Evaluation and validation of a patient-reported quality-of-life questionnaire for Parkinson’s disease

Journal of Patient-Reported Outcomes

Table 3 Stepwise multiple regression analysis for PDQoL7 and PDQ-8 scores

Clinical features	Estimate (95% CI)	Standard error	P-value	Adjusted R²
PDQoL7
Disability-Off index	0.15 (0.07, 0.23)	0.04	0.001	0.612
Disability-LID index	0.11 (0.02, 0.21)	0.05	0.024
Non-motor questionnaire score	3.38 (1.98, 4.79)	0.70	< 0.001
PDQ-8
Disability-Off index	0.18 (0.09, 0.27)	0.05	< 0.001	0.536
Disability-LID index	0.15 (0.03, 0.27)	0.06	0.012
Cognitive impairment	2.30 (0.85, 3.75)	0.72	0.002