Comparison of scoring approaches for the NEI VFQ-25 in low vision.
Comparison of scoring approaches for the NEI VFQ-25 in low vision.
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DOI：
10.1097/opx.0b013e3181e61bd8
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发表时间：
2010-08
期刊：
影响因子：
--
通讯作者：
Bullimore MA
中科院分区：
文献类型：
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作者：
Dougherty BE;Bullimore MA
本研究的目的是评估低视力患者对NEI VFQ-25评分的不同方法，包括：标准方法评分，Rasch分析评分，以及使用Massof创建的算法近似Rasch个人测量。此外，本研究还考察了Ryan等人编制的七项简式量表的分量表效度和使用情况。对50例低视力患者的NEI VFQ-25数据进行统计分析，采用Likert型总分加总平均值的标准方法，用WinSteps软件进行Rasch分析，用Excel中的Massof算法进行统计分析。计算各评分之间的相关性。计算Rasch人员分离信度和其他指标，以确定分量表和七项工具的效度。使用所有三种方法计算的分数高度相关，但标准计分方法发现了地板和天花板效应的证据。所有被调查的分量表都没有被证明是有效的。七项量表显示出可接受的人员分离信度和良好的目标性和项目绩效。尽管标准分数和Rasch分数高度相关，但Rasch分析具有消除下限和上限效应并产生区间标度数据的优势。在这组低视力患者中，近似Rasch人测量的Massof算法表现良好。应重新考虑VFQ-25分量表的效度。
The aim of this study was to evaluate different approaches to scoring the NEI VFQ-25 in patients with low vision including: scoring by the standard method, by Rasch analysis, and by use of an algorithm created by Massof to approximate Rasch person measure. Subscale validity and use of a seven-item short form instrument proposed by Ryan et al were also investigated. NEI VFQ-25 data from 50 patients with low vision were analyzed using the standard method of summing Likert-type scores and calculating an overall average, Rasch analysis using Winsteps software, and the Massof algorithm in Excel. Correlations between scores were calculated. Rasch person separation reliability and other indicators were calculated to determine the validity of the subscales and of the seven-item instrument. Scores calculated using all three methods were highly correlated, but evidence of floor and ceiling effects was found with the standard scoring method. None of the subscales investigated proved valid. The seven-item instrument showed acceptable person separation reliability and good targeting and item performance. Though standard scores and Rasch scores are highly correlated, Rasch analysis has the advantages of eliminating floor and ceiling effects and producing interval-scaled data. The Massof algorithm for approximation of the Rasch person measure performed well in this group of low vision patients. The validity of the subscales VFQ-25 should be reconsidered.