Evaluation of the German Version of the Keratoconus Outcomes Research Questionnaire
(2024) In Cornea 43(12). p.1493-1498- Abstract
Purpose: To translate, validate, and evaluate the psychometric properties of the German version of Keratoconus Outcomes Research Questionnaire (KORQ). Methods: This prospective study included 3 phases. In phase 1, the KORQ was translated in a standardized way; in phase 2, Rasch validation was performed; in phase 3, the validated questionnaire was evaluated in a separate patient cohort. All patients answered the German KORQ. Scheimpflug imaging (Pentacam) and optical coherence tomography scans (MS-39) were conducted. Corneal imaging measurements were correlated with patient-reported outcome measures. Results: After standardized translation, 100 patients self-administered the German KORQ. Rasch analysis was conducted for psychometric... (More)
Purpose: To translate, validate, and evaluate the psychometric properties of the German version of Keratoconus Outcomes Research Questionnaire (KORQ). Methods: This prospective study included 3 phases. In phase 1, the KORQ was translated in a standardized way; in phase 2, Rasch validation was performed; in phase 3, the validated questionnaire was evaluated in a separate patient cohort. All patients answered the German KORQ. Scheimpflug imaging (Pentacam) and optical coherence tomography scans (MS-39) were conducted. Corneal imaging measurements were correlated with patient-reported outcome measures. Results: After standardized translation, 100 patients self-administered the German KORQ. Rasch analysis was conducted for psychometric testing of the KORQ. Based on the results of the Rasch analysis, the original German version of the KORQ was modified and any items showing a misfit were excluded. This resulted in a new shortened version of the KORQ, which was evaluated in 30 patients. The revised German KORQ met the criteria of Rasch analysis and showed excellent internal consistency reliability and convergent validity. The correlation between the KORQ score and various clinical measurements was examined using Spearman correlation. A significant moderate correlation was observed between the D (r = 0.237; P = 0.006) and Kmax (r = 0.162; P = 0.065) values of Pentacam. Inverse correlations were observed for thinnest pachymetry measured with MS-39 (r = 20.167; P = 0.058) and best corrected visual acuity (r = 20.210; P = 0.016). Conclusions: The shortened German KORQ met the assumptions of the Rasch model and displayed satisfactory psychometric properties. The German KORQ could be adopted as a powerful patient-reported outcome measures tool for German-speaking patients with keratoconus in the future.
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- author
- Pomberger, Leon ; Tasch, Lisa ; Lundström, Mats LU ; Waser, Klemens ; Khalil, Haidar ; Kronschläger, Martin ; Hirnschall, Nino and Bolz, Matthias
- organization
- publishing date
- 2024-12-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- keratoconus, patient reported outcome measures, psychometric properties, questionnaire, Rasch analysis
- in
- Cornea
- volume
- 43
- issue
- 12
- pages
- 6 pages
- publisher
- Lippincott Williams & Wilkins
- external identifiers
-
- scopus:85208601476
- pmid:38381057
- ISSN
- 0277-3740
- DOI
- 10.1097/ICO.0000000000003506
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2024 Wolters Kluwer Health, Inc. All rights reserved.
- id
- 878125be-5004-41ef-9fff-defe2c728bf5
- date added to LUP
- 2025-01-09 10:38:14
- date last changed
- 2025-07-11 02:06:14
@article{878125be-5004-41ef-9fff-defe2c728bf5,
abstract = {{<p>Purpose: To translate, validate, and evaluate the psychometric properties of the German version of Keratoconus Outcomes Research Questionnaire (KORQ). Methods: This prospective study included 3 phases. In phase 1, the KORQ was translated in a standardized way; in phase 2, Rasch validation was performed; in phase 3, the validated questionnaire was evaluated in a separate patient cohort. All patients answered the German KORQ. Scheimpflug imaging (Pentacam) and optical coherence tomography scans (MS-39) were conducted. Corneal imaging measurements were correlated with patient-reported outcome measures. Results: After standardized translation, 100 patients self-administered the German KORQ. Rasch analysis was conducted for psychometric testing of the KORQ. Based on the results of the Rasch analysis, the original German version of the KORQ was modified and any items showing a misfit were excluded. This resulted in a new shortened version of the KORQ, which was evaluated in 30 patients. The revised German KORQ met the criteria of Rasch analysis and showed excellent internal consistency reliability and convergent validity. The correlation between the KORQ score and various clinical measurements was examined using Spearman correlation. A significant moderate correlation was observed between the D (r = 0.237; P = 0.006) and K<sub>max</sub> (r = 0.162; P = 0.065) values of Pentacam. Inverse correlations were observed for thinnest pachymetry measured with MS-39 (r = 20.167; P = 0.058) and best corrected visual acuity (r = 20.210; P = 0.016). Conclusions: The shortened German KORQ met the assumptions of the Rasch model and displayed satisfactory psychometric properties. The German KORQ could be adopted as a powerful patient-reported outcome measures tool for German-speaking patients with keratoconus in the future.</p>}},
author = {{Pomberger, Leon and Tasch, Lisa and Lundström, Mats and Waser, Klemens and Khalil, Haidar and Kronschläger, Martin and Hirnschall, Nino and Bolz, Matthias}},
issn = {{0277-3740}},
keywords = {{keratoconus; patient reported outcome measures; psychometric properties; questionnaire; Rasch analysis}},
language = {{eng}},
month = {{12}},
number = {{12}},
pages = {{1493--1498}},
publisher = {{Lippincott Williams & Wilkins}},
series = {{Cornea}},
title = {{Evaluation of the German Version of the Keratoconus Outcomes Research Questionnaire}},
url = {{http://dx.doi.org/10.1097/ICO.0000000000003506}},
doi = {{10.1097/ICO.0000000000003506}},
volume = {{43}},
year = {{2024}},
}