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Table 2 Internal consistency (Cronbach alpha) and item-test correlations between mean domain scores and the summary index score of the PDQ-39 (n = 81).

From: Validation of an Estonian version of the Parkinson's Disease Questionnaire (PDQ-39)

Domain Cronbach alpha Item-test correlation
Mobility 0.85 0.69
Activities of daily living 0.85 0.72
Emotional well-being 0.85 0.83
Stigma 0.86 0.72
Social support 0.84 0.68
Cognition 0.82 0.67
Communication 0.83 0.56
Bodily discomfort 0.81 0.69
  1. All the coefficients were significant (p < 0.05).