Objective To investigate the unidimensionality,reliability and validity of the Chinese version of the Low Vision Quality of Life Questionnaire (CLVQOL) on the basis of Rasch analysis.Methods All participants completed the CLVQOL.The psychometric properties of the CLVQOL were tested using Rasch analysis,including the unidimensionality,person separation index (PSI),person reliability (PR),infit mean square MNSQ and differential item functioning (DIF).Results One hundred and forty seven residents,including 58 males (39.46％) and 89 females (60.54％),were enrolled.The mean age of the participants was (67± 10) years old.The CLVQOL had 4 original scales.The first scale was found to be multidimensional and was subsequently divided into 2 scales.A new 5-scale CLVQOL was then developed,and all 5 scales were shown to be unidimensional.All PSIs exceeded 2,and all PRs exceeded 0.8,indicating the favorable discriminant ability of the questionnaire.Notable DIF was not found for any item across different age or gender subgroups.Conclusions A Rasch model can be used in improving the rating questionnaires for evaluating vision-related quality of life (VRQoL).All 25 items demonstrated an acceptable fit in Rasch analysis,and a new 5-scale CLVQOL was developed.%目的 探讨中文版低视力者生活质量量表的优化,使之能够更好地用于评估低视力者视功能相关的生活质量.方法 调查研究.于2014年1至12月收集符合纳入标准的上海市长宁区新泾镇社区居民作为本研究的调查对象,采集受试者的基本信息,采用Rasch模型分析对中文版低视力者生活质量量表的心理测量学特性进行测试,包括维度分析、个体分离指数、个体信度、项目功能差异等指标.结果 共147人纳入研究,其中男性58名(39.46％),女性89名(60.54％),年龄(67±10)岁.原中文版低视力者生活质量量表4个维度中,第一维度“远视力、移动和光感”有73.4％的变异,其中未被解释的部分有7.3％被第一对照所解释,特征根为3.3(＞2.0),不具备一维性,将之分为2个维度.新的中文版低视力者生活质量量表具有良好的一维性.个体分离指数均大于2,个体信度均大于0.8,说明量表在区分受试者能力方面较为敏感.不同年龄和性别亚组间不存在显著的项目功能差异.结论 Rasch模型分析可用于优化中文版低视力者生活质量量表,并构建了新的5维量表.
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