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To perform an independent evaluation of the psychometric attributes of the Parkinson's Disease-Cognitive Rating Scale (PD-CRS).The study involved patients with Parkinson's disease (PD) free of any impediments preventing them from participating in the required evaluation. Sociodemographic and historical data were collected for use in this observational, cross-sectional study and the following evaluations were employed: Scales for Outcomes in Parkinson's Disease-Motor Scale (SCOPA-Motor), Hoehn and Yahr staging (HY), Clinical Impression of Severity Index for Parkinson's Disease (CISI-PD), Minimental State Examination (MMSE), SCOPA-Cognitive (SCOPA-Cog), Non-Motor Symptoms Questionnaire and PD-CRS. Acceptability, internal consistence, construct validity and precision of the PD-CRS were analysed.The sample consisted of 50 patients, with a mean age of 63.6 +/- 9.3 years. In all, 66% were males, with a history of 9 +/- 5.7 years with PD, in HY stages 1 to 4. Twelve patients (24%) presented data suggestive of dementia. The PD-CRS score was: sub-cortical sub-scale: 60.9 +/- 16.5; cortical sub-scale: 27.9 +/- 4.4; and total PD-CRS: 88.7 +/- 19.8. The mean-median difference was10% of the maximum scores and the total score showed no ceiling or floor effect. Cronbach's alpha was 0.85; the item-total correlations ranged from 0.57 (naming) to 0.73 (working memory), and the homogeneity index of the items was 0.36. Correlation with the MMSE and the SCOPA-Cog was high (rS = 0.53 and 0.77). The PD-CRS score was significantly lower in patients with a low level of schooling and more severe PD according to levels on the CISI-PD and distinguished between patients with and without dementia (70.3 +/- 26.2 versus 94.5 +/- 13; p0.001. The standard error of the measurement was 1.98.The levels of acceptability, internal consistence, construct validity and precision displayed by the PD-CRS were satisfactory.

Objetivo. Realizar una evaluacion independiente de los atributos psicometricos de la Parkinson´s Disease-Cognitive Rating Scale (PD-CRS). Pacientes y metodos. Pacientes con enfermedad de Parkinson (EP) sin impedimentos para la evaluacion requerida. Estudio observacional, transversal, con captacion de datos sociodemograficos, historicos y las siguientes evaluaciones: Scales for Outcomes in Parkinson´s Disease-Escala motora (SCOPA-Motor), estadios de Hoehn y Yahr (HY), Clinical Impression of Severity Index for Parkinson´s Disease (CISI-PD), Minimental State Examination (MMSE), SCOPA-Cognitive (SCOPA-Cog), Non-Motor Symptoms Questionnare y PD-CRS. Se analizaron la aceptabilidad, consistencia interna, validez de constructo y precision de la PD-CRS. Resultados. Se incluyeron 50 pacientes, con una edad media de 63,6 ± 9,3 anos. El 66% eran hombres, con 9 ± 5,7 anos de duracion de la EP, en estadio 1 a 4 de HY. Doce pacientes (24%) presentaban datos sugerentes de demencia. La puntuacion de la PD-CRS fue: subescala subcortical: 60,9 ± 16,5; subescala cortical: 27,9 ± 4,4; y PD-CRS total: 88,7 ± 19,8. La diferencia media-mediana fue < 10% de las puntuaciones maximas, y la puntuacion total no presento efecto suelo ni techo. El alfa de Cronbach fue de 0,85; las correlaciones item-total, de 0,57 (denominacion) a 0,73 (memoria de trabajo), y el indice de homogeneidad de los items, de 0,36. La correlacion con el MMSE y la SCOPA-Cog fue alta (rS = 0,53 y 0,77). La puntuacion de la PD-CRS fue significativamente menor en pacientes con bajo nivel educativo y mayor gravedad de la EP segun niveles de la CISI-PD, y discrimino entre pacientes dementes y no dementes (70,3 ± 26,2 frente a 94,5 ± 13; p < 0,001). El error estandar de la medida fue de 1,98. Conclusion. La PD-CRS mostro aceptabilidad, consistencia interna, validez de constructo y precision satisfactorias.