0
6.3 ± 5.4
0.79 (0.75-0.83)*