Catquest-9SF questionnaire: validation of Malay and Chinese-language versions using Rasch analysis (original) (raw)
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Catquest questionnaire: re-validation in an Australian cataract population
Clinical & Experimental Ophthalmology, 2009
Background: The Catquest questionnaire was developed using traditional methodology to enable cataract surgery outcomes assessment in European countries. Recently, it has been validated using Rasch analysis in a Swedish population resulting in the Catquest-9SF. The aim of the present study was to assess the performance of the Catquest and the Catquest-9SF questionnaires using Rasch analysis in Australian cataract patients.
Rasch Analysis of the Quality of Life and Vision Function Questionnaire
Optometry and Vision Science, 2009
Purpose. The Quality of life and Vision Function Questionnaire (QOL-VFQ) was developed using classical test theory to assess outcomes of cataract surgery. The aim of this study was to examine the psychometric properties of this questionnaire using Rasch analysis in a cataract population. Methods. The 17-item QOL-VFQ was self-administered to 389 patients waiting to undergo cataract surgery. The QOL-VFQ and its five subscales were assessed for fit to the Rasch model. Rasch analysis was used to estimate interval level measures of "visual ability" from ordinal scores for the QOL-VFQ and its five subscales. Unidimensionality, item fit, response category performance, and targeting of items to patients were assessed. Results. The QOL-VFQ and its five subscales showed ordered category thresholds. Despite removal of two misfitting items the person separation reliability was high and the QOL-VFQ could distinguish among three strata of patient ability. However, there was suboptimal targeting of patient ability to item difficulty as most of the patients had higher levels of visual functioning. None of the subscales demonstrated acceptable psychometric properties. Conclusions. These results support the good overall functioning of the QOL-VFQ in patients with cataract. However, adding more items, that suit the more able patients including those who are awaiting cataract surgery in the fellow eye, will help improve the targeting. (Optom Vis Sci 2009;86:E836-E844)
Psychometric Properties of the Vietnamese Catquest-9 Short Form Questionnaire
Optometry and Vision Science, 2020
SIGNIFICANCE: The Catquest-9 Short Form (SF) has good psychometric properties but was not available in Vietnamese. This study provides the Vietnamese Catquest-9SF and evidence supporting for its use in hospital settings along with clinical assessment to evaluate visual function. PURPOSE: The purpose of this study was to evaluate the psychometric properties of the Vietnamese Catquest-9SF. METHODS: Literate patients with unilateral/bilateral cataract, without severe systemic and ocular comorbidities, aged 50+ years, and scheduled for first-eye surgery were screened and recruited at the University of Medicine and Pharmacy at Ho Chi Minh City and Trung Vuong Hospital. Age, sex, and education were self-reported. The Catquest-9SF and the 25-item National Eye Institute Visual Function Questionnaire were used to assess vision-related quality of life (VRQOL). Best-corrected unilateral and bilateral log of the minimum angle of resolution (logMAR) visual acuity was measured, as was best-corrected Pelli-Robson contrast sensitivity. Rasch analysis was performed on the Vietnamese version of the Catquest-9SF. Criterion validity and convergent validity were also evaluated. RESULTS: Andrich thresholds and response categories on each Catquest-9SF item were ordered, indicating that patients were able to discriminate VRQOL levels. Person separation index and reliability were 2.51 and 0.86, respectively, indicating that the Catquest-9SF was able to distinguish between patients with low-and high-vision difficulties. The tool was unidimensional, with all items fitting well within the construct. There was no evidence of differential item functioning by sex, age group, or cataract status. The tool also showed criterion validity, correlating significantly with visual acuity in the better eye (r = −0.46), the worse eye (r = −0.39), and both eyes (r = −0.44), and with contrast sensitivity for the better eye (r = 0.41), the worse eye (r = 0.32), and both eyes (r = 0.39). A strong correlation between the Catquest-9SF and the 25-item National Eye Institute Visual Function Questionnaire (r = 0.87) indicated convergent validity. CONCLUSIONS: The Vietnamese Catquest-9SF is valid and psychometrically robust for assessing VRQOL among cataract patients.
BMC Ophthalmology, 2021
Background The Quality of Life Impact Refractive Correction (QIRC) questionnaire is a Rasch-validated instrument to assess the quality of life of ametropes with refractive correction. The original QIRC was validated in the United Kingdom. This study aimed to validate the Malay version of the QIRC among refractive correction wearers in Malaysia using Rasch analysis. Methods The original 20-item QIRC was forward-backward translated into Malay in preparation for the Pilot Malay QIRC. The pilot version was pre-tested on 105 spectacle/contact lens-corrected myopes, and the results were reviewed and cross-culturally adapted to produce the Final Malay QIRC. The final version was self-administered to a new sample of 304 participants. A Rasch analysis was conducted to evaluate the items and response categories of the Pilot and the Final Malay QIRC. Test-retest reliability was also analysed on the Final Malay QIRC. Results Based on the pre-test findings, Rasch analysis revealed a multidimensi...
