Rasch Validated German Standardised Keratoconus Questionnaire (Korq)
Published 2023 - 41st Congress of the ESCRS
Reference: PP11.12 | Type: Free paper | DOI: 10.82333/eadv-bn61
Authors: Leon Pomberger* 1 , Mats Lundström 2 , Klemens Waser 1 , Haidar Khalil 1 , Marina Casazza 1 , Andreas Honeder 1 , Matthias Bolz 1 , Nino Hirnschall 1
1Ophthalmology,Kepler University Clinic,Linz,Austria, 2Ophthalmology,Lund University,Lund,Sweden
Purpose
Validation of the keratoconus questionnaire (KORQ) in German as a patient reported outcome measures (PROM) tool.
Setting
Methods
The Keratoconus Outcomes Research Questionnaire (KORQ) was specifically developed for keratoconus patients and consists of 18 items concerning visual ability and 11 items concerning keratoconus associated symptoms. Within this study the English version of the KORQ was translated to German and 100 patients with different stages of keratoconus were included and asked to complete the German version of the KORQ. Several psychometric statistical analyses were then performed to evaluate the questionnaire and to delete unnecessary items.
Results
The mean age of the study participants was 35 years (range: 18-74; SD: 11.5), and the mean visual acuity in the better eye was 0.15 logMAR. Contact lens use was reported by 54% of patients, and 44% had undergone corneal cross-linking prior to the study. To validate the KORQ, we conducted several psychometric statistical analyses. The Cronbach's alpha coefficient for the total KORQ was 0.93, indicating very good consistency reliability. Additionally, all Guttman scores were above 0.9. Results of the Rasch analysis and the shortened questionnaire will be presented at the ESCRS meeting.
Conclusions