Differential item functioning (DIF) of SF-12 and Q-LES-Q-SF items among french substance users.
Differential item functioning (DIF) of SF-12 and Q-LES-Q-SF items among french substance users.
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DOI：
10.1186/s12955-015-0365-7
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发表时间：
2015-10-24
影响因子：
3.6
通讯作者：
Baumann C
中科院分区：
文献类型：
--
作者：
Bourion-Bédès S;Schwan R;Laprevote V;Bédès A;Bonnet JL;Baumann C
研究差异项目功能（DIF），以确保每个项目都显示一致的反应模式，而无论受访者的特征如何。评估DIF有助于了解工具的性质，评估措施的质量和解释结果。本研究旨在探讨生活质量享受与满意度量表简表（Q-LES-Q-SF）与简明生活质量量表（SF-12）是否具有差异性。共有124名被诊断为物质依赖的门诊患者参加了一项横断面多中心研究。除了Q-LES-Q-SF和SF-12结果外，还收集了人口统计学数据，如年龄、性别、物质依赖类型和教育水平。进行Rasch分析（使用RUMM 2020软件）以评估Q-LES-Q-SF和SF-12项目的DIF。在SF-12的12个项目中，2个项目中发现了显著的年龄相关的均匀DIF，1个项目中发现了性别相关的DIF。SF-12中所有观察到的DIF效应均存在于心理健康项目中。Q-LES-Q-SF中有3个项目显示DIF;然而，SF-12中DIF项目对两组之间自我报告健康状况比较的delta评分计算的影响极小，Q-LES-Q-SF中DIF项目的影响较小。这些结果表明，没有重大的测量偏差影响使用Q-LES-Q-SF或SF-12评估的自我报告的健康状况的有效性。因此，这些问卷在很大程度上是对药物使用者自我报告的健康状况的有力衡量。
Differential Item Functioning (DIF) is investigated to ensure that each item displays a consistent pattern of responses irrespective of the characteristics of the respondents. Assessing DIF helps to understand the nature of instruments, to assess the quality of a measure and to interpret results. This study aimed to examine whether the items of the Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form (Q-LES-Q-SF) and Short-Form 12 (SF-12) exhibit DIF. A total of 124 outpatients diagnosed with substance dependence participated in a cross-sectional, multicenter study. In addition to the Q-LES-Q-SF and SF-12 results, demographic data such as age, sex, type of substance dependence and education level were collected. Rasch analysis was conducted (using RUMM2020 software) to assess DIF of the Q-LES-Q-SF and SF-12 items. For SF-12, significant age-related uniform DIF was found in two of the 12 items, and sex-related DIF was found in one of the 12 items. All of the observed DIF effects in SF-12 were found among the mental health items. Three items showed DIF on the Q-LES-Q-SF; however, the impact of DIF item on the delta score calculation for the comparisons of self-reported health status between the groups was minimal in the SF-12 and small in the Q-LES-Q-SF. These results indicated that no major measurement bias affects the validity of the self-reported health status assessed using the Q-LES-Q-SF or SF-12. Thus, these questionnaires are largely robust measures of self-reported health status among substance users.