Ophthalmic Epidemiology, 2008
To assess and re-engineer the Vision Core Measure 1 (VCM1) questionnaire in low vision (LV) and cataract participants using Rasch analysis. Methods: 295 participants drawn from a low vision clinic and 181 from a cataract surgery waiting list completed the 10-item VCM1. Unidimensionality, item fit to the model, response category performance, differential item functioning (DIF) and targeting of items to patients were assessed. Category collapsing and item removal were considered to improve the questionnaire. Results: The initial fit of the VCM1 (combined populations) to the Rasch model showed lack of fit (χ2 = 83.3, df = 50, p = 0.002). There was evidence of DIF between the two populations which could not be resolved. Consequently, each population was assessed separately. Irrespective of the population, disordering of response category thresholds was evident. However, collapsing categories produced ordered thresholds and resulted in fit to the Rasch model for the LV (Total χ2 = 41.6, df = 30; p = 0.08) and cataract population (Total χ2 = 17.9, df = 20, p = 0.59). Overall, the VCM1 behaved as a unidimensional scale for each population and no item showed evidence of DIF. Item targeting to patients was however sub-optimal particularly for the cataract population. Conclusion: The VCM1 questionnaire could be improved by shortening the response scale, although different response categories are required for cataract and LV populations. Calibration of items also differed across populations. While the VCM1 performs well within the Rasch model, in line with its initial purpose, it requires the addition of items to satisfactorily target low vision and cataract populations.
Catquest-9SF questionnaire: Validation in a Greek-speaking population using Rasch analysis
PLOS ONE, 2022
The Catquest-9SF questionnaire is a tool measuring visual disability and vision-related limitation in patients' daily activities. The primary objective of this study was the validation of Catquest-9SF in a Greek-speaking cataract population. Methods The questionnaire was translated into Greek and translated back into English. A pre-final Greek version was formed and tested by 10 Greek-English bilingual participants and by the translation team, and the final version was produced. Patients scheduled for cataract surgery completed the questionnaire preoperatively and postoperatively. Rasch analysis was performed for the assessment of the Catquest-9SF psychometric properties, including response category ordering, item fit statistics, principal components analysis, precision, differential item functioning and targeting for preoperative and postoperative data collectively. Results A total of 100 (55 men, 45 women, mean age = 71.94±6.63) cataract patients completed the Greek version of Catquest-9SF questionnaire preoperatively and postoperatively. Rasch analysis showed a significant improvement in the median person Rasch score from −1.49 preoperatively to −4.71 logits postoperatively, while the effect size was 1.3. Unidimensionality was confirmed since infit and outfit mean square values varied between 0.66 and 1.37. Rasch analysis showed good precision and separation ability (Person Separation Index of 3.28, and Person Reliability of 0.92). Four response categories were found for all items. The item-person means difference was-1.83 logits. The difference between preoperative and postoperative Catquest-9SF logit score was positively correlated with preoperative Catquest-9SF logit score (coeff. = 0.798, p<0.0001) and negatively correlated with postoperative spherical equivalent (coeff. =-0.825, p = 0.011).
Investigative Ophthalmology & Visual Science, 2003
PURPOSE. The Activities of Daily Vision Scale (ADVS) has been extensively validated by traditional methodology. In the current study, Rasch analysis was used to explore further the validity of the ADVS and to determine whether improvements could be made. METHODS. Forty-three patients with cataract underwent visual acuity (VA) and contrast sensitivity (CS) testing and completed the ADVS. The data were Rasch analyzed and the value of response scale and item reduction explored. A shortened version and the original ADVS were tested for criterion validity by determining correlations with VA and CS. RESULTS. The ADVS data contained nonnormally distributed items and items with ceiling effects and empty response categories. Therefore, items benefited from shortening the response scale, the optimum length being three responses. There was poor targeting of item difficulty to patient ability, because many patients with cataract were sufficiently able that they had no difficulty with many activities. Items were eliminated if the task was too easy or did not fit with the overall concept of visual disability determined by the Rasch model. A reduced ADVS version was established that had adequate precision, equivalent criterion validity, and improved targeting of item difficulty to patient ability, but this version was still not ideal. CONCLUSIONS. Despite careful traditional validation, the ADVS data contained inadequacies exposed by Rasch analysis. Through Rasch scaling, particularly with response scale reduction, the ADVS can be improved, but additional questions seem to be needed to suit the more able, including patients undergoing second eye cataract surgery. There remains a need to develop Rasch-scaled measures of visual disability for use in ophthalmic outcomes research. (Invest Ophthalmol Vis Sci.
Australasian Journal on Ageing, 2014
Aim: To determine the test-retest repeatability of the National Eye Institute 25-item Visual Function Questionnaire (NEI VFQ-25) for use with older Vietnamese adults with bilateral cataract. Methods: The questionnaire was translated into Vietnamese and back-translated into English by two independent translators. Patients with bilateral cataract aged 50 and older completed the questionnaire on two separate occasions, one to two weeks after first administration of the questionnaire. Test-retest repeatability was assessed using the Cronbach's α and intraclass correlation coefficients. Results: The average age of participants was 67 ± 8 years and most participants were female (73%). Internal consistency was acceptable with the α coefficient above 0.7 for all subscales and intraclass correlation coefficients were 0.6 or greater in all subscales. Conclusion: The Vietnamese NEI VFQ-25 is reliable for use in studies assessing vision-related quality of life in older adults with bilateral cataract in Vietnam. We propose some modifications to the NEI-VFQ questions to reflect activities of older people in Vietnam.