Department of Learning, Informatics, Management and Ethics, Karolinska Institutet, SE-171 77, Solna, Sweden.
Department of Global Health and Department of Psychiatry and Behavioral Sciences, Harborview Medical Center, University of Washington, 325 9th Ave, UW Campus Mailbox Number 359931, Seattle, WA, 98104, USA.
Qual Life Res. 2018 Jun;27(6):1647-1659. doi: 10.1007/s11136-018-1841-4. Epub 2018 Mar 24.
To examine whether items in Berger's HIV Stigma Scale function differently with persons of different age, gender, and cultural backgrounds.
Secondary data from cohorts, collected in South India (n = 250), Sweden (n = 193), and the US (n = 603) were reanalyzed to evaluate DIF within, between, and across these cohorts. All participants had answered the revised version of the HIV stigma scale consisting of 32 items forming the subscales Personalized stigma, Disclosure concerns, Concerns about public attitudes, and Negative self-image. Differential Item Functioning (DIF) for these items was assessed using hybrid ordinal regression-IRT technique. When DIF was detected, the cumulative impact of DIF on individual subscale scores was evaluated.
DIF was detected for 9 items within, between, or across cohorts, but the DIF was negligible in general. Detected DIF between the Swedish and Indian cohorts had a cumulative salient impact on individual scores for the subscale Disclosure Concerns; Disclosure concerns were overestimated in the Swedish cohort and both over- and underestimated in the Indian cohort.
The items in the 32-item version of the HIV stigma scale did not seem to be particularly prone to present DIF. The DIF between the Indian and Swedish cohort for items in the subscale Disclosure Concerns could, however, result in both type I and type II errors if scores should be compared between the Indian and Swedish cohort.
探讨 Berger 艾滋病污名量表中的条目是否因年龄、性别和文化背景不同而具有不同的功能。
重新分析了在印度南部（n=250）、瑞典（n=193）和美国（n=603）收集的队列的二级数据，以评估这些队列内部、队列之间以及跨队列的差异功能。所有参与者都回答了经过修订的艾滋病污名量表，该量表由 32 个条目组成，分为个人污名、披露顾虑、公众态度顾虑和负面自我形象四个子量表。使用混合有序回归-IRT 技术评估这些项目的差异功能（DIF）。当检测到 DIF 时，评估 DIF 对个体子量表分数的累积影响。
在队列内部、队列之间或跨队列检测到 9 个项目的 DIF，但总体上 DIF 可忽略不计。在瑞典和印度队列之间检测到的 DIF 对披露顾虑子量表的个体分数有累积显著影响；在瑞典队列中，披露顾虑被高估，而在印度队列中则被高估和低估。
艾滋病污名量表 32 条目版本中的条目似乎不太容易出现差异功能。然而，印度和瑞典队列之间在披露顾虑子量表项目中的 DIF 可能会导致在印度和瑞典队列之间比较分数时出现 I 型和 II 型错误。
