Eliminate the effect of severity of the Personal Outcomes Scale: linear regression in persons with intellectual disability

• Maria Carbó-Carreté ^[1] ; Cristina Cañete-Massé ^[1] ; Maribel Peró-Cebollero ^[1] ; Joan Guàrdia-Olmos ^[1]
  1. [1] Universitat de Barcelona

     Universitat de Barcelona

     Barcelona, España

     
• Localización: Psicothema, ISSN-e 1886-144X, ISSN 0214-9915, Vol. 32, Nº. 3, 2020, págs. 420-428
• Idioma: inglés
• DOI: 10.7334/psicothema2019.353
• Títulos paralelos:
  • Eliminar el efecto de la severidad en la Escala de Resultados Personales: uso de la regresión lineal en personas con discapacidad intelectual
• Enlaces
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• Dialnet Métricas: 1 Cita
• Resumen
  • español

    Antecedentes: la Escala de resultados personales (ERP) se utiliza para evaluar la calidad de vida (CdV) en personas con discapacidad intelectual (DI), pero los resultados pueden estar influenciados por el nivel de gravedad de la discapacidad. Para resolverlo, presentamos la estandarización de la adaptación española de la ERP. Una de las limitaciones de la Teoría Clásica de los Tests es el efecto diferencial en algunos ítems debido a una variable externa. Por esta razón, proponemos el uso de regresiones lineales múltiples. Método: para lograr este objetivo, se utilizó una muestra de 529 personas con DI, 522 profesionales y 462 familiares a quienes se les administró la ERP para realizar un estudio psicométrico en profundidad. Para el análisis, utilizamos la estrategia de corrección mediante múltiples regresiones lineales para generar percentiles, que se corrigieron por el efecto de gravedad de la ID. Resultados: las tablas muestran los percentiles de la puntuación bruta de la ERP, corregida por el efecto de la gravedad de la DI. Conclusiones: la técnica de estandarización utilizada es una opción factible para proporcionar una escala de CdV sin resultados sesgados debido a la gravedad de la DI.

  • English

    Background: The Personal Outcomes Scale (POS) is used to assess quality of life (QoL) in people with intellectual disability (ID) but the results are influenced 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.

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