Catquest-9SF questionnaire: validation of the Portuguese version using the Rasch analysis.

Autor:	Antunes HM; Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.; Visão Instituto, Conselheiro Lafaiete, MG, Brazil., Magalhães LC; Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil., Vasconcelos GC; Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil., Trindade BLC; Instituto de Olhos Ciências Médicas, Belo Horizonte, MG, Brazil.; Instituto de Oftalmologia Cançado Trindade, Belo Horizonte, MG, Brazil., Gonzaga ACM; Faculdade Santa Rita, Conselheiro Lafaiete, MG, Brazil., Antunes RPG; Visão Instituto, Conselheiro Lafaiete, MG, Brazil.
Jazyk:	angličtina
Zdroj:	Arquivos brasileiros de oftalmologia [Arq Bras Oftalmol] 2023 Mar-Apr; Vol. 86 (2), pp. 156-163.
DOI:	10.5935/0004-2749.20230014
Abstrakt:	Purpose: The aim of this study was to validate the Portuguese version of Catquest-9SF through its application in a native Brazilian population with cataracts and to determine the correlation of the questionnaire scores with preoperative visual acuity. Methods: A prospective study was conducted to validate the Catquest-9SF questionnaire, which was translated and back-translated, generating a final version in Portuguese. A total of 120 Brazilian patients awaiting cataract surgery were recruited to answer the questionnaire and to document their preoperative data and visual acuity. The Rasch analysis was used to assess the instrument's psychometric properties. Results: The Portuguese version of Catquest-9SF demonstrated an acceptable adjustment of the items (item fit statistics ranging from 0.7 to 1.3), unidimensionality (principal component analysis), and good organization in the item response categories (thresholds of the categories: -2.79, 0.57, and 2.22, respectively). The questionnaire contains items with stable relationships if considered at the same level of visual impairment in the comparison between the two groups (absence of differential item functioning). The separation of people (person separation index, 3.07) was adequate. The visual acuity in the logarithm of the minimum angle of resolution (logMAR) in the best eye with the best optical correction showed a statistically significant correlation with the Catquest-9SF logit score (r=0.282 and p=0.004). Conclusions: The Portuguese version of Catquest-9SF presents evidence of validity and reliability, in addition to being linguistically and culturally understandable for Portuguese-speaking patients born in Brazil. The questionnaire is easy to understand and quick to apply, as it could adequately estimate the subjective visual functioning in patients with cataracts. We found a significant correlation between visual acuity and the questionnaire score.
Databáze:	MEDLINE
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