Jafari Peyman, Bagheri Zahra, Hashemi Seyyedeh Zahra, Shalileh Keivan
Department of Biostatistics, Shiraz University of Medical Sciences, Shiraz.
Glob J Health Sci. 2013 Jun 6;5(5):80-8. doi: 10.5539/gjhs.v5n5p80.
Limited studies have examined the effect of differential item functioning (DIF) on comparing health related quality of life (HRQoL) scores across child self-reports and parent proxy-reports. This study aims to determine whether parents and children respond differently to the items in the Persian version of the PedsQoLTM 4.0 measure. The PedsQLTM 4.0 Generic Core Scales was completed by 938 child-parent dyads. The graded response model (GRM) was used to detect DIF between parents and children. The IRT analyses were conducted using IRTPRO 2.1.On the whole, our findings showed that 50% (4 out of 8) of the items in the physical subscale and 40% (2 out of 5) in both emotional and school subscales were flagged with DIF. Among the DIF items, 62.5% (5 out of 8) were uniform and the remaining 37.5% (3 out of 8) were non-uniform. Parents and children interpret certain items of the PedsQLTM 4.0 in a different ways, except for the social subscale. Hence, we should be cautious about using parent proxy-report as a substitute for a child's ratings.
仅有有限的研究考察了差异项目功能（DIF）对比较儿童自我报告和家长代理报告中的健康相关生活质量（HRQoL）得分的影响。本研究旨在确定家长和儿童对波斯语版儿童生活质量量表（PedsQoLTM）4.0中的项目回答是否存在差异。938对儿童-家长完成了儿童生活质量量表（PedsQLTM）4.0通用核心量表的填写。采用等级反应模型（GRM）检测家长和儿童之间的DIF。使用IRTPRO 2.1进行项目反应理论（IRT）分析。总体而言，我们的研究结果表明，身体领域分量表中50%（8项中的4项）的项目以及情感和学校领域分量表中40%（5项中的2项）的项目被标记为存在DIF。在存在DIF的项目中，62.5%（8项中的5项）为一致性DIF，其余37.5%（8项中的3项）为非一致性DIF。除社会领域分量表外，家长和儿童对儿童生活质量量表（PedsQLTM）4.0的某些项目理解不同。因此，我们在使用家长代理报告替代儿童自评时应谨慎。
