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  • Title: The PDQ-39 Spanish version: reliability and correlation with the short-form health survey (SF-36).
    Author: Martínez Martín P, Frades B, Jiménez Jiménez FJ, Pondal M, López Lozano JJ, Vela L, Vázquez A, del Val Fernández J, Diví M, Fabregat N, Tuldrá A, Crespo Maraver MC, Molinero LM.
    Journal: Neurologia; 1999 Apr; 14(4):159-63. PubMed ID: 10363490.
    Abstract:
    BACKGROUND AND METHODS: The Parkinson's Disease Questionnaire (PDQ-39) was the first specific instrument for evaluation of the "health-related quality of life" (QoL) in Parkinson's disease patients. The PDQ-39 has been subjected to adaptation to Spanish language and culture (PDQ-39 Spanish version, PDQ-39SV) and this version has been validated in aspects of internal consistency and construct validity. The present study assess the test-retest reliability and the convergent validity of the PDQ-39SV with a generic QoL instrument (SF-36). RESULTS: Most of the PDQ-39 dimensions showed an adequate consistency-Cronbach's alpha > 0.7 for six dimensions. As a whole, test-retest reliability resulted satisfactory. Two dimensions-activities of daily living and emotional well-being- showed a low grade significant difference (paired Student t-test, p < 0.05) due to improvement in the second survey (at 10 to 14 days from the first one) perhaps related to adjustments of the treatment at the first visit. A strong association (Spearman r, p < 0.001), indicative of convergent validity, was obtained for the PDQ-39 dimensions and the relevant SF-36 scales, as well as for the physical and mental component summary scores of the SF-36. CONCLUSIONS: Taking into account these results and previous studies, it is concluded that the PDQ-39 SV is a reliable measure that has construct validity.
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