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Title: Eliminate the effect of severity of the Personal Outcomes Scale: Linear regression in persons with intellectual disability
Author: Carbó i Carreté, Maria de les Salines
Cañete-Massé, Cristina
Peró, Maribel
Guàrdia Olmos, Joan
Keywords: Discapacitats mentals
Qualitat de vida
Anàlisi de regressió
People with mental disabilities
Quality of life
Regression analysis
Issue Date: 31-Jul-2020
Publisher: Facultad de Psicología de la Universidad de Oviedo y el Colegio Oficial de Psicólogos del Principado de Asturias
Abstract: Background: The Personal Outcomes Scale (POS) is used to assess quality of life (QoL) in people with intellectual disability (ID) but the results are infl uenced by the severity of the disability. To address this issue, we present the standardization of the Spanish adaptation of the POS. One of the limitations of the Classical Test Theory is the differential effect in some items due to the effect of an external variable. For this reason, we propose the use of multiple linear regressions. Method: We used a sample of 529 people with ID, along with 522 professionals and 462 parents who were administered the POS in order to carry out an in-depth psychometric study. For the analysis, we used the correction strategy by multiple linear regressions to generate centiles corrected for the severity effect of ID. Results: Following this technique, the results show the centiles from the raw POS score corrected for the effect of the severity of ID. Conclusions: This standardization technique is a feasible option to provide a QoL scale without biased results due to the severity of ID.
Note: Reproducció del document publicat a:
It is part of: Psicothema, 2020, vol. 32, num. 3, p. 420-428
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ISSN: 0214-9915
Appears in Collections:Articles publicats en revistes (Psicologia Social i Psicologia Quantitativa)

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