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

Table 2 General characteristics of the subjects based on Parkinson's disease with dementia, n (%)

Variables	PD-MCI (n = 179)	PDD (n = 110)	P value
Age			0.168
60-74	117 (65.0)	63 (35.0)
75+	62 (56.9)	47 (43.1)
Sex			0.550
Male	78 (63.9)	44 (36.1)
Female	101 (60.5)	66 (39.5)
Education level			0.072
Middle school graduate and below	110 (58.2)	79 (41.8)
High school graduate and above	69 (69.0)	31 (31.0)
Family history of the Parkinson's disease			0.600
No	144 (64.3)	80 (35.7)
Yes	12 (70.6)	5 (29.4)
Family history of the Alzheimer's disease			0.285
No	130 (63.4)	75 (36.6)
Yes	8 (80.0)	2 (20.0)
Carbon monoxide poisoning			0.743
No	158 (62.5)	95 (37.5)
Yes	10 (66.7)	5 (33.3)
Traumatic brain injury			0.277
No	158 (62.0)	97 (38.0)
Yes	10 (76.9)	3 (23.1)
Diabetes			0.508
No	144 (64.0)	81 (36.0)
Yes	35 (59.3)	24 (40.7)
Hypertension			0.304
No	110 (65.5)	58 (34.5)
Yes	69 (59.5)	47 (40.5)
Hyperlipidemia			0.220
No	155 (61.8)	96 (38.2)
Yes	24 (72.7)	9 (27.3)