Evaluation of the NEI visual functioning questionnaire as an interval measure of visual ability in low vision
Evaluation of the NEI visual functioning questionnaire as an interval measure of visual ability in low vision
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DOI：
10.1016/s0042-6989(00)00249-2
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发表时间：
2001-01-01
期刊：
影响因子：
1.8
通讯作者：
Fletcher, DC
中科院分区：
文献类型：
--
作者：
Massof, RW;Fletcher, DC
美国国家眼科研究所开发了视觉功能问卷 (NEI-VFQ)，旨在评估视力障碍患者的健康相关生活质量。 NEI-VFQ 的开发人员将原始 52 个项目分配到 13 个不同的域中。推荐的 NEI-VFQ 评分方法是将每个领域内每个项目的顺序评分总和进行线性转换，以产生 13 个分数。这种评分方法的主要缺点是序数之和不一定生成有效的测量尺度。然而，Rasch 模型可用于根据对项目的有序响应来估计区间测量尺度。我们对 341 名低视力患者实施了 52 项 NEI-VFQ 中的 27 项。拉希分析用于估计每个项目针对特定反应（项目测量）所需的“视觉能力”，从而估计每个患者的“视觉能力”（个人测量）。通过检查项目和个人测量的残差分布来评估模型的有效性。我们观察到，我们从 NEI-VFQ 中测试的 17 个需要难度评级的项目为低视力患者提供了有效的区间量表。估计的人视觉能力测量值与 log MAR 敏锐度呈线性关系。需要频率或一致性评级水平的十个项目不能一起产生有效的区间量表。相反，这些项目似乎与患者样本中分布的其他变量（例如心理状态）混淆。根据 17 个 NEI-VFQ 项目估计的视觉能力量表与根据两项早期研究估计的视觉能力量表成正比，这两项研究也引出了低视力患者的难度评级。 (C) 2001 Elsevier Science Ltd. 保留所有权利。
The National Eye Institute developed a visual functioning questionnaire (NEI-VFQ) designed to assess health-related quality of life of patients with visual impairments. The developers of the NEI-VFQ distributed the original 52 items into 13 different domains. The recommended method for scoring the NEI-VFQ is to linearly transform the sum of the ordinal ratings to each item within each domain to produce 13 scores. The major shortcoming of this scoring method is that sums of ordinal numbers do not necessarily generate valid measurement scales. However, Rasch models can be used to estimate interval measurement scales from ordinal responses to items. We administered 27 items from the 52-item NEI-VFQ to 341 patients with low vision. Rasch analysis was used to estimate the 'visual ability' required by each item for a particular response (item measures) acid to estimate the 'visual ability' of each patient (person measures). The validity of the model was evaluated by examining the distributions of residuals for item and person measures. We observed that the 17 items we tested from the NEI-VFQ that require difficulty ratings produce a valid interval scale for low-vision patients. The estimated person measures of visual ability are linear with log MAR acuity. The ten items that require frequency or level of agreement ratings do not work together to produce a valid interval scale. Rather, these items appear to be confounded by other variables distributed in the patient sample (e.g. psychological state). The visual ability scale estimated from the 17 NEI-VFQ items is proportional to the visual ability scales estimated from two earlier studies that also elicited difficulty ratings from low-vision patients. (C) 2001 Elsevier Science Ltd. All rights reserved.