Validity of the French version of Catquest-9SF and use of an electronic notepad for entering patient-reported outcome measures

Abstract

Background The Catquest-9SF questionnaire is a patient reported outcome measure that quantifies the visual benefits from cataract surgery. The purpose of this study was to translate and adapt the Catquest-9SF questionnaire for France, to assess its psychometric properties via Rasch analysis, and to assess its validity when completed using an electronic notepad. Methods The Catquest-9SF questionnaire was translated following the guidelines of the International Society for Pharmacoeconomics and Outcomes Research. Catquest-9SF and clinical data were collected from patients before and after routine cataract surgery. All questionnaire data were collected via an electronic notepad. Rasch analysis was performed to assess psychometric properties, and sensitivity to change was analysed for patients with complete paired pre- and post-operative questionnaires. Results A complete filled-in preoperative questionnaire was obtained for 848 patients. Rasch analysis showed good precision (person separation: 2.32, person reliability: 0.84), ordered category probability curves, no item misfit, and unidimensionality. The respondents were slightly more able than the level of item difficulty (targeting: −1.12 logits). Sensitivity was analysed on 211 paired questionnaires, and the postoperative questionnaires showed a clear ceiling effect. The effect size was 2.6. The use of an electronic notepad for completing the questionnaire worked out very well after some adjustments. Conclusions The French version of Catquest-9SF has good psychometric properties and is suitable for use in French-speaking patients. The use of the Catquest-9SF questionnaire in an electronic format showed good validity.

Catquest-9SF questionnaire: Validation in a Greek-speaking population using Rasch analysis

“…Catquest-9SF scores were assessed before and following the cataract surgery and a significant improvement in person measures (4.06 logits) was found, similarly to 8 former Catquest validation studies that analyzed both pre-and postoperative data [19, 21-26, 30, 57, 58], showing that the questionnaire is responsive to cataract surgery. Moreover, in our study, the effect size was found to be 1.3, similarly with the effect size of 5 other studies ranging from 1.27 to 2.6 [19,24,26,30,57,58]. The fact that the effect size is higher than 0.8 also confirms the responsiveness of the questionnaire.…”

“…In our study, the Catquest-9SF was successfully translated into the Greek language and, subsequently, the translated version was psychometrically assessed using Rasch analysis. Catquest-9SF scores were assessed before and following the cataract surgery and a significant improvement in person measures (4.06 logits) was found, similarly to 8 former Catquest validation studies that analyzed both pre- and postoperative data [ 19 , 21 – 26 , 30 , 57 , 58 ], showing that the questionnaire is responsive to cataract surgery. Moreover, in our study, the effect size was found to be 1.3, similarly with the effect size of 5 other studies ranging from 1.27 to 2.6 [ 19 , 24 , 26 , 30 , 57 , 58 ].…”

“…The postoperative ceiling effect is probably the cause of mistargeting that appeared after cataract surgery, since a significant number of patients showed no difficulty in daily tasks and had very low logit scores. Validation studies of the French [ 30 ], Italian [ 22 ], and Spanish [ 23 ] version of Catquest-9SF, which evaluated postoperative data, revealed a strong ceiling effect postoperatively, while no ceiling or floor effect was present in the preoperative data of these studies. In contrast, other studies such as the validation studies of the Australian [ 20 ] and Chinese versions [ 27 , 28 , 57 , 59 ], including only preoperative data, revealed no ceiling or floor effect.…”

“…The Catquest questionnaire has been first developed and used in Sweden since 1995 [ 18 ], and, in 2009, a revised 9-item version (short-form), called the Catquest-9SF questionnaire, was validated [ 19 ]. Since then, it has been translated, culturally adapted, and evaluated, in chronological order, in Australia (2009) [ 20 ], Germany and Austria (2013) [ 21 ], Italy (2016) [ 22 ], Spain (2016) [ 23 ], the Netherlands (2017) [ 24 ], Denmark (2018) [ 25 ], England (2018) [ 26 ], China and Malaysia (2018) [ 27 , 28 ], Canada (2020) [ 29 ], and France (2021) [ 30 ].…”

Catquest-9SF questionnaire shows greater visual functioning in bilateral cataract populations: A prospective study

“…These results echo similar studies that show that Catquest-9SF accurately captures treatment effectiveness when analyzed with Rasch-based psychometric methods. [ 12 13 32 33 34 35 ] Its superiority over other alternatives such as the National Eye Institute Visual Function Questionnaire, electronic cataract appropriateness and priority systems and impacts on life questionnaires, and correlation with the newly developed cataract patient-reported outcome measure shows that it can be used as a routine clinical tool for satisfaction and visual functioning. [ 36 ]…”