Validation of Catquest-9SF Questionnaire in a Chinese Cataract Population

Abstract

PurposeTo develop and validate a Chinese version of the Catquest-9SF questionnaire in a cataract population.MethodsThe 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.ResultsA 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).ConclusionThe 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.

Validation, test–retest reliability and norm scores for the Dutch Catquest‐9SF

“…A bottom effect might be attenuated by adding items with low difficulty, around the −1.90 cut‐off, as also suggested by Lin et al. (). Another sign of a possible bottom effect postoperatively is the deviation in the targeting of item difficulty to person ability.…”

“…; Lin et al. ). The ordering of item difficulty is also comparable, although the item ‘ walk on uneven ground ’ seems to be valued slightly different; in the Dutch version, it was associated with a worse vision compared to other translated versions.…”

Preoperative Expectations and Postoperative Outcomes of Visual Functioning among Cataract Patients in Urban Southern China

“…Details regarding the Chinese version of the Catquest-9SF questionnaire has been described previously[16]. The Catquest-9SF questionnaire consisted of 7 questions for performing daily-life activities and 2 global questions about difficulties in general and satisfaction with vision.…”

“…In order to describe patients’ self-assessed outcome after ophthalmic interventions in a more comprehensive way, numerous questionnaires have been developed, and these include VF-12[8], VF-14[11] and VF-15[12]. The nine-item short-form Rasch-scaled Catquest-9SF was reliable and valid in measuring visual disability outcomes of cataract surgery[13–15], and has been validated previously in China[16]. In this study, we used Catquest-9SF questionnaire for patients undergoing the first eye cataract surgery in urban Southern China.…”

Validation of an instrument to assess visual ability in children with visual impairment in China

“…Rasch analysis was used to assess psychometric parameters of the CVAQC-CN, including: (1) ordering of response categories; (2) person separation index (PSI) and reliability (PSR), with a PSI of 2.0 and PSR coefficient of 0.8 indicating that the PRO is capable of discriminating at least three levels of persons' ability;18 19 (3) fit statistics (infit and outfit), which indicate how well items fit the underlying construct, and represented by mean square (MNSQ) statistics (the acceptable cut-off range for MNSQ is between 0.5 and 1.518); (4) principal component analysis of the residuals for dimensionality assessment (a PRO is considered as a unidimensional scale, if the explained variance by the scale is >50%, with the unexplained variance in first contrast having a strength of <2.0 eigenvalues20); (5) targeting (the person–item map shows how well the item difficultly targets person ability; a better targeted PRO has both the person and item means located close to each other); (6) differential item functioning (DIF), which is a measure of item bias by population subgroups when an item is systematically responded to differently by these groups (A DIF value >1.0 logits is notably indicating that the interpretation of scale and results differs by groups 21 22. For this study, DIF by gender and age (≤11 and >11 years) was assessed.)…”