title: Psychometric evaluation of a Brazilian Portuguese version of the Spitzer Quality of Life Index in patients with low back pain.
abstract: The purpose of this study was to adapt the Spitzer Quality of Life Index and evaluate its reliability in patients with low back pain. The following steps were followed: translation, back-translation, evaluation by a committee, and pretest. The reliability was estimated through stability and homogeneity assessment. The validity was tested comparing scores of the Spitzer (QLI) with the SF-36 and the Roland-Morris. The psychometric properties were evaluated by the self-application on 120 patients. Results showed that the Cronbach's Alpha was 0.77. Intraclass correlation coefficient for test-retest reliability was 0.960 (p<0.001; IC95%: 0.943; 0.972). Spearman s correlation coefficient for test-retest reliability was 0.937 (p<0.001). There was significant correlation between the Spitzer (QLI) scores and the dimensions of the SF-36. A significant negative correlation was found between the Spitzer (QLI) and the Roland-Morris scores (r = - 0.730). The adaptation process was conducted successfully and the questionnaire presented reliable psychometric measures.
authors.affiliation: Centro Universitário, Fundação de Ensino Octávio Bastos, Brazil. rafaelajcv@uol.com.br
authors.forename: Rafaela Cunha Matheus Rodrigues
authors.initials: RC
authors.lastname: Toledo
authors.forename: Neusa Maria Costa
authors.initials: NM
authors.lastname: Alexandre
authors.forename: Roberta Cunha Matheus
authors.initials: RC
authors.lastname: Rodrigues
mesh_terms: D000328:Adult; D001938:Brazil; D003466:Cultural Characteristics; D005260:Female; D006801:Humans; D007802:Language; D017116:Low Back Pain / Q000175:diagnosis; D008297:Male; D011594:Psychometrics; D011788:Quality of Life; D011795:Surveys and Questionnaires