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Table 1 Spearman’s correlation between PDQoL7/PDQ-8 questionnaire scores and demographic/clinical variables

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

Demographic/clinical parameters Spearman’s Correlation coefficients
PDQoL7 PDQ-8
Age 0.170 0.204
Number of years since diagnosis 0.528** 0.539**
Modified Hoehn & Yahr stage 0.561** 0.552**
PD subtype  − 0.034 0.023
Motor signs 0.018  − 0.052
Onset  − 0.145  − 0.098
Cognitive impairment 0.575** 0.570**
Disability-Off index 0.682** 0.669**
Disability-LID index 0.278* 0.334**
Non-motor questionnaire 0.681** 0.540**
Depressed mood 0.650** 0.593**
EQ-5D-5L index score  − 0.852**  − 0.789**
  1. Strong correlations (≥ 0.50) are indicated in bold
  2. *P < 0.05; **P < 0.01