Impact of differential item functioning on age and gender differences in functional disability
Impact of differential item functioning on age and gender differences in functional disability
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DOI：
10.1093/geronb/57.5.s275
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发表时间：
2002-09-01
影响因子：
6.2
通讯作者：
Altman, BM
中科院分区：
文献类型：
--
作者：
Fleishman, JA;Spector, WD;Altman, BM
目的：如果项目表现出项目功能差异（DIF），则功能障碍的组间差异估计可能存在偏倚。对于给定的项目。如果不同群体中的人根据其残疾程度作出答复的可能性不同，则存在家庭综合发展系统。本研究探讨了DIF在多大程度上影响估计的年龄和性别组的残疾严重程度的差异，成人与一些功能性disability. Methods。数据来自1994/1995年全国健康访谈调查残疾补助金。分析的重点是5,750名成年受访者，他们接受了11项日常生活活动/日常生活任务工具活动中至少一项的帮助或监督。我们使用多指标/多原因模型估计了残疾的性别和年龄组（18-39岁、40-69岁和70岁以上）差异，该模型将功能残疾视为潜在特征。有9个项目在年龄或性别上表现出显著的DIF，其中“购物”和“理财”的DIF最大。“在不调整DIF的情况下，中年人的残疾程度低于老年男子，妇女的残疾程度低于非老年人中的男子。调整DIF后，中年人与老年人没有差异，年龄组内的性别差异也不显著。不同社会人口群体的残疾情况比较需要考虑到家庭综合发展系统。未来的研究应该检查DIF的原因，并开发替代问题的措辞，减少DIF的影响。
Objectives, Estimates of group differences in functional disability may be biased if items exhibit differential item functioning (DIF). For a given item. DIF exists if persons in different groups do not have the same probability of responding, given their level of disability. This Study examines the extent to which DIF affects estimates of age and gender group differences in disability severity among adults with some functional disability.Methods. Data came from the 1994/1995 National Health Interview Survey Disability Supplement. Analyses focused on 5,750 adult respondents who received help or supervision with at least one of 11 activities of daily living/instrumental activities of daily living tasks. We estimated gender and age group (18-39, 40-69, and 70+) differences in disability, using multiple-indicator/multiple-cause models, which treat functional disability as a latent trait.Results. Nine items manifested significant DIF by age or gender DIF was especially large for "shopping" and "money management." Without adjusting for DIF, middle-aged persons were less disabled than elderly men, and women were less disabled than men among nonelderly persons. After adjusting for DIF, middle-aged persons did not differ from elderly persons, and gender differences within age groups were not significant.Discussion. Comparisons of disability across sociodemographic groups need to take DIF into account. Future research Should examine the causes of DIF and develop alternative question wordings that reduce DIF effects.