Validation of Catquest-9SF in Danish : developing a revised form of the Catquest-9SF – the Danish Catquest-7SF
(2019) In Acta Ophthalmologica 97(2). p.173-177- Abstract
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... (More)
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.
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- author
- Nielsen, Esben ; Lundström, Mats LU ; Pesudovs, Konrad and Hjortdal, Jesper
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- cataract surgery, Catquest, Rasch analysis, subjective outcome
- in
- Acta Ophthalmologica
- volume
- 97
- issue
- 2
- pages
- 173 - 177
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:30242976
- scopus:85053692123
- ISSN
- 1755-375X
- DOI
- 10.1111/aos.13921
- language
- English
- LU publication?
- yes
- id
- a70cede6-8bb4-4754-90a9-d6dc0cab9f69
- date added to LUP
- 2018-10-23 09:30:33
- date last changed
- 2024-04-15 14:44:39
@article{a70cede6-8bb4-4754-90a9-d6dc0cab9f69,
abstract = {{<p>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.</p>}},
author = {{Nielsen, Esben and Lundström, Mats and Pesudovs, Konrad and Hjortdal, Jesper}},
issn = {{1755-375X}},
keywords = {{cataract surgery; Catquest; Rasch analysis; subjective outcome}},
language = {{eng}},
number = {{2}},
pages = {{173--177}},
publisher = {{Wiley-Blackwell}},
series = {{Acta Ophthalmologica}},
title = {{Validation of Catquest-9SF in Danish : developing a revised form of the Catquest-9SF – the Danish Catquest-7SF}},
url = {{http://dx.doi.org/10.1111/aos.13921}},
doi = {{10.1111/aos.13921}},
volume = {{97}},
year = {{2019}},
}