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Table 3 Principal component analysis of the 8 items of PDQ-8

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

Dimension PDQ-8 item Factor loadings
Mobility Q7 0.59
Activity of daily living Q12 0.62
Emotional well-being Q17 0.79
Stigma Q25 0.68
Social support Q27 0.61
Cognitions Q31 0.57
Communication Q35 0.77
Bodily discomfort Q37 0.58
% Variance explained   42.86%
Component eigenvalue   3.4
  1. Principal component factor analysis (without rotation)
  2. Abbreviations: PDQ-8 8-item Parkinson’s disease Questionnaire