Juan I Arraras1, Izaskun Basterra2, Nahia Pereda3, Berta Ibañez4, Sergio Iribarren5, Juan M Cabases6. 1. Unidad de Rehabilitación. Servicio Navarro de Salud. Pamplona, España. Comité científico de BIBLIPRO. 2. Unidad de Psiquiatría. Complejo Hospitalario de Navarra. Pamplona, España. 3. Primeros Episodios Psicóticos. Servicio Navarro de Salud. España. 4. Navarrabiomed-Departamento de Salud-UPNA. Red de Investigación en Servicios Sanitarios en Enfermedades Crónicas (REDISSEC). Pamplona, España. 5. Centro Salud Mental. Servicio Navarro de Salud. Estella, España. 6. Departamento de Economía. Universidad Pública de Navarra (UPNA). Pamplona, España. Comité científico de BIBLIPRO.
Abstract
INTRODUCTION: The Schizophrenia Quality of Life Scale Revision 4 (SQLS-R4) is a disease-specific subjective Quality of Life (QL) questionnaire for patients with schizophrenia. This study assesses the psychometric properties of the SQLS-R4 when applied to a sample of Spanish schizophrenia spectrum outpatients with stable disease. METHODS: The SQLS-R4 and EUROQOL-5D-5L were completed once by 168 schizophrenia and schizoaffective disorder patients. Of these, 61 also completed the WHOQOL-BREF and 50 completed the SQLS-R4 one week later. Psychometric evaluation of structure, reliability and validity was conducted. RESULTS: Multi-trait scaling confirmed the two multiitem scales. Internal consistency for the two scales (Cronbach’s coefficients>0.89) and the whole questionnaire (0.96) was adequate, as was test–retest reliability (intraclass correlation coefficients>0.79). Correlations with related areas of EUROQOL-5D-5L and WHOQOL-BREF (Spearman’s Rho>0.60) supported convergent validity. Divergent validity was confirmed through low correlations with less-related areas of these two questionnaires (Spearman’s Rho<0.30). Patients with higher levels of depression, more acute episodes and schizoaffective disorder had higher QL limitations. CONCLUSIONS: The SQLS-R4 is a reliable and valid instrument when applied to Spanish outpatients with stable disease. The results of our validation study concur with those of other psychometric studies performed in Europe and other cultural areas.
INTRODUCTION: The Schizophrenia Quality of Life Scale Revision 4 (SQLS-R4) is a disease-specific subjective Quality of Life (QL) questionnaire for patients with schizophrenia. This study assesses the psychometric properties of the SQLS-R4 when applied to a sample of Spanish schizophrenia spectrum outpatients with stable disease. METHODS: The SQLS-R4 and EUROQOL-5D-5L were completed once by 168 schizophrenia and schizoaffective disorderpatients. Of these, 61 also completed the WHOQOL-BREF and 50 completed the SQLS-R4 one week later. Psychometric evaluation of structure, reliability and validity was conducted. RESULTS: Multi-trait scaling confirmed the two multiitem scales. Internal consistency for the two scales (Cronbach’s coefficients>0.89) and the whole questionnaire (0.96) was adequate, as was test–retest reliability (intraclass correlation coefficients>0.79). Correlations with related areas of EUROQOL-5D-5L and WHOQOL-BREF (Spearman’s Rho>0.60) supported convergent validity. Divergent validity was confirmed through low correlations with less-related areas of these two questionnaires (Spearman’s Rho<0.30). Patients with higher levels of depression, more acute episodes and schizoaffective disorder had higher QL limitations. CONCLUSIONS: The SQLS-R4 is a reliable and valid instrument when applied to Spanish outpatients with stable disease. The results of our validation study concur with those of other psychometric studies performed in Europe and other cultural areas.
Authors: Victor Peralta; Lucía Moreno-Izco; Elena García de Jalón; Ana M Sánchez-Torres; Lucía Janda; David Peralta; Lourdes Fañanás; Manuel J Cuesta Journal: Front Psychiatry Date: 2021-03-19 Impact factor: 4.157