title: Validation Study of the Spanish Version of the Disability Assessment for Dementia Scale.
abstract: The aim of this study was to determine reliability and validity of the Spanish version of the Disability Assessment for Dementia Scale (DAD-E) in the following areas: content, response process, internal structure, and relation to other constructs.We designed a cross-sectional observational study. The DAD-E was administered to 132 participants diagnosed with mild cognitive decline, prodromal Alzheimer disease, Alzheimer disease, or no cognitive decline. For the reliability study, we performed analyses of internal consistency, test-retest, and equivalent measures. To study validity, we performed item analysis, principal components analysis, and correlations with other measures.The sample was composed of 37 healthy participants (28%) and 95 patients (72%). In the total scale, Cronbach alpha was 0.963, intraclass correlation coefficient in the test-retest analysis was 0.983 (95% CI [95% confidence interval] = 0.969-0.991), and the analysis for equivalent measures was 0.949 (95% CI = 0.897-0.975). Out of the 40 items, we found that 37 presented a correlation index with the total score above 0.40. The principal components analysis suggests that 61.7% of the variance is explained by a single component that groups all scores on Activities of Daily Living. The DAD total score presents correlations with Barthel's Index of 0.882 (P = 0.000) and with Lawton and Brodie's Index of 0.877 (P = 0.000) and with the Mini Mental State Examination of 0.679 (P = 0.000).The DAD-E is a reliable and valid instrument to assess functional disability in people with cognitive decline in Spanish population.
authors.affiliation: From the Universidad Miguel Hernández School of Medicine (AS-P); Department of Health Psychology. Universidad Miguel Hernández (SL-R, MAP); Neurology Service, Hospital General Universitario de Alicante (APP); Department of Pathology and Surgery, Occupational Therapy, Universidad Miguel Hernández (PPG, MHP); and Ctra, Alicante-Valencia Km 8.7, San Juan de Alicante, Spain (Alicante, España).
authors.forename: Alicia
authors.initials: A
authors.lastname: Sánchez-Pérez
authors.forename: Sofía
authors.initials: S
authors.lastname: López-Roig
authors.forename: Ana Pampliega
authors.initials: AP
authors.lastname: Pérez
authors.forename: Paula Peral
authors.initials: PP
authors.lastname: Gómez
authors.forename: María Ángeles
authors.initials: MÁ
authors.lastname: Pastor
authors.forename: Miriam Hurtado
authors.initials: MH
authors.lastname: Pomares
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D003430:Cross-Sectional Studies; D003704:Dementia / Q000175:diagnosis / Q000534:rehabilitation*; D004185:Disability Evaluation; D006233:Persons with Disabilities / Q000534:rehabilitation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D013030:Spain; D011795:Surveys and Questionnaires