Can the prediction model using regression with optimal scale improve the power to predict the Parkinson's dementia?

Table 4 Result of the neuropsychological profiles based on Parkinson's disease with dementia, mean ± SD

Variables	PD-MCI (n = 179)	PDD (n = 110)	P value
K-MMSE	24.3 ± 3.4	18.8 ± 5.6	< 0.001
K-MoCA	19.4 ± 4.9	11.9 ± 5.4	< 0.001
CDR (sum of boxes)	1.6 ± 1.4	5.1 ± 4.9	< 0.001
K-IADL	1.3 ± 2.9	3.0 ± 5.4	0.001
UPDRS (Total UPDRS score)	36.4 ± 17.9	56.1 ± 27.2	< 0.001
UPDRS (Motor UPDRS score)	22.6 ± 10.1	29.4 ± 14.6	< 0.001
H&Y staging	2.2 ± 0.6	2.7 ± 0.8	0.001
Schwab and England ADL	80.0 ± 14.4	65.6 ± 19.8	< 0.001

K-MoCA: Korean version of montreal cognitive assessment; K-MMSE: Korean version of mini mental state examination; CDR: Clinical dementia rating; UPDRS: Untitled parkinson disease rating; H&Y staging: Hoehn and Yahr staging; K-IADL: Korean version of instrumental activities of daily living; Schwab and England ADL: Schwab and England avtivities of daily living scale.