低视力独立测量量表（LVIM）的测量效度
Measurement Validity of the Low Vision Independence Measure (LVIM).
作者信息
Smith Theresa M, Krishnan Shilpa, Hong Ickpyo, Reistetter Timothy A
机构信息
Theresa M. Smith, PhD, OTR, CLVT, is Associate Professor, School of Occupational Therapy, Texas Woman's University, Houston;
出版信息
Am J Occup Ther. 2019 May/Jun;73(3):7303205070p1-7303205070p11. doi: 10.5014/ajot.2019.031070.
OBJECTIVE
This study's objective was to test the psychometrics of Smith's (2013) Low Vision Independence Measure (LVIM) using the Rasch model.
METHOD
A cohort design was used with 93 participants receiving occupational therapy for low vision. Confirmatory factor analysis (CFA) with a parceling approach was used to test the LVIM factors and Rasch analysis to examine item-level psychometrics.
RESULTS
Participants' average age was 78.9 yr (standard deviation = 12.1), and the majority were female (72.8%) with macular degeneration (62.3%). The CFA revealed two measurement factors: visual field or scotoma (n = 28) and visual acuity (n = 24). We removed six misfitting items, and the two factors of the revised LVIM demonstrated good rating scale function, good internal consistency (person reliability: visual field, .87; visual acuity, .90), good precision (person strata: visual field, 3.91; visual acuity, 4.40), no ceiling or floor effects, and no differential item functioning.
CONCLUSION
The revised LVIM demonstrates good psychometrics on the Rasch model and can be used as a valid outcome measure in low vision rehabilitation.
目的
本研究旨在使用拉施模型检验史密斯（2013年）的低视力独立测量量表（LVIM）的心理测量学特性。
方法
采用队列设计，93名接受低视力职业治疗的参与者纳入研究。使用带有分组方法的验证性因素分析（CFA）来检验LVIM因素，并使用拉施分析来检查项目层面的心理测量学特性。
结果
参与者的平均年龄为78.9岁（标准差 = 12.1），大多数为女性（72.8%），患有黄斑变性（62.3%）。CFA揭示了两个测量因素：视野或暗点（n = 28）和视力（n = 24）。我们剔除了6个拟合不佳的项目，修订后的LVIM的两个因素表现出良好的量表功能、良好的内部一致性（个人信度：视野，0.87；视力，0.90）、良好的精度（个人分层：视野，3.91；视力，4.40），没有天花板效应或地板效应，也没有项目功能差异。
结论
修订后的LVIM在拉施模型上表现出良好的心理测量学特性，可作为低视力康复中的有效结局测量指标。
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