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Psychometrican analysis and dimensional structure of the Brazilian version of melasma quality of life scale (MELASQoL-BP)

BACKGROUND: Although asymptomatic, melasma inflicts significant impact on quality of life. MELASQoL is the main instrument used to assess quality of life associated with melasma, it has been validated in several languages, but its latent dimensional structure and psychometric properties haven´t been...

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Autores principales: Maranzatto, Camila Fernandes Pollo, Miot, Hélio Amante, Miot, Luciane Donida Bartoli, Meneguin, Silmara
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Sociedade Brasileira de Dermatologia 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4999098/
https://www.ncbi.nlm.nih.gov/pubmed/27579735
http://dx.doi.org/10.1590/abd1806-4841.20165014
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author Maranzatto, Camila Fernandes Pollo
Miot, Hélio Amante
Miot, Luciane Donida Bartoli
Meneguin, Silmara
author_facet Maranzatto, Camila Fernandes Pollo
Miot, Hélio Amante
Miot, Luciane Donida Bartoli
Meneguin, Silmara
author_sort Maranzatto, Camila Fernandes Pollo
collection PubMed
description BACKGROUND: Although asymptomatic, melasma inflicts significant impact on quality of life. MELASQoL is the main instrument used to assess quality of life associated with melasma, it has been validated in several languages, but its latent dimensional structure and psychometric properties haven´t been fully explored. OBJECTIVES: To evaluate psychometric characteristics, information and dimensional structure of the Brazilian version of MELASQoL. METHODS: Survey with patients with facial melasma through socio-demographic questionnaire, DLQI-BRA, MASI and MELASQoL-BP, exploratory and confirmatory factor analysis, internal consistency of MELASQoL and latent dimensions (Cronbach's alpha). The informativeness of the model and items were investigated by the Rasch model (ordinal data). RESULTS: We evaluated 154 patients, 134 (87%) were female, mean age (± SD) of 39 (± 8) years, the onset of melasma at 27 (± 8) years, median (p25-p75) of MASI scores , DLQI and MELASQoL 8 (5-15) 2 (1-6) and 30 (17-44). The correlation (rho) of MELASQoL with DLQI and MASI were: 0.70 and 0.36. Exploratory factor analysis identified two latent dimensions: Q1-Q3 and Q4-Q10, which had significantly more adjusted factor structure than the one-dimensional model: Χ2 / gl = 2.03, CFI = 0.95, AGFI = 0.94, RMSEA = 0.08. Cronbach's coefficient for the one-dimensional model and the factors were: 0.95, 0.92 and 0.93. Rasch analysis demonstrated that the use of seven alternatives per item resulted in no increase in the model informativeness. CONCLUSIONS: MELASQoL-BP showed good psychometric performance and a latent structure of two dimensions. We also identified an oversizing of item alternatives to characterize the aggregate information to each dimension.
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spelling pubmed-49990982016-08-29 Psychometrican analysis and dimensional structure of the Brazilian version of melasma quality of life scale (MELASQoL-BP) Maranzatto, Camila Fernandes Pollo Miot, Hélio Amante Miot, Luciane Donida Bartoli Meneguin, Silmara An Bras Dermatol Investigation BACKGROUND: Although asymptomatic, melasma inflicts significant impact on quality of life. MELASQoL is the main instrument used to assess quality of life associated with melasma, it has been validated in several languages, but its latent dimensional structure and psychometric properties haven´t been fully explored. OBJECTIVES: To evaluate psychometric characteristics, information and dimensional structure of the Brazilian version of MELASQoL. METHODS: Survey with patients with facial melasma through socio-demographic questionnaire, DLQI-BRA, MASI and MELASQoL-BP, exploratory and confirmatory factor analysis, internal consistency of MELASQoL and latent dimensions (Cronbach's alpha). The informativeness of the model and items were investigated by the Rasch model (ordinal data). RESULTS: We evaluated 154 patients, 134 (87%) were female, mean age (± SD) of 39 (± 8) years, the onset of melasma at 27 (± 8) years, median (p25-p75) of MASI scores , DLQI and MELASQoL 8 (5-15) 2 (1-6) and 30 (17-44). The correlation (rho) of MELASQoL with DLQI and MASI were: 0.70 and 0.36. Exploratory factor analysis identified two latent dimensions: Q1-Q3 and Q4-Q10, which had significantly more adjusted factor structure than the one-dimensional model: Χ2 / gl = 2.03, CFI = 0.95, AGFI = 0.94, RMSEA = 0.08. Cronbach's coefficient for the one-dimensional model and the factors were: 0.95, 0.92 and 0.93. Rasch analysis demonstrated that the use of seven alternatives per item resulted in no increase in the model informativeness. CONCLUSIONS: MELASQoL-BP showed good psychometric performance and a latent structure of two dimensions. We also identified an oversizing of item alternatives to characterize the aggregate information to each dimension. Sociedade Brasileira de Dermatologia 2016 /pmc/articles/PMC4999098/ /pubmed/27579735 http://dx.doi.org/10.1590/abd1806-4841.20165014 Text en ©2016 by Anais Brasileiros de Dermatologia http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License which permits unrestricted non-commercial use, distribution, and reproduction in any medium provided the original work is properly cited.
spellingShingle Investigation
Maranzatto, Camila Fernandes Pollo
Miot, Hélio Amante
Miot, Luciane Donida Bartoli
Meneguin, Silmara
Psychometrican analysis and dimensional structure of the Brazilian version of melasma quality of life scale (MELASQoL-BP)
title Psychometrican analysis and dimensional structure of the Brazilian version of melasma quality of life scale (MELASQoL-BP)
title_full Psychometrican analysis and dimensional structure of the Brazilian version of melasma quality of life scale (MELASQoL-BP)
title_fullStr Psychometrican analysis and dimensional structure of the Brazilian version of melasma quality of life scale (MELASQoL-BP)
title_full_unstemmed Psychometrican analysis and dimensional structure of the Brazilian version of melasma quality of life scale (MELASQoL-BP)
title_short Psychometrican analysis and dimensional structure of the Brazilian version of melasma quality of life scale (MELASQoL-BP)
title_sort psychometrican analysis and dimensional structure of the brazilian version of melasma quality of life scale (melasqol-bp)
topic Investigation
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4999098/
https://www.ncbi.nlm.nih.gov/pubmed/27579735
http://dx.doi.org/10.1590/abd1806-4841.20165014
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