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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