This study aims to validate a Spanish version of the Glasgow Depression Scale for Learning Disability (GDS-LD) and of the Glasgow Depression Care Supplement Scale (GDS-CS).
The GDS-LD was administered to 120 adults with mild and moderate intellectual disabilities and the GDS-CS to the staff from their occupational workshops (n = 120) to detect symptoms of depression. Internal consistency, inter-rater reliability, test-retest reliability, criterion validity, construct validity and the feasibility and applicability of both scales were analysed.
Both scales showed an adequate internal consistency (GDS-LD, a = 0.86) (GDS-CS, a = 0.88). Exploratory factor analysis revealed four well-defined factors in GDS-LD and three in GDS-CS. Pearson correlation analysis data has also been carried out with both tools for test-retest and inter-rater, showing good correlations.
In terms, of limitations, the participants were recruited from the same centre, so this could be a problem in terms of generalisation. In addition, the GDS-LD and GDS-CS scales were developed for people with mild and moderate ID; it would be worth it to develop a version for people with severe and profound disabilities.
From its clinical perspective, it will be possible to have a specific tool that assesses the symptoms of depression in the Spanish population with ID. Furthermore, as it is a user-friendly scale; it can be administrated by both mental health and other professionals working in the field of disability.
The Spanish version of the GDS-LD and GDS-CS showed adequate rates of feasibility and reliability to assess symptoms depression among Spanish speaking adults with mild and moderate ID.
The authors would like to thank research staff, study participants and their relatives.
Funding: This study was supported by a grant from Carlos III Research Institute (FIS, ref. no. PI16/00327) through the European Regional Development Fund (ERDF).
Ethical approval: The A LA PAR Foundation’s Ethical Committee approved the study. Only participants who consented to take part in the study were interviewed.
Nuñez-Polo, M.H., Lorenzo-Llamas, E.-M., Alonso-Rodriguez, M.-C., Ayuso-Mateos, J.-L. and Martorell, A. (2023), "Spanish validation of the Glasgow depression scale for people with intellectual disabilities (GDS-LD) and of the Glasgow depression care supplement scale (GDS-CS)", Advances in Mental Health and Intellectual Disabilities, Vol. 17 No. 1, pp. 47-58. https://doi.org/10.1108/AMHID-10-2022-0042
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