Translation, Cross-Cultural Adaptation, and Validation of the Parkinson's Disease Quality of Life Questionnaire (PDQL), the “PDQL-BR”, into Brazilian Portuguese

Table 2

Comparison of the alpha-Cronbach coefficients among studies.

	De Boer et al. [9]	Hobson et al. [2]	Serrano-Dueñas et al. [19]	Present study
PDQL	0.94	0.95	0.92	0.93
Parkinsonian symptoms	0.86	0.87	0.85	0.83
Systemic symptoms	0.80	0.77	0.69	0.65
Emotional function	0.87	0.87	0.78	0.79
Social function	0.82	0.85	0.81	0.80