Validation of Catquest-9SF questionnaire in a Chinese cataract population

Xianchai Lin; Mingge Li; Mei Wang; Yajing Zuo; Siping Zhu; Yongxin Zheng; Xiaofeng Lin; Minbin Yu; Ecosse L Lamoureux

doi:10.1371/journal.pone.0103860

Validation of Catquest-9SF questionnaire in a Chinese cataract population

PLoS One. 2014 Aug 1;9(8):e103860. doi: 10.1371/journal.pone.0103860. eCollection 2014.

Authors

Xianchai Lin¹, Mingge Li¹, Mei Wang², Yajing Zuo¹, Siping Zhu¹, Yongxin Zheng¹, Xiaofeng Lin³, Minbin Yu¹, Ecosse L Lamoureux⁴

Affiliations

¹ State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China.
² Department of Ophthalmology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.
³ Shantou Central Hospital, Shantou, China.
⁴ Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore; Duke-National University of Singapore Graduate Medical School, Singapore, Singapore; Centre for Eye Research Australia, University of Melbourne, Melbourne, Australia.

Abstract

Purpose: To develop and validate a Chinese version of the Catquest-9SF questionnaire in a cataract population.

Methods: The Catquest-9SF Questionnaire was translated and back translated into Chinese. Preoperative patients were recruited at a tertiary eye hospital and their demographic information and visual acuity were documented. Psychometric properties of the Catquest-9SF, including ordered thresholds, the ability to distinguish between different strata of person ability, absence of misfitting items, unidimentionality, differential item functioning (DIF) and construct validity were tested, using Rasch analysis.

Results: A total of 102 patients (100% response rate) were enrolled. The participants'mean age was 70.2 year (SD = 12.1) and 46.9% were female. Rasch analysis showed that this version of the questionnaire had ordered response thresholds and was free of DIF. The items fit a single overall construct and unidimensional by principal components analysis of the residuals. Patients with visual impairment had significantly poorer Rasch scores on the Catquest-9SF (mean change, -2.5, p = 0.035, compared with non-visually impaired patients).

Conclusion: The Chinese version of Catquest-9SF is a valid and reliable questionnaire for assessing the visual disability outcomes of Chinese patients with cataract, and it may be recommended for routine clinical use.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Aged
Cataract*
Female
Humans
Male
Middle Aged
Surveys and Questionnaires*

Grants and funding

Dr. Lin Xianchai is funded by National Natural Science Foundation of China 81200685. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.