Dimensionality and psychometric analysis of DLQI in a Brazilian population

Detalhes bibliográficos
Autor(a) principal: Jorge, Marilia F. S. [UNESP]
Data de Publicação: 2020
Outros Autores: 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]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1186/s12955-020-01523-9
http://hdl.handle.net/11449/200872
Resumo: 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.
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spelling Dimensionality and psychometric analysis of DLQI in a Brazilian populationDermatologyFactor analysisHealth-related quality of lifePsychometricsQuestionnairesValidityBackground: 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 JrDepartamento de Enfermagem Unesp Medical School Campus Universitário de Rubião JrHealth-Related Quality of Life Research Group (GPQual) Learning and Research Institute Barretos Cancer HospitalDepartamento de Dermatologia Universidade Federal de Goiás (UFGO), Av. Esperança, s/n - Chácaras de Recreio SamambaiaDepartamento de Dermatologia Universidade Federal Do Rio Grande Do sul (UFRGS), Av. Paulo Gama, 110 - FarroupilhaDisciplina de Dermatologia Universidade Federal de Santa Catarina (UFSC), R. Eng. Agronômico Andrei Cristian Ferreira, s/n - TrindadeDepartamento de Dermatologia Faculdade de Medicina da Unesp Unesp Medical School Campus Universitário de Rubião JrDepartamento de Enfermagem Unesp Medical School Campus Universitário de Rubião JrUniversidade Estadual Paulista (Unesp)Barretos Cancer HospitalUniversidade Federal de Goiás (UFG)Universidade Federal Do Rio Grande Do sul (UFRGS)Universidade Federal de Santa Catarina (UFSC)Jorge, Marilia F. S. [UNESP]Sousa, Ticiane D. [UNESP]Pollo, Camila F. [UNESP]Paiva, Bianca S. R.Ianhez, MayraBoza, Juliana C.Meneguin, Silmara [UNESP]Schmitt, Juliano V. [UNESP]Nunes, Daniel HolthausenLastoria, Joel C. [UNESP]Miot, Hélio A. [UNESP]2020-12-12T02:18:18Z2020-12-12T02:18:18Z2020-08-05info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1186/s12955-020-01523-9Health and Quality of Life Outcomes, v. 18, n. 1, 2020.1477-7525http://hdl.handle.net/11449/20087210.1186/s12955-020-01523-92-s2.0-85089170450Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengHealth and Quality of Life Outcomesinfo:eu-repo/semantics/openAccess2024-08-15T18:46:27Zoai:repositorio.unesp.br:11449/200872Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-15T18:46:27Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Dimensionality and psychometric analysis of DLQI in a Brazilian population
title Dimensionality and psychometric analysis of DLQI in a Brazilian population
spellingShingle Dimensionality and psychometric analysis of DLQI in a Brazilian population
Jorge, Marilia F. S. [UNESP]
Dermatology
Factor analysis
Health-related quality of life
Psychometrics
Questionnaires
Validity
title_short Dimensionality and psychometric analysis of DLQI in a Brazilian population
title_full Dimensionality and psychometric analysis of DLQI in a Brazilian population
title_fullStr Dimensionality and psychometric analysis of DLQI in a Brazilian population
title_full_unstemmed Dimensionality and psychometric analysis of DLQI in a Brazilian population
title_sort Dimensionality and psychometric analysis of DLQI in a Brazilian population
author Jorge, Marilia F. S. [UNESP]
author_facet 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]
author_role author
author2 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]
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Barretos Cancer Hospital
Universidade Federal de Goiás (UFG)
Universidade Federal Do Rio Grande Do sul (UFRGS)
Universidade Federal de Santa Catarina (UFSC)
dc.contributor.author.fl_str_mv 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]
dc.subject.por.fl_str_mv Dermatology
Factor analysis
Health-related quality of life
Psychometrics
Questionnaires
Validity
topic Dermatology
Factor analysis
Health-related quality of life
Psychometrics
Questionnaires
Validity
description 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.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-12T02:18:18Z
2020-12-12T02:18:18Z
2020-08-05
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1186/s12955-020-01523-9
Health and Quality of Life Outcomes, v. 18, n. 1, 2020.
1477-7525
http://hdl.handle.net/11449/200872
10.1186/s12955-020-01523-9
2-s2.0-85089170450
url http://dx.doi.org/10.1186/s12955-020-01523-9
http://hdl.handle.net/11449/200872
identifier_str_mv Health and Quality of Life Outcomes, v. 18, n. 1, 2020.
1477-7525
10.1186/s12955-020-01523-9
2-s2.0-85089170450
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Health and Quality of Life Outcomes
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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