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Unified Parkinson's disease rating scale characteristics and structure
Author(s) -
MartínezMartín P.,
GilNagel A.,
Gracia L. Morlán,
Gómez J. Balseiro,
MartínezSarriés J.,
Bermejo F.
Publication year - 1994
Publication title -
movement disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.352
H-Index - 198
eISSN - 1531-8257
pISSN - 0885-3185
DOI - 10.1002/mds.870090112
Subject(s) - cronbach's alpha , rating scale , psychology , inter rater reliability , physical therapy , discriminant validity , parkinson's disease , depression (economics) , psychometrics , psychiatry , clinical psychology , internal consistency , disease , medicine , developmental psychology , economics , macroeconomics
Our purpose was to verify some basic aspects of validation of the Unified Parkinson's Disease Rating Scale (UPDRS). One hundred and sixtyseven Parkinson's disease (PD) patients were included. Group A (n=40) was simultaneously assessed by five raters who applied the UPDRS and other PD rating scales (PDRS). A set of timed tests, the Mini‐Mental State Examination (MMSE), and the Hamilton Scale for Depression (HSD) were administered by an independent examiner. Group B (n = 127) was individually assessed through the UPDRS and the other PDRSs by one neurologist in four different hospitals. The UPDRS was administered in 16.95 ± 7.98 min. The internal consistency was high (Cronbach's alpha = 0.96). Nevertheless, the items related to depression, motivation/initiative, and tremor were scarcely consistent. The Interrater reliability was satisfactory (all the items had k > 0.40). There was a high correlation of the UPDRS with the Hoehn and Yahr staging (r s = 0.71; p < 0.001) and some timed tests (finger tapping; arising from chair), but also with the MMSE and HSD (r s = 0.53; r s = 0.64; p < 0.001). The convergent validity with the other PDRS (Intermediate Scale and Schwab and England Scale) was very high (r s = 0.76−0.96; p < 0.001). The factor analysis identified six factors that explained 59.6% of the variance. The dimension “tremor” showed a remarkable independence. The UPDRS is a multidimensional, reliable, and valid scale, with some inconveniences derived from its internal consistency, discriminant validity, and pragmatic application.