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19-Nov-2025
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Arch Hellen Med, 43(1), January-February 2026, 62-67 ORIGINAL PAPER Translation, cross-cultural adaptation, reliability and validity P.M. Lykou,1 G.M. Kyriakatis,1 C. Christodoulou,2 Z. Dimitriadis,2 T. Besios1 |
OBJECTIVE The translation of the Disability Assessment for Dementia (DAD) scale into Greek, its cross-cultural adaptation in the Greek population and its validity and reliability in patients with dementia.
METHOD Initially, the process of translating the scale from English to Greek took place, with two researchers doing the forward translation and one performing the backward translation. After discussions among the entire research team and its pilot application to patients, to ensure the understanding of its content, the final version of the DAD scale in Greek was created. The scale was administered to caregivers of 30 patients (24 women and 6 men dementia patients, mean age 82.26±6.80), following the official scale guidelines. The Katz and Lawton scales were used to check validity and a total of two measurements were conducted to check reliability. Statistical analyses using Spearman's rank correlation coefficient and intraclass correlation coefficient (ICC) were performed to check validity and reliability, respectively.
RESULTS The test-retest reliability of the overall DAD scores was found to be excellent (ICC=0.99). The subscale for basic and instrumental activities of daily living of the DAD scale were significantly correlated with Katz (rs=0.79, p<0.001) and Lawton (rs=0.90, p<0.001) scale scores, respectively. The total DAD scale score was significantly correlated with both Katz scale (rs=0.76, p<0.001) and Lawton scale scores (rs=0.92, p<0.001).
CONCLUSIONS DAD-Gr found to be reliable and valid in the Greek population for the assessment of functional independence in patients with dementia.
Key words: Activities of daily living, Alzheimer, DAD-Gr, Dementia, Functionality.
