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Objective: To validate and evaluate diagnostic accuracy of the Global Deterioration Scale (GDS) in a population of a specialized unit of Lima. Patients Comparte MEDICINA Custodio N, Becerra-Becerra Yc, Alva-Diaz C, Montesinos R , Lira D, Herrera-Pérez E. Enero Junio 2017 Pág 15 and Methods: This research is a comparative cross-sectional descriptive design. The study included 215 individuals selected openly, who attending in the diagnostic unit of cognitive impairment and dementia prevention. Three groups were studied: 60 controls, 40 individuals diagnosed with mild cognitive impairment (MCI) and 115 with dementia diagnosis. They were assessments in three phases: screening, diagnosis and staging of dementia and type of dementia. The validity and reliability of the classification of severity was demonstrated by measuring the correlation between the GDS with the CDR (Clinical Dementia Rating). The diagnostic accuracy of GDS was evaluated by obtaining the values of sensitivity and specificity. Results: The average age was 69, 70, and 74 years for controls, patients with MCI and patients with dementia respectively. GDS had a good correlation with CDR (Spearman r = 0.97, P = 0.0001). The sensitivity of the GDS to set stage of dementia for any category of dementia was 79 % and specificity of 100 % according to standard diagnostic criteria and according to CDR. Conclusions: We demonstrated an almost perfect correlation between GDS and CDR, however GDS has a moderate sensitivity to set the stage dementia regarding CDR also proving to be useful in the diagnosis of MCI.

Validación y precisión de la escala de deterioro global (GDS) para establecer severidad de demencia en una población de Lima