The PDQ-39 Spanish version: reliability and correlation with the short-form health survey (SF-36).
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.
Martínez Martín
P
P
Department of Neurology, Hospital Universitario de Getafe, Madrid, Spain. pmartinezm@meditex.es
Frades
B
B
Jiménez Jiménez
F J
FJ
Pondal
M
M
López Lozano
J J
JJ
Vela
L
L
Vázquez
A
A
del Val Fernández
J
J
Diví
M
M
Fabregat
N
N
Tuldrá
A
A
Crespo Maraver
M C
MC
Molinero
L M
LM
D000368:Aged; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000175:diagnosis*; D013030:Spain; D011795:Surveys and Questionnaires; D014177:Translations