Outcomes Assessment in Psychological Treatment: Spanish adaptation of OQ-45 (Outcome Questionnaire)
Evaluación de resultados en el tratamiento psicológico: adaptación española del OQ-45 (Outcome Questionnaire)
Ioseba Iraurgi
,
Patricia Penas
Revista Latinoamericana de Psicología, (2021), 53, pp. 56-63.
Received 13 July 2020
Accepted 8 March 2021
Introducción: El instrumento Outcome Questionnaire (OQ-45) desarrollado por Lambert, se trata de una escala auto-administrada de 45-ítems que se utiliza para medir los resultados clínicos en psicoterapia. Esta herramienta evalúa el funcionamiento por medio de tres áreas: síntomas de malestar, relaciones interpersonales y rol social. El objetivo de este artículo es evaluar la fiabilidad y la validez de la versión española. Método: Una muestra de 639 personas, clínica y no clínica, cumplimentaron dicho instrumento. Resultados: Las evidencias psicométricas del cuestionario mostraron una consistencia interna adecuada (.97 y .91) y una validez convergente aceptable con las siguientes escalas: BDI, STAI, PSS y SF-12. Los análisis factoriales confirmatorios han sugerido una estructura bifactorial. Los puntos de corte se han establecido para las subescalas y la puntuación total (54.5), teniendo en cuenta el criterio clínico, lo que significa que se ha priorizado ligeramente la sensibilidad sobre la especificidad. El RCI ha sido de 3.80 y la puntuación mínima de cambio de 17.56. Conclusión: El OQ-45 ha mostrado propiedades psicométricas aceptables, que apoyan el uso de esta versión para valorar la funcionalidad de los españoles y, como consecuencia, podría ayudar a los clínicos a evaluar la eficacia del tratamiento y establecer objetivos en psicoterapia.
Palabras clave:
Outcome Questionnaire, validación española, OQ-45, propiedades psicométricas, estructura factorial, evaluación de la funcionalidad
Introduction: The Lambert’s Outcomes Questionnaire (OQ-45) is a 45-item self-administered instrument used to measure clinical outcomes in psychotherapy. It measures functioning through three areas: symptoms distress, interpersonal relations and social role. The objective of this paper is to assess the reliability and the validity of its Spanish version. Method: A sample of 639 subjects, non-clinical and clinical, completed the instrument. Results: The psychometric evidences of the questionnaire showed an adequate internal consistency (.97 and .91) and acceptable convergent validity with the BDI, STAI, PSS and SF-12. The Confirmatory Factor Analyses suggested a bifactor structure. The cut-off points have been established for the subscales and total score (54.5), considering the clinical criterion, which means, prioritizing slightly the sensibility over the specificity. The RCI was 3.80 and Minimum Change Score 17.56. Conclusion: The OQ-45 showed acceptable psychometric properties, providing support for using this version of the questionnaire to assess Spanish’s functionality. Given these findings, this tool could help clinicians evaluate treatment efficacy and establish psychotherapy goals.
Keywords:
Outcome Questionnaire, Spanish validation, OQ-45, psychometric properties, factorial structure, functionality assessment
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