Abstract
BackgroundThe purpose of this study was to validate the Chinese Catquest-9SF questionnaire in community screenings and explore the correlation between Catquest-9SF scores and Lens Opacities Classification System (LOCS) III cataract grading.MethodsThis was a prospective questionnaire validation study. The Catquest-9SF questionnaire was translated into Chinese and was completed by 104 Chinese cataract patients who were diagnosed in community screening. Rasch analysis was used to assess its psychometric properties, and Spearman correlation coefficient was employed to determine the correlation between Catquest-9SF scores and LOCS III cataract grading.ResultsThe Catquest-9SF questionnaire demonstrated ordered response categories and unidimensionality (item fit statistics range: 0.70–1.35); the PSI and PR of the category probability curves were 2.00 and 0.80, respectively. There was a fair but statistically significant correlation between Catquest-9SF (Q6, Q7, and Q8) and LOCS III scores and a moderate correlation between Q4 in Catquest-9SF and subcapsular components for the better eye (r = − 0.546, p < 0.001).ConclusionThe Chinese version of Catquest-9SF is a valid and reliable questionnaire in community screenings. Thus, this questionnaire may be expected to be an auxiliary tool for preliminary cataract screening use.
Highlights
The purpose of this study was to validate the Chinese Catquest-9SF questionnaire in community screenings and explore the correlation between Catquest-9SF scores and Lens Opacities Classification System (LOCS) III cataract grading
The translation procedures were completed via the following steps: 1 The professor of medical English helped to define the conceptual meaning behind each item; 2 The two bilingual native Chinese ophthalmologists translated the Catquest-9SF questionnaire from English into Chinese independently; 3 The senior consultant reconciled the Chinese translations, which were back translated into English by a third translator; 4 By comparing the original version and the back-translated version, discrepancies between the two versions were identified; 5 The questionnaire was revised and was tested on five other ophthalmologists and five cataract patients to ensure that the items on the questionnaire could be adequately understood; and 6 After thorough discussion of minor revisions, the questionnaire was finalized
Our study demonstrated an ordered threshold in the category probability curves, which means that patients who responded that they had more visual disability for a certain item had more visual disability for that item than people who claimedthat they had less disability
Summary
The purpose of this study was to validate the Chinese Catquest-9SF questionnaire in community screenings and explore the correlation between Catquest-9SF scores and Lens Opacities Classification System (LOCS) III cataract grading. Patient-reported outcomes (PROs), together with Clinicianreported outcomes (CROs) and laboratory tests (or device measurements) are three types of endpoints of diseases. The major representative of formal PROs is reliable and validated multi-item questionnaires [1]. Catquest-9SF has been adopted by the International Consortium for Health Outcomes Measurement (ICHOM) to measure the risk factors for and outcomes of cataracts, which are the main global cause of blindness and vision impairment [9]. Catquest-9SF contained 19 questions, was available in Swedish and was used by the National Swedish Cataract Register to evaluate the visual disability of cataract patients [10]. Its nine-item shortform Rasch-scaled version (Catquest-9SF) was shown to be more reliable and valid in measuring the visual disability outcomes of cataract surgery [7]
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