The outcome of cataract surgery measured with the Catquest-9SF
The outcome of cataract surgery measured with the Catquest-9SF
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DOI：
10.1111/j.1755-3768.2009.01801.x
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发表时间：
2011-12-01
影响因子：
3.4
通讯作者：
Pesudovs, Konrad
中科院分区：
文献类型：
--
作者：
Lundstrom, Mats;Behndig, Anders;Pesudovs, Konrad
目的：本研究的目的是使用 Catquest-9SF 来测量白内障手术结果，并使用 Rasch 分析来测试该问卷的心理测量特性，包括其有效性和响应性。方法：在瑞典的 6 个手术单位中，患者被招募为连续 1 个月内进行白内障手术的患者（通过国家白内障登记处）。患者在术前和术后3个月完成问卷。使用 3.63.2 版 WINSTEPS 软件（Winsteps.com，Beaverton，OR，USA）评估 Catquest-9SF 数据是否适合 Rasch 模型。分析中包括术前和术后问卷。对白内障手术的反应性计算为效应大小。结果：收到了 846 名患者在手术前后填写的问卷。 Rasch 分析表明类别阈值是有序的。所有物品均适合单一整体构造（合身范围 0.79-1.40；服装范围 0.74-1.40）。区分不同能力阶层的能力良好，患者真实分离度为2.58，患者分离信度为0.87。问卷显示出一维性，并且很大程度上没有差异项目功能。该项目的难度相当适合术前和术后患者的能力。 Catquest-9SF Rasch 评分与视力显着相关，白内障手术带来显着改善，效果大小为 1.8。结论：正如 Rasch 分析所证明的，Catquest-9SF 显示出出色的心理测量特性。它对白内障手术高度敏感，并且其简洁性（九项）使其非常适合在日常临床实践中使用。
Purpose: The purpose of this study was to use the Catquest-9SF to measure cataract surgery outcomes, and to use Rasch analysis to test the psychometric properties of this questionnaire, including its validity and responsiveness.Methods: Patients were recruited as consecutive cataract surgery patients during 1 month at six surgical units in Sweden (via the National Cataract Register). The patients completed the questionnaire before surgery and 3 months after. The Catquest-9SF data were assessed for fit to the Rasch model using version 3.63.2 of the WINSTEPS software (Winsteps.com, Beaverton, OR, USA). Both preoperative and postoperative questionnaires were included in the analysis. The responsiveness to cataract surgery was calculated as the effect size.Results: Completed questionnaires before and after surgery were received from 846 patients. The Rasch analysis showed that the category thresholds were ordered. All items fit a single overall construct (infit range 0.79-1.40; outfit range 0.74-1.40). The ability to discriminate different strata of person ability was good, with a real patient separation of 2.58 and patient separation reliability of 0.87. The questionnaire showed unidimensionality and was largely free from differential item functioning. The item difficulty was reasonably well targeted to both preoperative and postoperative patient ability. The Catquest-9SF Rasch score correlated significantly with visual acuity, and cataract surgery resulted in a significant improvement with an effect size of 1.8.Conclusion: The Catquest-9SF shows excellent psychometric properties, as demonstrated by Rasch analysis. It is highly responsive to cataract surgery, and its brevity (nine items) makes it well suited for use in daily clinical practice.