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Xianchai Lin, Mingge Li, Xueying Zhongliu, Minbin Yu; Development of a Chinese version of the Catquest-9SF Questionnaire as a tool for patients with cataract in China. Invest. Ophthalmol. Vis. Sci. 2014;55(13):178.
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The purpose of this study was to develop a Chinese version of the Catquest-9SF Questionnaire (CHI-Catquest-9SF) and to test its reliability and validity in a group of patients with cataract in China.
The Catquest-9SF Questionnaire was translated into Chinese. Preoperative patients were recruited from Zhongshan Ophthalmic Center, and their demographic data and visual acuity were documented. Psychometric properties of the CHI-Catquest-9SF, including internal consistency, test-retest reliability, item-scale correlations and construct validity were tested.
A total of 75 patients were recruited and participated in the study. The non-response rate and the floor and ceiling numbers of the CHI-Catquest-9SF were calculated. The internal consistency was high in most subscales, and Cronbach alpha ranged from 0.70-0.92. The test-retest reliability was excellent (intraclass correlation coefficient >0.89). Patients with worse visual acuity had significantly poorer scores on the CHI-Catquest-9SF. Rasch analysis showed that this version of the questionnaire had order response thresholds and was free from differential item functioning. The items fit a single overall construct and unidimensional by principal components analysis.
The CHI-Catquest-9SF is a reliable and valid tool for assessing the visual disability outcomes of Chinese patients with cataract, and it may be recommended for routine clinical use.
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