Author(s):
Jorge, Marilia F. S. [UNESP] ; Sousa, Ticiane D. [UNESP] ; Pollo, Camila F. [UNESP] ; Paiva, Bianca S. R. ; Ianhez, Mayra ; Boza, Juliana C. ; Meneguin, Silmara [UNESP] ; Schmitt, Juliano V. [UNESP] ; Nunes, Daniel Holthausen ; Lastoria, Joel C. [UNESP] ; Miot, Hélio A. [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/200872
Origin: Oasisbr
Subject(s): Dermatology; Factor analysis; Health-related quality of life; Psychometrics; Questionnaires; Validity; Dermatology; Dermatology; Factor analysis; Factor analysis; Health-related quality of life; Health-related quality of life; Psychometrics; Psychometrics; Questionnaires; Questionnaires; Validity; Validity
Description
Made available in DSpace on 2020-12-12T02:18:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-08-05
Background: The Dermatology Life Quality Index (DLQI) is the most commonly used instrument for clinical evaluation of the impact on health-related quality of life (HRQOL) in dermatological research protocols. The DLQI's classical psychometric properties have been considered adequate in validation studies from several countries. However, the structure of the DLQI is a matter of discussion, especially concerning the dimensionality and informative properties of its questions according to the item response theory (IRT). Methods: Pooled data from studies in Brazil that utilized the DLQI to assess HRQOL in 14 dermatoses were reanalyzed. Classical psychometrical analysis, dimensionality assessment through parallel analysis and IRT (Samejima's ordinal model) analysis were performed. Results: The sample consisted of 1286 patients with a mean age of 47 years (SD = 16), and the proportion of women was 59% (765). The DLQI scores ranged from 0 to 29, with a median (p25-p75) of 5 (2-11). All items indicated significant correlations with the total DLQI score (rho > 0.54). The Cronbach's alpha result was 0.90 (CI 95% 0.89-0.91). Parallel analysis indicated a unidimensional factor structure. According to IRT analysis, items q6 (sports) and q7 (work/study) exhibited insufficient fit to the model (p < 0.01), while the items that indicated the best discrimination and information functions were q2 (embarrassment), q3 (shopping/gardening), q4 (clothing) and q5 (social/leisure). The ordination of the scores was confirmed for all items. Most items revealed non-uniform behavior according to sex, age and type of disease. Conclusions: The DLQI exhibits adequate psychometric reliability and a unidimensional structure for assessing HRQOL in Brazilian dermatological patients. The DLQI's performance varies in the assessment of HRQOL in heterogeneous samples.
Departamento de Dermatologia Faculdade de Medicina da Unesp Unesp Medical School Campus Universitário de Rubião Jr
Departamento de Enfermagem Unesp Medical School Campus Universitário de Rubião Jr
Health-Related Quality of Life Research Group (GPQual) Learning and Research Institute Barretos Cancer Hospital
Departamento de Dermatologia Universidade Federal de Goiás (UFGO), Av. Esperança, s/n - Chácaras de Recreio Samambaia
Departamento de Dermatologia Universidade Federal Do Rio Grande Do sul (UFRGS), Av. Paulo Gama, 110 - Farroupilha
Disciplina de Dermatologia Universidade Federal de Santa Catarina (UFSC), R. Eng. Agronômico Andrei Cristian Ferreira, s/n - Trindade
Departamento de Dermatologia Faculdade de Medicina da Unesp Unesp Medical School Campus Universitário de Rubião Jr
Departamento de Enfermagem Unesp Medical School Campus Universitário de Rubião Jr
