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Assessment of Differential Item Functioning for Demographic Comparisons in the MOS SF-36 Health Survey

机译：MOS SF-36健康状况调查中用于人口统计比较的差异项功能评估

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摘要

Objective: To investigate whether items of the Medical Outcomes Study (MOS) 36-Item Short-Form Health Status Survey (SF-36) exhibited differential item functioning (DIF) with respect to age, education, race, and gender. Methods: The data for this study come from two large national datasets, the MOS and the 1990 National Survey of Functional Health Status (NSFHS). We used logistic regression to identify items exhibiting DIF. Results: We found DIF to be most problematic for age comparisons. Items flagged for age DIF were vigorous activities, bend/kneel/stoop, bathing or dressing, limited in kind of work, health in general, get sick easier than others, expect health to get worse, felt calm and peaceful, and all four vitality items. Items flagged for education DIF include vigorous activities, health in general, health is excellent, felt calm and peaceful, and been a happy person. Vigorous activities, walk more than a mile, health in general, and expect health to get worse were identified as DIF when comparing African-Americans with whites. No items were identified for gender DIF. Conclusions: We found several consistent patterns of DIF using two national datasets with different population characteristics. In the current study, the effect of DIF rarely transferred to the scale level. Further research is needed to corroborate these results and determine qualitatively why DIF may occur for these specific items.
机译：目的：调查医学结果研究（MOS）的36项简短健康状况调查（SF-36）的项目在年龄，教育程度，种族和性别方面是否表现出不同的项目功能（DIF）。方法：本研究的数据来自两个大型国家数据集，即MOS和1990年国家功能性健康状况调查（NSFHS）。我们使用逻辑回归来确定具有DIF的项目。结果：我们发现DIF对​​于年龄比较而言最成问题。标记为DIF年龄的项目包括剧烈运动，弯腰/跪下/弯腰，洗澡或穿衣，工作受限，总体健康，生病比其他人容易，期望健康状况变得更糟，感到平静与和平以及所有四个生命力项目。教育DIF标记的项目包括剧烈活动，总体健康，健康状况极佳，感到平静与和平并成为快乐的人。将非裔美国人与白人进行比较时，剧烈活动，步行超过一英里，总体健康并且期望健康会恶化被确定为DIF。未找到性别DIF的项目。结论：使用两个具有不同人口特征的国家数据集，我们发现了DIF的几种一致模式。在当前的研究中，DIF的影响很少转移到规模水平。需要进一步的研究以证实这些结果并定性确定为什么这些特定项目可能会发生DIF。

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