Validation of Catquest-9SF in Danish: developing a revised form of the Catquest-9SF – the Danish Catquest-7SF

Research output: Contribution to journalArticle


Purpose: The primary goal was to validate a Danish translated version of the Catquest-9SF by Rasch analysis. The secondary goal was to investigate whether preoperative Catquest-9SF scores, best-corrected visual acuity, comorbidity, gender, age or corneal astigmatism could predict improvements in subjective outcome. Methods: In a prospective trial, 250 patients eligible for cataract surgery were included. Patients filled out the translated Catquest-9SF questionnaire before surgery and again 3 months after surgery. Both preoperative and postoperative questionnaires were included in the Rasch analysis. A multiple reverse stepwise regression model was used to investigate the correlation between preoperative measurements and subjective improvement. Results: The preliminary Rasch analysis showed misfit of items 4 and 6. These items were removed, and the remaining seven items demonstrated a measurement precision of 2.78, a person reliability coefficient of 0.89, ordered response categories, infit of 0.69–1.22, outfit of 0.73–1.14, observed raw variance explained by measures of 70.4% and an eigenvalue of 1.7. Item 7 showed a mild DIF for gender (0.54 logits), and person mean Rasch score targeting was −1.69 logits. Preoperative Catquest score was the only parameter with a significant correlation to a gain in subjective outcome (p < 0.001). A preoperative Catquest-9SF score of 0.5 carried a 95% likelihood of an increase in subjective outcome. Conclusion: The Danish version of the Catquest-9SF fit the Rasch model. Only preoperative Catquest-9SF score was correlated to subjective improvement, and a cut-off value of 0.5 predicted an improvement in subjective outcome with 95% probability.


External organisations
  • Aalborg University
  • Aarhus University Hospital
  • Silkeborg Regional Hospital
  • Australian College of Optometry
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Ophthalmology


  • cataract surgery, Catquest, Rasch analysis, subjective outcome
Original languageEnglish
Pages (from-to)173-177
JournalActa Ophthalmologica
Issue number2
Early online date2018 Sep 21
Publication statusPublished - 2019
Publication categoryResearch