Validation of a subjective quality of life questionnaire (S.QUA.LA) in schizophrenia

Abstract 

We developed and validated a self-administered questionnaire (Subjective Quality of Life Analysis, S.QUA.L.A.) to measure subjective quality of life. S.QUA.L.A. is a multidimensional instrument. This scale includes 22 domains of life. It covers traditional areas (food, family relation etc)., and more abstract aspects of life (politic, justice, freedom, truth, beauty and art, love). For each domain, patients are asked to evaluate their degree of satisfaction. They have also to indicate how important this domain is for them. We questioned 92 patients with schizophrenia and 357 para-medical students. The research demonstrated reproducibility, high internal consistency reliability, and sensitivity to change. Principal components analysis with varimax rotation was performed. A five-factor solution was selected, showing a great contribution of different dimensions of the self. Determinants of quality of life were identified by using correlations with Lehman's Quality of Life Interview (QOLI), and with measures of psychopathology and social functioning. Satisfaction approach and QOLI showed the same construct. We confirmed the influence of symptoms of depression and anxiety on subjective quality of life assessment, and the poor impact of disease parameters.

Abbreviations: S.QUA.L.A., Subjective Quality of Life Analysis, GHQ-28, global health questionnaire, QOLI, Quality of Life Interview, PANSS, positive and negative scale syndrome, BPRS, Brief Psychiatric Rating Scale, EAPS, Echelle d'Aptitude PsychoSociale

Keywords: Quality of life, Schizophrenia, Subjective assessment