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Table 2 Correlation matrix for criterion validity

From: Evaluation of PDQ-8 and its relationship with PDQ-39 in China: a three-year longitudinal study

 

Correlation with PDQ-8-SIa

PDQ-39-SI

0.93**

Age of onset

−0.19**

Duration of disease

0.31**

Education

−0.19*

H&Y stage

0.48**

UPDRS-III

0.47**

LEDD

0.32**

BDI

0.67**

MMSE

−0.20**

  1. aSpearman’s rank correlation
  2. ** P < 0.001; * P < 0.01
  3. Abbreviations: BDI Beck Depression Inventory, H&Y stage Hoehn and Yahr stage, LEDD Levodopa equivalent daily dose, MMSE Mini–Mental Status Examination, PDQ-8 8-item Parkinson’s disease Questionnaire, PDQ-8-SI PDQ-8 summary index, PDQ-39 39-item Parkinson’s disease Questionnaire, PDQ-39-SI PDQ-39 summary index, UPDRS-III Unified Parkinson’s Disease Rating Scale part III
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Health and Quality of Life Outcomes

ISSN: 1477-7525

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