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

Helmer Magalhães Antunes1,2, Lívia de Castro Magalhães1, Galton Carvalho Vasconcelos1

  • 1Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.

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The Portuguese Catquest-9SF questionnaire is valid and reliable for assessing visual functioning in Brazilian cataract patients. Its scores correlate significantly with preoperative visual acuity, aiding in patient evaluation.

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Area of Science:

  • Ophthalmology
  • Health Sciences
  • Psychometrics

Background:

  • Cataract surgery is a common procedure aimed at restoring vision.
  • Patient-reported outcome measures (PROMs) are crucial for evaluating the effectiveness of interventions.
  • The Catquest-9SF is a widely used questionnaire for assessing visual functioning.

Purpose of the Study:

  • To validate the Portuguese version of the Catquest-9SF questionnaire.
  • To assess its applicability in a Brazilian population with cataracts.
  • To determine the correlation between questionnaire scores and preoperative visual acuity.

Main Methods:

  • Translation and back-translation of the Catquest-9SF into Portuguese.
  • Prospective study involving 120 Brazilian patients awaiting cataract surgery.
  • Rasch analysis to evaluate psychometric properties and item response theory.

Main Results:

  • The Portuguese Catquest-9SF demonstrated acceptable item fit, unidimensionality, and good category organization.
  • Adequate person separation index (3.07) and absence of differential item functioning were observed.
  • A statistically significant correlation was found between visual acuity (logMAR) and the Catquest-9SF logit score (r=0.282, p=0.004).

Conclusions:

  • The Portuguese version of Catquest-9SF is valid, reliable, and culturally appropriate for Brazilian patients.
  • The questionnaire is easy to use and effectively estimates subjective visual functioning in cataract patients.
  • A significant correlation between visual acuity and questionnaire scores supports its clinical utility.